How much work is required for an 80kg firefighter to run up 21.5m in 60s?
Answers
Answer:
To calculate the amount of work required for an 80kg firefighter to run up a 21.5m in 60s, we first need to determine the force required to lift the firefighter up the 21.5m. Because the firefighter is running, we can assume that their body is moving at a constant speed, so the force required to lift them is equal to their weight, or 80kg.
Next, we need to calculate the distance over which the force is applied. In this case, the firefighter is running up a 21.5m flight of stairs, so the distance is 21.5m.
Finally, we need to determine the time over which the force is applied. In this case, the firefighter runs up the stairs in 60s, so the time is 60s.
To calculate the amount of work required, we use the formula W = F * d, where W is the work, F is the force, and d is the distance. Plugging in the values we determined above, we get:
W = 80kg * 21.5m = 1720kgm
Therefore, the amount of work required for the firefighter to run up the stairs in 60s is 1720kgm.
The amount of work required for the firefighter to run is 5.2 J.
What is meant by kinetic energy ?Kinetic energy is defined as the energy acquired by a body by virtue of its motion.
Here,
Mass of the firefighter, m = 80 kg
Distance to be covered by the firefighter, d = 21.5m
Time taken by the firefighter, t = 60 s
So, velocity of the firefighter,
v = d/t
v = 21.5/60
v = 0.36 m/s
The amount of work required for the firefighter to run is equal to his kinetic energy.
Therefore, kinetic energy of the firefighter,
KE = 1/2 mv²
KE = 1/2 x 80 x(0.36)²
KE = 5.2 J
Hence,
The amount of work required for the firefighter to run is 5.2 J.
To learn more about kinetic energy, click:
https://brainly.com/question/29251899
#SPJ2
Related Questions
What is the potential difference across a computer power supply with a resistance of 50 Ω, if the power supply draws a current of 2.2 A?
Answers
Given data:
* The current through the computer power supply is I = 2.2 A.
* The value of resistance is R = 50 ohm.
Solution:
According to Ohm's law, the voltage (potential difference) across the computer power supply is,
\(V=IR\)Substituting the known values,
\(\begin{gathered} V=2.2\times50 \\ V=110\text{ volts} \end{gathered}\)Thus, the potential difference across the computer supply is 110 volts.
Use the diagram of the rollercoaster below to answer the question. What is happening to the kinetic energy and the potential energy as the rollercoaster moves from point A to point B?
a. The kinetic energy decreases and the potential energy increases.
b. The kinetic energy increases and the potential energy increases.
c. The kinetic energy increases and the potential energy decreases.
d. The kinetic energy decreases and the potential energy decreases.
Answers
As the rollercoaster moves from point A to point B, the correct answer is option c: The kinetic energy increases and the potential energy decreases.
At point A, the rollercoaster is at its highest position, which corresponds to the maximum potential energy and minimum kinetic energy. As the rollercoaster moves downwards towards point B, it gains speed and its height decreases.
This results in a decrease in potential energy since the height is decreasing. At the same time, the rollercoaster's speed increases, leading to an increase in kinetic energy.
The conservation of energy principle states that the total mechanical energy (the sum of potential energy and kinetic energy) of a system remains constant in the absence of external forces.
In this case, as the rollercoaster moves from point A to point B, the decrease in potential energy is equal to the increase in kinetic energy, keeping the total mechanical energy constant.
Therefore, the correct answer is option c: The kinetic energy increases and the potential energy decreases.
Learn more about kinetic energy at: https://brainly.com/question/8101588
#SPJ11
PLEASE HELP ASAP WILL GIVE 10 PTS
Which item is made from a synthetic material?
A. cotton pants
B. leather jacket
C. tissue paper
D. wicker basket
Answers
Answer: A. Cotton Pants
Explanation:
Answer:
A
Explanation:
Da 6.0 kg wooden crate slides across a wooden floor
at a speed of 2.4 m/s, it it takes an applica force
of 25 N to keep it going at a steady speed. What is the
coe of kinetic friction between the floor and crate?
Answers
Answer:coe?
Explanation:
find the distance along an arc on the surface of the earth that subtends a central angle of 7 minutes (1 minute
Answers
The distance along an arc on the surface of the earth, with a central angle of 2 minutes (or 1/30 of a degree), is equal to 264,800 miles
What is earth?Earth is the third planet from the Sun and the fifth-largest planet in the Solar System. It is the only planet known to have an atmosphere containing free oxygen, oceans of liquid water on its surface, and, of course, life. Earth is the only planet in our Solar System not named after a Greek or Roman deity. Its solid outer surface is called the crust, and its molten interior is the mantle. It has many natural satellites, including the Moon, and its rotation and orbit around the Sun give way to the seasons, day and night, and the length of the year.
The distance along an arc is equal to the circumference of the circle times the central angle (in radians). The circumference of a circle is equal to 2πr, where r is the radius of the circle.
Therefore, the distance along an arc on the surface of the earth, with a central angle of 2 minutes (or 1/30 of a degree), is equal to:
(2π)(3960 miles)(1/30 degree) = 264,800 miles.
To learn more about earth
https://brainly.com/question/30253926
#SPJ4
Complete Question:
Find the distance along an arc on the surface of the earth that subtends a central angle of 2 minutes (1 minute = 1/60 degree). The radius of the earth is 3960 miles
How does Newton's third law of motion apply to how the planets move?
Answers
Calculate the weight of a book if it has a mass of 0. 6kg
Answers
Answer:
a) given that mass=0.6kg,distance of stretching from equilibrium position x=0.9m from new ton's second law,F=ma where a is acceleration of the body.Therefore,force on the spring -mass syste
Explanation:
hope it helps
The state of matter with particles that are not attracted or tightly packed
and are not arranged in a regular pattern; zoom around to easily change
shape and volume *
a.gas
b.liquid
c.solid
Answers
It's none of the above hope this helps
a fixed system of charges exerts a force of magnitude 9.0 n on a 3.0 c charge. the 3.0 c charge is replaced with a 4.0 c charge. what is the exact magnitude of the force (in n) exerted by the system of charges on the 4.0 c charge? do not include units with your answer.
Answers
The required magnitude of the force exerted by the system of charges on the 4 C charge is calculated to be 12 N.
Magnitude of force is given as 9 N.
Initial charge = 3 C
It is then replaced by 4 C.
The magnitude of the force exerted by the system of charges on the 4 C charge is to be calculated.
We know that, electric field is given by the formula, E = F/q
Placing the values,
E = F/q = 9/3 = 3 N/C.
Now, the charge is 4 C.
The electric field remains the same. Then,
F = 3 × 4 = 12 N
Thus, the exact magnitude of the force exerted by the system of charges on the 4 C charge is 12 N.
To know more about charge:
https://brainly.com/question/14643963
#SPJ4
in what direction is the force the branch exerts on the chimpanzee?
Answers
"The direction of force that the branch exerts on the chimpanzee is towards the ground.
The force of the branch on the chimpanzee is the gravitational force. It acts downwards on the chimpanzee, and hence the direction of the force is downwards towards the earth. Let's assume that the chimpanzee is hanging on a branch of a tree and is stationary. Then, the gravitational force, also known as the weight of the chimpanzee, acts downwards on the chimpanzee. The weight of the chimpanzee is equal to the mass of the chimpanzee multiplied by the acceleration due to gravity.The force exerted by the branch on the chimpanzee is an equal and opposite reaction to the force exerted by the chimpanzee on the branch, according to Newton's Third Law of Motion. Therefore, the direction of the force exerted by the branch on the chimpanzee is towards the ground.
To learn more about force
https://brainly.com/question/12785175
#SPJ11
the gravitational force exerted by the sun on the earth holds the earth in an orbit around the sun. let us assume that the orbit is perfectly circular. the work done by this gravitational force during a short time interval in which the earth moves through a displacement in its orbital path is:
Answers
The work done by this gravitational force during a short time interval in which the earth moves through a displacement in its orbital path is zero.
The work done by a force is given by the dot product of the force and the displacement. In this case, the gravitational force is acting inwards towards the center of the circle, and the displacement is in the direction tangent to the circle. Since these two directions are perpendicular, the dot product of the force and the displacement is zero.
This is because the force is always perpendicular to the displacement of the Earth, and so the angle between the force and the displacement is always 90 degrees, which makes the dot product of the force and the displacement equal to zero.
To know more about sun, here
brainly.com/question/13155551
#SPJ4
Resulting from past and current geoscience processes, Earth's mineral, energy, and groundwater resources are unevenly distributed. As humans continue to remove these limited and often non-renewable resources, their distributions significantly change. This map shows some of the world's major tectonic plate boundaries. Volcanic and hydrothermal activity occur as a result of the energy released along these boundaries, creating an ideal environment for the concentration of minerals. Which statement provides another rationale for higher mineral concentrations near plate boundaries compared other parts of the world? A) The speed of mineral formation is increased by the high levels of groundwater found at plate boundaries. B) Sediment from erosion usually deposits near plate boundaries, and volcanic activity causes it to form minerals. C) Rocks with high mineral concentrations buried deep in the mantle can be pushed near the surface as plates move. D) The magnetic pull of Earth's mantle is strongest at plate boundaries, pulling minerals in Earth's crust toward them.
Answers
Answer:
C
Explanation:
Rocks with high mineral concentrations buried deep in the mantle can be pushed near the surface as plates move
Statement provide another rationale for higher mineral concentrations near plate boundaries is rocks with high mineral concentrations buried deep in the mantle can be pushed near the surface as plates move.
What is mineral?A mineral is an inorganic element or compound that occurs in nature and has a recognizable chemical composition, crystal structure, and physical characteristics. Quartz, feldspar, mica, amphibole, olivine, and calcite are examples of common minerals.
A body of undifferentiated mineral materials or an amalgamation of one or more minerals is referred to as a rock. Granite, basalt, limestone, and sandstone are typical rocks.
The higher mineral concentrations near plate boundaries is rocks with high mineral concentrations buried deep in the mantle can be pushed near the surface as plates move.
To learn more about mineral refer to the link:
brainly.com/question/18078524
#SPJ2
An engine produces 240 KJ of energy in 2.0 minutes. What is the power output of the engine?
Answers
Power = Energy / Time
Where Power is measured in Watts, Energy is measured in Joules, and Time is measured in seconds.
First, we need to convert the energy from KJ to J, since the SI unit of energy is Joules. Therefore,
240 KJ = 240,000 J
Next, we need to convert the time from minutes to seconds. Therefore,
2.0 minutes = 2.0 x 60 seconds = 120 seconds
Now we can calculate the power output of the engine by plugging in the values:
Power = Energy / Time
Power = 240000 J / 120 s
Power = 2000 W
Therefore, the power output of the engine is 2000 W (or 2.0 kW).
during photosynthesis what energy is being transformed
Answers
Answer:
During photosynthesis the following energy are transformed:
1:Light energy
2:gas
3:water
A runner runs 400 metres in 1 minute 20 seconds. What is his speed in m/s
Answers
Answer:
5m/s
Explanation:
400m/ 20+60s
= 400/ 80 m/s
5 ms-1
An athlete walks 8 meters East , 2 meters South, 8 meters West, and finally 2 meters North. What is the total distance traveled?
Answers
Answer:
the sum of all the values which is 20 meters
Explanation:
total is everything combined
Distance is the sum of an object's movements, regardless of direction. The distance can be defined as the amount of space an object has covered, regardless of its starting or ending position. The total distance traveled is 20m.
A scalar quantity distance measures "how much ground an object has covered" while moving. The term "how far out of place an object is" relates to displacement, a vector number that describes the total change in the position of the object.
Distance is the length of an object's real route in its entirety. The International System of Units specifies that the unit of distance is the meter.
Total distance = 8 + 2 + 8 + 2
D = 20 m
To know more about Total distance, visit;
https://brainly.com/question/30283446
#SPJ7
A volume of 200.0 cm3 of water at a temperature of 4°C is in a container with a 1000-cm3 capacity. The container and its contents are heated to 95°C. What is the final volume of water in the container? Disregard any expansion of the container itself. βwater = 210 x 10-6 (°C)-1.
Answers
The final volume of water in the container after increasing the temperature is 203.8 m³.
From the given,
The initial volume of water (Vο) = 200 cm³
Initial temperature = 4°C = 4+273 = 277K
Final temperature = 95°C = 273+95 = 368 K
Volume expansion co-efficient = 210×10⁻⁶(°C)⁻¹
Final volume =?
β = 1/Vο (ΔV/ΔT), β represents the volume expansion coefficient, ΔV change in volume, ΔT is the change in temperature, and Vο is the initial volume.
ΔV = β×Vο×ΔT
= 210×10⁻⁶×200×(368-277)
= 210×10⁻⁶×200×91
ΔV = 3.83 m³
ΔV = final volume - initial volume
final volume = ΔV + 200
= 3.82 +200
= 203.82 m³
Final volume = 203.82 m³.
Thus, the final volume of the water is 203.82 m³.
To know more about the volume expansion coefficient:
https://brainly.com/question/31456049
#SPJ1
the event that marks the end of the main-sequence lifetime of a star is the
Answers
Question 81
The siting of nuclear facilities is subject to extensive regulation and licensing by the a. Federal health department
b. National environmental protection agency
c. Nuclear regulatory commission
d. Consumer product safety commission
Answers
The siting of nuclear facilities is subject to extensive regulation and licensing by the c. Nuclear Regulatory Commission.
The siting of nuclear facilities is subject to extensive regulation and licensing by the Nuclear Regulatory Commission to ensure the safety and protection of the public and the environment from potential nuclear hazards. The Nuclear Regulatory Commission regulates commercial nuclear power plants and other uses of nuclear material. The NRC licenses and regulates the Nation's civilian use of radioactive materials to protect public health and safety, promote common defense and security, and protect the environment.
Learn more about radioactive materials here: https://brainly.com/question/3542572
#SPJ11
Acceleration is the magnitude of average velocity true or false
Answers
Answer:
False
Explanation:
Please help it’s multiple choice
Answers
Explanation:
the answer is object with more mass have more kinetic energy
K/E=(1/2)mv²
it cant be the last option because it was stated in the question that the velocity is the same
how much heat, in kJ, must be transferred to 10 kg of air to increase the temperature from 10C to 230C if the pressure is maintained constant
Answers
To calculate the amount of heat required to increase the temperature of 10 kg of air from 10C to 230C at constant pressure, we can use the specific heat capacity of air which is 1.005 kJ/kgC. The temperature difference is 220C (230C - 10C).
Therefore, the amount of heat required can be calculated as:
Heat = mass x specific heat capacity x temperature difference
Heat = 10 kg x 1.005 kJ/kgC x 220C
Heat = 2,451 kJ
Therefore, 2,451 kJ of heat must be transferred to 10 kg of air to increase the temperature from 10C to 230C while maintaining constant pressure. It is important to note that this calculation assumes that the air is an ideal gas and that there is no phase change during the heating process.
For more information on ideal gas see:
https://brainly.com/question/31463642
#SPJ11
The number of degrees of arc that your location is north or south of the Earth's equator is called your:
A. meridian
B. declination
C. latitude
D. longitude
Answers
Explanation: your latitude is the number of degrees of arc you are away from the equator along your meridian. Latitudes are measured either north or south of the equator from 0 degrees to 90 degrees.
what happens to the ballon when you squeeze the bottle?
Answers
Answer:
When you squeeze a bottle that has a balloon attached to its opening, the pressure inside the bottle increases. This increased pressure will cause the air molecules inside the bottle to move closer together, which in turn will cause the balloon to inflate.
If you continue to squeeze the bottle, the pressure inside the bottle will continue to increase, and the balloon will continue to inflate. However, if you squeeze the bottle too hard, the balloon may burst due to the excess pressure.
When you release the pressure on the bottle, the air molecules inside the bottle will spread out again, causing the pressure to decrease. As a result, the balloon will deflate back to its original size.
Work Calculations
1. When doing a push up a student uses 700 N of force to lift his body a distance of 0.45m, how much work is done?
Answers
=================================================
W = work = unknown
F = force = 700 N
d = displacement = 0.45 m
----------
W = F*d
W = (700 N)*(0.45 m)
W = (700*0.45) Nm
W = 315 Nm
W = 315 J
---------------
notes:
Nm stands for "newton meters" and not "nanometers"1 joule = 1 newton meterA ball hits a wall horizontally at 6m/s and rebounces at 4.4m/s the ball is in contact with wall for 0.04 sec. what is the acceleration.
Answers
Answer:
Acceleration (a) = 40 m/s²
Explanation:
Given:
Initial velocity (u) = 6 m/s
Final velocity (v) = 4.4 m/s
Time taken (t) = 0.04sec
Find:
Acceleration (a) = ?
Computation:
We know that,
⇒ v = u + at
⇒ a = (v - u) / t
⇒ Acceleration (a) = (4.4 - 6) / 0.04
⇒ Acceleration (a) = (-1.6) / 0.04
Acceleration (a) = 40 m/s²
___________ force is a supportive force that surfaces exert in order to prevent solid objects from passing through one another.
A. Contact
B. Regular
C. Normal
D. Field
Answers
Normal force
the average temperature of mars is lower than that of earth. if a distant observer measures the infrared radiation from both mars and earth, then
Answers
If a distant observer measures the infrared radiation from both Mars and Earth, they would find that Earth emits more infrared radiation than Mars.
If a distant observer measures the infrared radiation from both Mars and Earth, they would observe that Mars emits less infrared radiation compared to Earth. This is because the average temperature of Mars is much lower than that of Earth, and objects with lower temperatures emit less infrared radiation. Therefore, the observer would detect more infrared radiation coming from Earth compared to Mars.
To know more about Infrared Radiations , click on this -
brainly.com/question/20779091
#SPJ11
A distant observer measuring the infrared radiation from both Mars and Earth would observe that Mars emits less infrared radiation than Earth, indicating a lower average temperature.
When the temperature of is about absolutely zero, all bodies emits infrared radiations. This amount of radiation highly depends on the temperature of the body.
As we assume this, Mars has a lower average temperature as compared to Earth, Mars emits less IR rays. Therefore, a distant observer measuring the infrared radiation from both planets would observe that Mars emits less radiation than Earth. Hence, this is the logic we are using to conclude that there is a lower temperature on Mars than Earth.
To know more about Infrared rays, visit,
https://brainly.com/question/29796311
#SPJ4
A student is given a sample of matter and asked to determine whether it is an element.
Answers
Factor the expression 27x-18y
Answers
Answer:
9(3x-2y)
Explanation:
27x-18y, the common factor here is 9
9(3x-2y)