A particle moves according to the equation x = 9t2, where x is in meters and t is in seconds. (a) find the average velocity for the time interval from 2.10 s to 2.85 s.

Answer

Resistivity R = K * L / A    where resistivity is constant for material, L the length of the material and A the area of the material

K = R * A / L     where R is the resistance of the material

Answer:

the first amendment

Explanation:

the first amendment to the United States constitution allows the freedoms concerning religion, expression, assembly, and the right to gather and petition.

Answer:

His initial velocity (speed) must be 64.16 m/s.

Explanation:

Horizontal Motion

When an object is horizontally launched at a speed v from a height h, the maximum horizontal distance (also called Range) traveled by the object can be calculated as follows:

\(\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}\)

Our daredevil is attempting to clear a river d=420 m wide with his motorcycle from a cliff h=210 m high. We need to find the speed needed to safely reach the opposite edge of the river.

From the above equation, we solve for v:

Speed:

\(\displaystyle v=d\cdot\sqrt{\frac {g}{2h}}\)

\(\displaystyle v=420\cdot\sqrt{\frac {9.8}{2\cdot 210}}\)

\(\displaystyle v=420\cdot\sqrt{\frac {9.8}{420}}\)

v = 64.16 m/s

His initial velocity (speed) must be 64.16 m/s.

The period of a wave is the time it takes for one complete wave to pass a fixed point. We are given that 4 complete waves pass a fixed point in 10 seconds.

To find the period, we can divide the total time by the number of complete waves:  10 seconds ÷ 4 waves = 2.5 seconds per wave


To determine the period of a water wave, we need to know how much time it takes for one complete wave to pass a fixed point. In this case, 4 complete waves pass in 10 seconds.

Step 1: Find the time it takes for one complete wave to pass.
Divide the total time (10 seconds) by the number of complete waves (4 waves).

10 seconds / 4 waves = 2.5 seconds

Step 2: Identify the corresponding answer choice.
The period of the water wave is 2.5 seconds, which corresponds to answer choice C.

Your answer: C: 2.5 s

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Answer:

stored

Explanation:

P. E . = m g h  

   represents STORED energy in the form of the height * acceleration of gravity * mass

We need to use the formula: Force = Mass × Acceleration Let's use the given values to calculate the force exerted on the deer when it is hit by the car. The car weighs 235 lb and it is traveling north at 75 mph. The deer weighs 150 lb and it is going 35 mph east. Force = 44045 lbSince the force is a vector quantity, it has both magnitude and direction.

Step 1: Convert the velocities into feet per second.1 mile = 5280 feet1 hour = 3600 seconds So, the velocity of the car is:75 mph = (75 × 5280) ÷ 3600 = 110 feet/secondThe velocity of the deer is:35 mph = (35 × 5280) ÷ 3600 = 51.3 feet/second

Step 2: Find the components of velocity of the deer. The velocity of the deer is in the east direction, so we need to find its horizontal component, vx, and its vertical component, vy. If the angle between the deer's velocity and the x-axis is θ, then: vx = v × cosθandvy = v × sinθv = 51.3 feet/secondθ = 90° - arctan(0 / 110) = 90°So,vx = 51.3 × cos90° = 0 feet/second vy = 51.3 × sin90° = 51.3 feet/second

Step 3: Find the net velocities of the car and the deer. Since the car is moving north and the deer is moving east, the net velocity of the car and deer together can be found using the Pythagorean theorem. Net velocity = √[(vx + 110)² + vy²]Net velocity = √[(0 + 110)² + (51.3)²]Net velocity = √(12100 + 2631.69)Net velocity = √14731.69Net velocity = 121.3 feet/second

Step 4: Find the net momentum of the car and the deer. Net momentum = (mass of car × velocity of car) + (mass of deer × velocity of deer)Net momentum = (235 × 110) + (150 × 121.3)Net momentum = 25850 + 18195Net momentum = 44045 lb ft/second

Step 5: Find the force exerted on the deer. Force = Net momentum ÷ time Here, time is the duration of the collision which is not given in the problem. We will assume it to be 1 second. Force = 44045 ÷ 1

Force = 44045 lb Since the force is a vector quantity, it has both magnitude and direction. The direction of force is along the line of impact which is not given in the problem.

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Answer: 18 m/s/s

Explanation:

3 times 6 equals 18 and 3 seconds every second makes this equation

The equation Jerry should use for the total resistance in a series circuit is R = R₁ + R₂ + R₃.

option A.

In a series circuit, all components are connected end-to-end, forming a single path for current flow.

A series circuit can contain any combination of resistors, capacitors, and inductors.

In a series circuit, the current flowing in each circuit component is the same  and the voltage drop in each circuit component is different.

Based on this, the total formula for the total resistance in a series circuit is given as;

R = R₁ + R₂ + R₃

where;

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Answer:

2850000J

Explanation:

Given parameters:

Weight of diver = 950N

Altitude  = 3000N

Unknown:

Total work done by the sky diver = ?

Solution:

To solve this problem, we use the expression:

        Work done  = Weight x height

Now insert the parameters:

        Work done  = 950 x 3000  = 2850000J

Answer:

3)No, it's speed is constant.

Time taken by the car to travel 300 miles is 4.615 hours.

The speed of any moving object is the ratio of the distance traveled and the time taken to cover that distance.

Given is the distance d = 300 miles and the speed s = 65 miles/hour, then the time taken t will be

s=d/t

65 = 300/t

t= 4.615 hours

Thus, time taken by the car to travel 300 miles is 4.615 hours.

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The heat required would be 658.24 kJ.

Q = mL, where Q = heat required to change the state of matter, m = mass of substance, L = specific latent heat of fusion of substance. For water, the specific latent heat of fusion is 334 kJ/kg. Therefore, Q = 1.96 kg × 334 kJ/kg = 658.24 kJ. This means that 658.24 kJ of heat must be removed from 1.96 kg of water at 0°C to make ice cubes at 0°C.

To make ice cubes from water, the heat must be removed. This is because of the latent heat of fusion. The latent heat of fusion is the amount of energy needed to change a solid to a liquid or vice versa without a temperature change. So, when water is cooled from 0°C to 0°C, the energy needs to be removed to allow the water to freeze. The energy required is the product of the specific latent heat of the fusion of water and the mass of water.The latent heat of fusion is a characteristic property of a substance.

For water, the specific latent heat of fusion is 334 kJ/kg. Therefore, to make ice cubes, 334 kJ of heat needs to be removed from every kilogram of water. For 1.96 kg of water, the heat required would be 1.96 kg × 334 kJ/kg = 658.24 kJ.

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ANSWER

EXPLANATION

Parameters given:

Speed of electron, v = 4.10 * 10^3 m/s

Magnetic field, B = 1.45 T

Magnetic force, F = 1.40 * 10^(-16) N

To find the angle that the velocity of the electron makes with the magnetic field, apply the formula for magnetic force:

where θ = angle

q = electric charge = 1.6 * 10^(-19) C

Make θ the subject of the formula:

Therefore, the angle that the velocity makes is:

To find the second angle, subtract the angle from 180 degrees:

The angles are:

Answer:

the temperature in the troposphere decreases while the temperature in the stratosphere increases because of the density of air molecules.

Explanation:

sorry ima little late

First, compare two balls from the heavier group to Group A. There must be two weighings; lower bound because there are three options per weighing.

a) Follow these steps to determine which ball is heavier in just two weighings:

1. nine balls should be divided into three groups of three balls each—Group A, Group B, and Group C.

2. Using the balanced scale, weigh Group A in comparison to Group B:

3. Using just two weighings, you can determine which ball is heavier by following these steps.

4.  Compare those two balls to one another:

Using just two weighings, you can determine which ball is heavier by following these steps.

(b) The decision tree lower bound demonstrates that fewer than two weighings are required to identify the defective ball. This is due to the fact that there are nine balls, and each one can only tell you how much each group weighs. We can only reduce the number of possibilities by a factor of three with each weighing.

We would need to compare all possible ball combinations, which would require more than two weighings, in order to distinguish between all nine balls in a single weigh. Therefore, the minimum required to determine which of the nine balls with identical appearances is the heavier is two weighings.

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0.54 m is the distance the bullet travels inside the wall when  3.0 g bullet is fired at a speed of 300 m/s.

m=3 g = 0.003 kg

initial velocity= 300m/s

F=240 N

\(v_f^2=v_i^2-2as\)

\({:[s=(v_i^2/2a],[s=300^2/2*83.33 *10^3,[= > s=0.54m]\)

Speed (often abbreviated as "s") is a scalar variable that describes how much an object's location changes over time or how much it changes per unit of time. The average speed of an item in a period of time is the distance traveled by the object divided by the duration of the period.

Time divided by distance are the speed-related metrics.. The metre per second (m/s) is the SI unit of speed, while the kilometer per hour (kph) is the most often used unit of speed in daily life.

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The color of flames that represents the hottest temperature emitted from a star is (d) Blue.

Blue flames are associated with the highest temperatures. In the context of stars, the color of a star's light is related to its surface temperature. The hottest stars, such as blue supergiants or blue-white stars, emit a significant amount of blue light due to their high temperatures.

As the temperature decreases, stars emit light in different colors, progressing from blue to white, yellow, orange, and finally red, with cooler stars emitting predominantly red light.

Therefore, if we consider the color of flames as an analogy, blue flames would correspond to the hottest temperature emitted from a star.

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Answer:

.3m

Explanation:

Apex

0.3 is right i just got it right on the test for A P E X :D

c                                                            

Explanation: c because you said it lol

Answer:

c

Explanation:

Answer:

Yes, the driver has traveled far enough to reach the office.

Explanation:

Starting at 50 km/h you can break the 50 into 4 sections (50/4 or 1/4 of 50) and that will get you 12.5

45 minutes are 3/4 of an hour which is 50 km/h.

12.5*3=37.5 km (37.5>30)

Answer:

2730.304 KJ

Explanation:

 How much heat is required to convert 0.8 kg of ice at  -35°C into steam at 100 C?

Given that:

mass of ice (m) = 0.8 kg = 800 g

Initial temperature (\(T_i\)) = -35°C = 238 K

final temperature (\(T_n\))= 100°C = 373 K

Specific heat of ice (\(S_i\)) = 2.108 J/g.K

Specific heat of water (\(S_w\)) = 4.18 J/g.K

Latent heat of fusion (\(L_f\)) = 334 J/g.

Latent heat of vaporization (\(L_v\)) = 2230 J/g.

\(\Delta T=T_n-T_i=373-238=135K\)

Total heat (Q) required to increase the temperature of ice from the initial temperature of 238K to final temperature of 373 K is given by the equation:

\(Q=m\Delta TS_i+m\Delta TS_w+mL_f+mL_v\\Q=800(135)*2.108+800(135)*4.18+800*334+800*2230\\Q=227664+451440+267200+1784000=2730304J\\Q=2703.304KJ\)

Answer:

All planets have an elliptical orbit

all planets have roughly the same SHAPE of orbit

The change in temperature in kelvin, given that the system was heated from 5 °C to 10 °C is 278 K

We'll begin by obtaining the change in temperature in degree Celsius. This can be obtained as follow:

ΔT = T₂ – T₁

ΔT = 10 – 5

ΔT = 5 °C

Finally, we shall convert 5 °C to unit in kelvin. This can be obtained as follow:

T(K) = T(°C) + 273

T(K) = 5 + 273

T(K) = 278 K

Thus, from the above calculation, we can conclude that the change in temperature is 278 K

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Answer:

1 mole of every substance has 6.022 × 10^23 particles. This is called Avagadro's constant

From the above information provided, the blood type of the individual is O- (O negative) which is found   by the reactions of the blood sample with the different antibodies:

Anti-A serum: No reaction

Anti-B serum: No reaction

Anti-Rh serum: No reaction

The individual do not have the A, B, or Rh antigens on their red blood cells, that is corresponding  to blood type O-.

Rh antigens, also called Rhesus antigens, are  described as transmembrane proteins expressed at the surface of erythrocytes and they appear to be used for the transport of CO2 and/or ammonia across the plasma membrane.

In conclusion, the main Rh antigens on red cells – C, c, D, E, e of which the  most important of these is the Rh D.

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Answer:

C

Explanation:

Earth Mars Jupiter Saturn,Uranus, naptune

When a body is positively charged, it implies that there is positive as well as negative charge in the body but the positive charge is more than negative charge.

Most of the materials that make up our world are composed of atoms, which are made up of a nucleus containing protons and neutrons surrounded by electrons. When an atom loses or gains electrons, it becomes positively or negatively charged, respectively. This is because the number of protons in an atom, which determines its atomic number and chemical properties, does not change.

When there are more protons than electrons, the atom becomes positively charged, and when there are more electrons than protons, it becomes negatively charged.Positive charge is the property of a material that has lost one or more electrons and therefore has more protons than electrons. Positive charges repel other positive charges, while negative charges attract positive charges.

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Answer:

Explanation: Thermal energy is transferred through water by conduction, convection, and radiation. Conduction occurs when heat is transferred through direct contact between water molecules with different thermal energy. Convection occurs when warmer water rises to the top and cooler water sinks to the bottom, creating a circular motion that distributes heat. Radiation is the transfer of energy through electromagnetic waves, but it is not significant in water due to poor conduction. The specific mechanism that dominates heat transfer depends on various factors such as temperature gradient, depth, and presence of other materials.

Answer:

6500g

Explanation:

7000 - 500 = 6500

The mass of paint will be "6500 g".

Given:

Total mass,

Volume,

Mass of empty tin,

Now,

The mass of paint will be:

= Total mass - Mass of empty tin

By putting the values, we get

= \(7000-500\)

= \(6500 \ g\)

Thus the approach above is correct.

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