A 3000 kg truck travelling at 50km/hr strikes a stationary 1000 kg car, locking the two vehicles
together. What is the final velocity of the two vehicles?
(Please show work)

Answer:

x= 100 m

Explanation:

m= 600 kg

t= 10 s

F= 1200N

v0= 0

-----

F=ma

a=F/m

x= (v0)t + (1/2)(a)(t^2)

x= (1/2)(F/m)(t^2)

x= (1/2)(1200/600)(10^2)

x= 100m

Answer:

A, E, and G is the answer

Explanation:

Hope it helps

Background: Nuclear energy can be used for various industrial applications, such as seawater desalination, hydrogen production, district heating or cooling, the extraction of tertiary oil resources and process heat applications such as cogeneration, coal to liquids conversion and assistance in the synthesis of chemical ...

An array of this size can produce an average of 350-850 kWh of AC energy per month.

Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.

Solar panel systems are measured in terms of kW. A common size solar panel array is usually around 5kW. An array of this size can produce an average of 350-850 kWh of AC energy per month.

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Answer:   Burning of wood is a chemical change while cutting of wood is a physical change because during burning, new substances are formed. After burning, we cannot get original substance, (i.e. wood) back. Cutting of wood into small pieces is a physical change because no new substance is formed.

Static stretches are those in which you remain in a single position—standing, sitting, or lying still—for up to 45 seconds. Dynamic stretches are regulated motions that get your ligaments, muscles.

Movement is included into dynamic stretches, such as lunges with a torso twist. As opposed to dynamic stretches, static stretches include holding a stretched position for a while. Stretches that are static include the triceps stretch and the butterfly stretch.

A swimmer might, for instance, circle their arms before entering the water. A series of movements to get the body moving before engaging in any kind of exercise can also be considered dynamic stretches.

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Energy transformation is the process of changing one form of energy into another form. It involves the conversion of energy from one form to another, such as mechanical energy to electrical energy or chemical energy to thermal energy. This process is fundamental to the functioning of the universe, and it occurs in natural and man-made systems alike.

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Ten devices that use batteries are: smartphones, laptops, flashlights, digital cameras, portable speakers, electric toothbrushes , remote controls, electric shavers, handheld game consoles, and electronic toys

What are the batteries?

Here are ten devices that use cells or batteries:

Whether or not the cells or batteries used in these devices are the best choice depends on various factors such as the device's power requirements, energy efficiency, cost, and environmental impact.

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For getting the mass of the truck, we have to just multiply the volume with the liquid density given and then add up the empty truck mass with it.

A liquid's density is a gauge of how heavy it is relative to the amount being measured or in simpler terms, the density of any kind of liquid is a measure of how much heavy it is for the amount measured.

Any kind of liquid that weighs heavier is termed denser if you weigh two liquids with similar volumes or amounts. A substance which is less dense than water will float if it is gently put on the water's surface.

Just like any kind of solid, the density of a liquid will be equal to the mass of the liquid divided by its volume. i.e., D = m/v.

Mass of the truck = (Volume x liquid density) + empty mass of the truck

= (28,000 x 0.90) + 15,500 kg

= 25,200 + 15,500

= 40,700 kg

Thus the mass of tge truck can be calculated as 40,700 kg.

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a) Answer:

Momentum = 6 kgm/s

Explanation:

Momentum = mass × velocity

Given that,

Therefore, momentum = (0.02 × 300)kgm/s

Momentum = 6 kgm/s

b) Answer:

Momentum =80 kgm/s

Explanation:

Momentum = mass × velocity

Given that,

Therefore, momentum = (40 × 2)kgm/s

Momentum = 80 kgm/s

c) Answer:

Momentum = 800 kgm/s

Explanation:

Momentum = mass × velocity

Given that,

Therefore, momentum = (200 × 4)kgm/s

Momentum =800 kgm/s

The correct answer is 0 N.

There will be no current in the rod and thus no magnetic force resisting the motion. Without any resistance, it will keep moving until acted on by an outside force according to Newton's first law.

What is motion?

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Answer:

electrons

Explanation:

Electrons orbit the nucleus while the protons an nuetrons are inside.

Answer:

The thermal efficiency, \(\eta _{reheat}\), of the Rankine cycle with reheat is 36.81%

Explanation:

p₁ = 8 MPa = 80 Bars

T₁ = 450°C = 723.15 K

From steam tables, we have;

v₁ = 0.0381970 m³/kg

h₁ = 3273.23 kJ/kg

s₁ = 6.5577 kJ/(kg·K) = s₂

The p₂ = 0.8 MPa

T₂ = Saturation temperature at 0.8 MPa = 170.414°C = 443.564 K

h₂ = 2768.30 kJ/kg

\(T_{2'}\) = 400°C = 673.15 K

\(h_{2'}\) = at 400°C and 0.8 MPa = 3480.6 kJ/kg

p₃ = 10 kPa = 0.1 Bar

T₃ = Saturation temperature at 10 kPa = 45.805 °C = 318.955 K

h₃ = 2583.89 kJ/kg

h₄ = \(h_{3f}\) = 191.812 kJ/kg

The thermal efficiency, \(\eta _{reheat}\), of a Rankine cycle with reheat is given as follows;

\(\eta _{reheat} = \dfrac{\left (h_{1}-h_{2} \right )+\left (h_{2'}-h_{3} \right )-W_{p}}{h_{1}-\left (h_{4}+W_{p} \right )+\left (h_{2'}-h_{2} \right )}\)

Therefore, we have;

\(\eta _{reheat} = \dfrac{(3273.23 -2768.30 ) + (3480.6 -2583.89 ) - 8.04)}{(3273.23 -(191.812 + 8.04) + (3480.6 -2768.30 ) } = 0.3681\)

Which in percentage is 36.81%.

Answer:

• From first newtons equation of linear motion:

\({ \boxed{v = u + at}}\)

• from that equation, let's get the relation for the change in velocity;

\((v - u) = at \\ { \boxed{ \boxed{\delta v = at}}}\)

• a is the acceleration, a = 0.3 m/s and t is time, t = 3s

\( \delta v = (0.3 \times 3) \\ { \underline{ \underline{ \delta v = 0.9 \: \: m {s}^{ - 1} }}}\)

Answer: A. 0.9 m/s

Answer:

Explanation:

The initial vertical velocity is 540sin55° = 442.342103... 442 m/s

The initial horizontal velocity is 540cos55° = 309.731275... 310 m/s

In the real world, both initial velocities would be reduced by air resistance and vertical velocity will be altered by gravity.

Answer:

The velocity when the ball hits the ground is obtained using v2. 2 = v1. 2 + 2 g Dy with v1=0 and Dy=h. Thus solving for v2 yields 17.1 m/s v2 = 2 g h =.

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Answer:

I e jofh ndoj eohe nc n very nic e

Answer:

graph b

Explanation:

graph a isnt constant

graph c is slower (less steep slope)

graph d is slowing down (starts high ends low)

Answer:

i would have to say B makes the most sense

Explanation:

According to the information we can infer that it is true that when we grip the steering wheel, we should place our hands on the steering wheel at the 3 and 9 or 4 and 8 o'clock positions to allow room for airbags to deploy.

To determine if the declaration is true we have to look for some information related with the position of our hands while we drive a car. In this case we can conclude that when gripping the steering wheel some experts recommend to place your hands at the 3 and 9 o'clock positions or the 4 and 8 o'clock positions.

The main reason to use these positions is because these allow us to get a better control and also ensure that there is enough space for the airbags to deploy in case of an accident.

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Answer: B) zero because both objects are at rest

Explanation:

Given the following :

Mass of anchor = 10kg

Mass of boat = 1000kg

Note : both boay and anchor are at rest, this gives a Velocity of zero

The momentum of a body is given as the product of Mass and velocity, that is,

Momentum = mass × velocity

Initial Momentum of anchor-boat system =

(mass of boat× initial velocity of boat) + (mass of anchor × initial velocity of anchor)

Initial Velocities of boat and anchor = 0

Therefore,

Initial momentum = (1000 × 0) + (10 × 0)

Initial momentum = (0 + 0) = 0

This is ecause both objects are at rest.

Yeah it feels weird, it gives me goosebumps. Im a boy actually, but when I think my self as a girl it just cringes me. But I also wonder how would my life would change.

Answer:

Explanation:

Given:

m = 1 200 kg

V = 54 km/h = 15 m/s

___________

Wk - ?

Wk = m·V² / 2

Wk = 1200·15² / 2 = 270 000  J   or Wk = 270 kJ

Answer:

Yes!

Explanation:

The slope of a velocity-time graph is indeed equal to the object's acceleration.

Sure ,Let's find angle between forces

\(\\ \sf\longmapsto R^2=A^2+B^2+2ABcos\theta\)

\(\\ \sf\longmapsto 27^2=20^2+40^2+2(20)(40)cos\theta\)

\(\\ \sf\longmapsto 729=400+1600+1600cos\theta\)

\(\\ \sf\longmapsto 729=2000+1600cos\theta\)

\(\\ \sf\longmapsto 1600cos\theta=-271\)

\(\\ \sf\longmapsto cos\theta=-0.169\)

\(\\ \sf\longmapsto \theta=cos^{-1}(-0.169)\)

\(\\ \sf\longmapsto \theta=80.2°\)

Answer:

D. Refracted

Explanation:

At the point when light passes from a less thick to a more thick substance, (for instance passing from air into water), the light is refracted (or bowed) towards the ordinary. The bowing happens on the grounds that light voyages all the more gradually in a denser medium. The answer is D, refracted.

Copernican heliocentrism was a novel concept that fundamentally altered the geocentric view of the universe.

The father of modern astronomy is Nicolaus Copernicus, a Polish astronomer and mathematician. The heliocentric hypothesis of the solar system, which he initially put forth, states that Earth and other planets rotate around the sun.

Nicolaus Copernicus created the Copernican heliocentrism astronomical theory, which was first presented in print in 1543. This theory put the Sun in the center of the cosmos, stationary, and had Earth and the other planets orbit it at uniform speeds in circular orbits modified by epicycles.

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The four individuals' lenses range in power from 0.7 D to 1.5 D to 2.0 D and 2.75 D, respectively.

The farsighted people are those with near point greater than 25 cm. A converging lens is needed to correct farsightedness, or hyperopia, therefore, the focal length, f, is positive. The image formed is virtual and on the same side of the lens. Thus, the image distance is negative. From the lens formula, 1/f = 1/v+1/u; but v is negative.

Here,

Therefore, 1/f = 1/u - 1/v

But, power of a lens = 1/f in meters.

Therefore,  P =  1/u - 1/v

They include Avishka, Berenice, Edouard and Francisca.

For Avishka, u = 25 cm or 0.25 m, v = 0.4 m

P = 1/ 0.25 - 1/0.4 = 1.5 D

For Berenice, u = 0.25 m, v = 0.3 m

P = 1/0.25 - 1/0.30 =0.7 D

For Edouard, u = 0.25 m, v = 0.80 m

P = 1/0.25 - 1/0.80 =2.75 D

For Francesca, u = 0.25 m, v = 0.50 m

P = 1/0.25 - 1/0.5 = 2.0 D

The order of power of lens of 4 people is from smaller to greater is 0.7 D<1.5 D<2.0 D<2.75 D.

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The minimum height h of a slope for a rider in a cart with combined mass m to complete a loop of radius r is h=5r.

The minimum height of the slope can be calculated by using the principle of conservation of energy and centripetal force. At the top of the loop, the rider and the cart have maximum potential energy, and at the bottom of the loop, they have maximum kinetic energy.

The minimum height of the slope is the point where the rider just completes the loop without falling off the track. To achieve this, the potential energy at the top of the loop must be equal to the kinetic energy at the bottom of the loop.

Hence, the minimum height of the slope required to complete a loop of radius r is given by h=5r. This ensures that the rider has enough speed to complete the loop without falling off. Additionally, the mass of the rider and the cart should be taken into account, as this affects the amount of force required to maintain the circular motion.

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When the same tuning fork is sounded together with the 266-hz tone, a beat frequency of 3 hz is produced, the frequency of the tuning fork is: 264 Hz.

When two out-of-tune flutes play the same note, and one produces a tone that has a frequency of 262 Hz, and the other produces 266 Hz. The beat frequency of 1 Hz is produced when a tuning fork is sounded together with the 262 Hz tone, and the same tuning fork is sounded together with the 266-Hz tone.

In this case, the frequency of the tuning fork is required. The formula for beat frequency is expressed as follows: Beat frequency = frequency 2 − frequency 1

The frequency of the tuning fork can be determined by subtracting the frequency of the 266 Hz tone from that of the 262 Hz tone (i.e. 266 - 262 = 4 Hz).

This implies that the tuning fork is 4 Hz higher than the 266 Hz tone. The beat frequency of 3 Hz when the same tuning fork is sounded together with the 266 Hz tone implies that the tuning fork's frequency is 3 Hz lower than the 269 Hz tone. The average of these two frequencies is 264 Hz (i.e. 266 Hz - 2 Hz). Therefore, the frequency of the tuning fork is 264 Hz.

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