<u>Answer:</u> The momentum of the car is 16000 kg.m/s
<u>Explanation:</u>
Momentum is defined as the force that keeps the object moving. It is also defined as the product of mass and velocity of an object.
Mathematically,
where,
p = momentum of the car = ?
m = mass of the car = 800 kg
v = velocity of the car = 20 m/s
Putting values in above equation, we get:
Hence, the momentum of the car is 16000 kg.m/s
Answer:
approximately 30 degrees
Explanation:
If it takes the cannonball 2 seconds to reach the maximum height, we can use the analysis of the vertical component of the velocity and the fact that the acceleration of gravity is the one acting opposite to this initial vertical component 
of the velocity. We know as well that at the top of the trajectory, the vertical component of the velocity is zero, and then the movement starts going down in it trajectory. So, the final velocity for the first part of the ascending movement is zero, giving us the following equation for the velocity under an accelerated movement (with acceleration of gravity "g" acting):
By knowing the vertical component of the initial velocity (19.6 m/s), and the actual magnitude of the total initial velocity (40 m/s), we can calculate what angle was the initial velocity vector forming above the horizontal. We use for such the fact that the sine of the angle relates the opposite side of a right angle triangle with the hypotenuse, and solve for the angle using the arcsin function:
which tells us that the closer answer shown is 
AnswerAmontons's law. If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. ... If the gas volume is decreased, the container wall area decreases and the molecule-wall collision frequency increases, both of which increase the pressure exerted by the gas (Figure 1).:
Explanation:
Answer:
15/f s
Explanation:
The refractive index n = 1.5 of the glass is n = λ₁/λ₂ where λ₁ = wavelength of monochromatic light in vacuum = L/10 and λ₂ = wavelength of monochromatic laser in glass.
So, λ₂ = λ₁/n.
We know the speed of light in glass, v = fλ₂ and λ₂ = v/f.
The light covers a distance d = L in time, t = d/v (since v = d/t)
So, the time it takes the pulse of light to travel from one end of the glass to the other is t = d/v = L/fλ₂ = L/fλ₁/n = nL/fλ₁ = nL/fL/10 = 10 × 1.5/f = 15/f s
So, the time it takes the pulse of light to travel from one end of the glass to the other is t = 15/f s
