Answer:
The linear acceleration of Q is twice as great as the linear acceleration of P.
Explanation:
As we know that disc is rotating about the vertical axis with constant angular speed
So here we can say that the acceleration of any point on the disc is given as
where we know that
r = radial distance of the point
also for the linear speed of the point on the disc is given as
so we know that
distance of point Q is double the distance of point P
so we will have
(And don't forget that an object going around a curve at a constant speed is also accelerating.)
I believe there are two reasons:
1). The term is inadequately taught in the American public school system ... along with much of the rest of Science and Math in general.
2). The word became permanently and indelibly corrupted when the automotive industry decided to name the gas pedal the "accelerator".
Answer:
Explanation:
The efficiency of the heat engine is less than 100%. The heat engine converts the thermal energy from the burning of fuel to the mechanival energy. Thus, some of the energy gets lost as waste heat.
Hence, this waste heat is used up to heat up the interior of the car and person feels warmer in the car.
Thus, the waste heat generated in the engine is used for the heating of the car interior.
Answer:
C) 3,000 kg m/s
Explanation:
We can consider the horizontal velocity of the motorcycle to be zero, since it rolls off the edge of the cliff very slowly. So, we only need to find the vertical velocity at the time of the impact with the ground.
The vertical velocity of the motorcycle at time t is given by (free-fall motion):
where
is the initial vertical velocity (zero, since the motorcycle is not moving)
g = 9.8 m/s^2 is the acceleration due to gravity
t is the time
Since the motorcycle hits the ground after t = 3 seconds, we have
And since we know its mass, m=100 kg, we can find its momentum:
and the negative sign simply means downward direction.