Explanation:
Given that,
Mass of the ball, m = 1.2 kg
Initial speed of the ball, u = 10 m/s
Height of the floor from ground, h = 32 m
(a) Let v is the final speed of the ball. It can be calculated using the conservation of energy as :
v = -25.04 m/s (negative as it rebounds)
The impulse acting on the ball is equal to the change in momentum. It can be calculated as :
J = -42.048 kg-m/s
(b) Time of contact, t = 0.02 s
Let F is the average force on the floor from by the ball. Impulse acting on an object is given by :
F = 0.8409 N
Hence, this is the required solution.
Answer:
Explanation:
In projectile, the formula for calculating the maximum height reached by the pin is expressed as;
H = u²/2g
u is the speed/velocity = 10m/s
g is the acceleration due to gravity = 9.81m/s²
Substitute
H = 10²/2(9.81)
H = 100/19.62
H = 5.097m
Hence the maximum height of the center of mass of the bowling pin is most nearly 5.0m
The Doppler effect says that if the source of a sound wave and the observer are moving further apart, the frequency of the sound as the observer hears it will decrease. This can be caused by the source moving away from the observer or the observer moving away from the source. Both C and D will cause the decrease in frequency.
Choice F
Answer:
B object at rest
Explanation:
object at rest means it wouldn't be moving, like a parked car or sleeping person therefore, B is the correct answer
Answer:
B. Does not compress under pressure
Explanation:
Brake fluids are fluids used to transmit the pressure applied from the brake pedals to the brakes. Fluids are used because they are not as compressible when compared to gases i.e., there is no loss of power when the pressure is applied.
Brake fluids are generally glycol-ether based. They do not corrode the metal parts and have a very high melting point.
