Answer :The Momentum of a man riding his bicycle downhill is 400 kg m/s.
Explanation:
Mass of the man of bicycle = 40 kg
Velocity of the bicycle = 10 m/s
Momentum = Mass × Velocity = 40 kg × 10 m/s = 400 kg m/s
The Momentum of a man riding his bicycle downhill is 400 kg m/s.
Answer:
The acceleration of the car is 5m/s²
Explanation:
Given data
Force F= 4,000N
Mass of car m= 800kg
Acceleration a= ?
Applying the Newton's second law of motion which states that the rate of change of momentum of a body is proportional to the external force and takes place in the direction of the force
F=ma
a= F/m
a= 4000/800
a=5m/s²
Answer:
B. They usually need to be cooled to dissipate thermal energy build-up and prevent damage.
Explanation:
High energy mechanical devices needs to be cooled down because they have moving parts which creates heat which may affect the other electrical and electronic component of the device. Because quality of material changes with the temperature. If high temperature occur might change the shape of that component and may affect the efficiency of the machine.
S = 1/2 g t^2
So t^2 = 2 S / g
So time = square root ( 300 / 9.80 )
The speed of an object is measured by calculating the distance it travels per unit time.
The formula in Physics for calculating speed is = distance/ time.
Since an object at rest is not covering any distance, the speed is always assumed to be 0 m/s.
