Answer:
Acceleration due to gravity on a certain planet = 4 m/s²
Explanation:
According to the question,
Weight = 30 N
Mass = 7.5 kg
Let acceleration due to gravity be 'a'
<u>Formula</u>:
Weight = Mass × Acceleration due to gravity
30 = 7.5 × a
a = 30/7.5
a = 4 m/s²
Explanation:
Maximum two significant digits represents the number at the position 0.01. The experimental values are taken as only two significant digits is because after two digits the value can be neglected as these values are very small as compared to the whole number.
Thus, all the experimental values are represented by two significant digits.
Answer:
Net force = 0
Explanation:
Whenever there is an unbalanced force, it shows that the net force doesn’t = 0 because if net force = 0, then everything force is balanced by another force. If there is an unbalanced force, acceleration will occur in the direction the net force is towards.
Answer:
(i) Momentum of the system is constant
(ii) Total kinetic energy of the system is not constant.
Explanation:
In perfectly inelastic collision, the total momentum of the system is constant while the the total kinetic energy of the system is not constant. The total; kinetic energy is not constant because some of the energy is lost in the process of collision. In this case, two bodies sticks together and both will move with a constant velocity. Also, the coefficient of restitution is equal to 0.
Answer:
D
Explanation:
The friction force is the weight force times the coefficient of friction. So diving by the coefficient gives you the weight force which is equivalent to the normal force.
