Answer:
J = 0.7 N-s away from wall
Explanation:
Given that,
Mass of the ball, m = 0.2 kg
Initial speed of the ball, u = 2 m/s
Final speed of the ball, v = -1.5 m/s (as it rebounds)
Impulse is equal to the change in momentum. So,
So, the impulse given to the ball is 0.7 N-m and it is away from the wall. Hence, the correct option is (c).
By definition, the speed of an object is given by:
Where,
dr/dt: derived from the position with respect to time
Therefore, speed has units of length over units of time.
Thus, speed is a derived quantity, since it depends on the value of two other quantities.
Answer:
a derived quantity is:
C. Speed
Answer:
10 kg
Explanation:
Assuming a frictionless surface, then force F=ma where F is the applied force, m is the mass and a is acceleration. Making m the subject of the formula then
Substituting 100 N for the applied force F and 10 m/s^2 for acceleration a then the value of m will be
Therefore, in terms of kilograms, the bookshelf weighs 10 Kg
Answer:
B. The buoyant force on the copper block is greater than the buoyant force on the lead block.
Explanation:
Given;
mass of lead block, m₁ = 200 g = 0.2 kg
mass of copper block, m₂ = 200 g = 0.2 kg
density of water, ρ = 1 g/cm³
density of lead block, ρ₁ = 11.34 g/cm³
density of copper block, ρ₂ = 8.96 g/cm³
The buoyant force on each block is calculated as;
The buoyant force of lead block;
The buoyant force of copper block
Therefore, the buoyant force on the copper block is greater than the buoyant force on the lead block