A. the ability to do work
Answer:
The work done is, w = 6 x 10² J
Explanation:
Given,
The angle of the incline, ∅ = 30°
The force applied parallel to the incline, F = 60 N
The displacement caused by the force along the incline, s = 10 m
Since the force and displacement is along the incline, the angle of incline doesn't contribute to the work done.
The work done by the force is given by the relation,
W = F · S
= 60 N x 10 m
= 600 J
Hence, the work done by Roger pushing the box is, W = 600 J
Answer:
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall. (i) Name the force exerted ...
Answer:
the buoyant force F will be 0.84 N
Explanation:
Assuming that a person has the density of water , then its volume could be calculated through
V= m/ρ , where m= mass of the person , ρ= density of water
then
V= m/ρ = 70 kg/ 1000 kg/m³ = 0.07 m³
then the buoyant force will be equal to the mass of displaced air in the volume V.
if we assume that the density of air in the atmosphere is ρa=1.225 kg/m³ then the buoyant force F will be
F= ρa*V*g = 0.07 m³*1.225 kg/m³ *9.8 m/s² =0.84 N
Answer: The mass of ball is 10 grams.
Explanation:
Given : Kinetic energy = 4.5 J
Velocity = 30 m/s
The formula for Kinetic energy is as follows.
where,
K.E = Kinetic energy
m = mass
v = velocity
Substitute the values into above formula as follows.
Thus, we can conclude that the mass of ball is 10 grams.