That the Earth was the center of the universe.
Answer: Earth
The object’s motion changes :)
Answer:
, in the direction of F2
Explanation:
The magnitude of F2 is larger than that of F1: this means that the wagon will tend to move in the direction of F2. Therefore, the direction of friction will be opposite to the direction of motion, therefore in the direction of F1.
Let's now take the direction of the force exerted by the second child, F2, as positive direction. Then the direction of F1 and of the force of friction () will be negative: so we have
We can write the equation of the forces for the third child+wagon:
where
m = 30.0 kg is the combined mass of the child + the wagon
Now we can solve the equation for a, to find the acceleration:
Answer: 450J
Explanation:
Mass of ball = 1.0kg
kinetic energy = ?
velocity of the ball = 30m/s
Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the velocity (v) by which it moves
i.e K.E = 1/2mv²
KE = 1/2 x 1.0kg x (30m/s)^2
KE = 0.5 x 1.0 x 900
KE = 450J
(Recall that kinetic energy is equal to potential energy at the top of its ascent)
So, if KE = 450J; PE = 450J
Thus, the potential energy of the ball is 450 joules.
Answer:
b) the result we got can be termed approximation because we are neglecting the shear stress acting on the two ends of the cylinder. Here we have considered only the share stress acting on the curved surface area only.
Explanation:
check attachment for solution to A