Answer:
(1) is incorrect and (2) is correct.
Explanation:
There is a force of friction opposing the motion, but as soon as Jill let go of the ball, there is no force pushing the ball onward. Therefore, the only forces acting on the ball is the force of friction and air resistance. (still friction)
Answer:
F = 2 I A / c
Explanation:
The radiation pressure on a reflective surface is
P = 2 S / c
Where S is the Poynting Vector and c the speed of light
Furthermore pressure is defined as the ratio of force to area
P = F / A
Let's replace
F / A = 2 S / c
F = 2 S A / c
The poynting vector is the power per unit area that is equal to the intensity
S = I
F = 2 I A / c
The solution to the problem is as follows:
Normal force is m*g plus 240 N*sin30.
<span>30 kg*9.8 m/s^2 + 240 N*sin30 = 414 N
</span>
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First convert 90km/hr to m/s.
Initiate velocity = 0m/s (car was at rest)
Final velocity is 25m/s (90km/hr converted)
25m/s - 0m/s / 8s = 3.125 m/s^s
Therefore the answer is option A (3.13m/s^2)
Answer:
question 1: force
question 2: velocity or inertia
question 3: 0
