# Project #105569 - Physics questions

1.)  A child sitting in a tree throws his apple core from where he is perched (4.0 m high) with a velocity of 5.0 m/s [35o above the horizontal], and it hits the ground right next to his friend.

2.)        Explain three ways in which understanding projectile motion and relative velocity could help you to improve your success in a basketball game

3.If an object is in motion, does that mean that the object has a net force in the direction of that motion? Explain.

4.         At a construction site, a small crane is raising two boxes of nails on a plank to the roof. One box has already been opened and is half full, while the other box is new. The boxes, including the nails, weigh 10 kg and 20 kg, respectively, and are both the same size.

As the plank tilts towards the heavier box, predict which box of nails will start to slide first. Explain your prediction.

If the coefficient of static friction is 0.4, draw an FBD for each box of nails and use it to calculate the angle at which each box begins to slide.

Given:

μ_s=0.4

Required:

θ

Analysis and solution:

c)         If the coefficient of kinetic friction is 0.3, how fast will the boxes accelerate along the plank, one they start to slide?

5.)A bus passenger has her laptop sitting on the flat seat beside her as the bus, travelling at 10.0 m/s, goes around a turn with a radius of 25.0 m. What minimum coefficient of static friction is necessary to keep the laptop from sliding?

6.)  Sometimes, road surfaces have banked curves. Use an FBD to explain how this helps cars to make turns more safely.

7.) 12.  Keys with a combined mass of 0.100 kg are attached to a 0.25 m long string and swung in a circle in the vertical plane.

a)     What is the lowest speed that the keys can swing and still maintain a circular path?

Given:r= 0.25m

Required: minimum possible v

Analysis and solution:

a)     What is the tension in the string at the bottom of the circle?

Given:

m=0.100kg

r=0.25m

v=1.6m/s

 Subject Science Due By (Pacific Time) 01/27/2016 07:15 pm
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