Help!:

 

1. A 14 g coin slides upward on a surface that is inclined at an angle of 16° above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.23; the coefficient of static friction is 0.31. Find the magnitude and direction of the force of friction under the following circumstances.

(a) when the coin is sliding

.03 N

 

parallel to the incline

up the incline

down the incline

 

(b) after it comes to rest

.012 N

 

parallel to the incline

down the incline

up the incline

 

 

 

 

 

 

 

2. A 80 kg astronaut and a 1300 kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.23 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was the initial distance from the shuttle to the astronaut?

1.725 m

 

 

 

3. Find the orbital speed of a satellite in a circular orbit 2540 km above the surface of the Earth.

215320 km/s

 

 

 

 

 

 

 

 

4. The force shown in Figure 7-16 acts on a 1.7 kg object whose initial speed is 0.44 m/s and initial position is x = 0.27 m.

 

Figure 7-16

(a) Find the speed of the object when it is at the location x = 0.85 m.

.74 m/s

(b) At what location would the object's speed be 0.40 m/s?

.46 m

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