Reference no: EM1311617

Question 1. A 20 N horizontal force is applied to a 4.0 kg box. The box moves a horizontal distance of 3.0 meters. The work done by the 20 N force is ...?

1.     60 J
2.     80 J
3.     120 J
4.     140 J
5.     100 J

Question 2. Convert these to radian measure: (a) 30.0°, (b) 135°, (c) 1/4 revolution.

1. (a) 0.501 rad; (b) 2.36 rad; (c)   or 1.05 rad
2. (a) 0.524 rad; (b) 2.27 rad; (c)   or 1.57 rad       
3. (a) 0.524 rad; (b) 2.36 rad; (c)   or 1.05 rad
4. (a) 0.524 rad; (b) 2.36 rad; (c)   or 1.57 rad
5. (a) 0.501 rad; (b) 2.27 rad; (c)   or 1.05 rad

Question 3. An arrow is shot into the air at an angle of 60.0° above the horizontal with a speed of 20.0 m/s. (a) What are the x- and y-components of the velocity of the arrow 3.0 s after it leaves the bowstring? (b) What is the displacement of the arrow in the y-direction during the 3.0-s interval?

1. (a) 10.0 m/s and -12 m/s  (b) 6 m
2. (a) 10.0 m/s and -12 m/s  (b) 8 m
3. (a) 12.0 m/s and -10 m/s  (b) 8 m
4. (a) 12.0 m/s and -10 m/s  (b) 6 m

Question 4. A roller coaster is towed up an incline at a steady speed of 0.50 m/s by a chain parallel to the surface of the incline. The slope is 3.0%, which means that the elevation increases by 3.0 m for every 100.0 m of distance along the surface. The mass of the roller coaster is 400.0 kg. Neglecting friction, what is the magnitude of the force exerted on the roller coaster by the chain?

1. 510 N
2. 205 N
3. 120 N
4. 335 N
5. 80 N

Question 5. A runner runs three-quarters of the way around a circular track, of radius 60.0 m, when she collides with another runner and trips. (a) How far had the runner traveled on the track before the collision? (b) What was the magnitude of the displacement of the runner from her starting position when the accident occurred?

1.  (a) 292 m (b) 78.6 m
2.  (a) 265 m (b) 93.4 m
3.  (a) 278 m (b) 86.8 m
4.  (a) 283 m (b) 84.9 m