Question

1. A car with constant acceleration of 2.3 m/s2 drives toward east (positive x-axces). (a)How much time in seconds is required for the car to change its speed from 10 m/s to 35 m/s? (b)Calculate the total distance in meters, covered during that time (c) Calculate the average speed during that time interval (d) Find x- and y- components of the vector of acceleration

2. From the top of a tower, a person drops a pebble. The peble strikes the ground below in 5.7 sec. Ignore air resistance. a) calculate the final velocity of the pebble, just before it strikes the ground. b) Calculate the height of the tower c) Calculate the average velocity

3. Two forces act on a box on the tabletop, depicted in the picture (mass = 12.0 kg), as in the drawing: F1 = 140.0 N, direction 1350 with respect of X-axes, F2 is directed at 200 with respect to X-axes, magnitude is 76.0 N,. Ignore any friction. 3. Find the magnitude and force on the box. b) Find the magnitude and direction (relative to the X axis) of the acceleration of the box.

4. The gravitational the force Fsm acts between the sun and mars. The masses are: mass of mars = 6.39 1023 kg, mass of sun = 2.0 1030 kg. The orbit of mars is 141.6 million mi. The radius of mars is 2,106.1 mi. The radius of sun is 432,170 mi. a) Calculate the force acting on the mars by the sun c) Calculate the gravitational acceleration (as g on the earth) on the surface of mars. d) Calculate the speed (in m/sec) of mars around the sun, if the period of rotation is 687 days.

5.A car travels at a constant speed around a circular track whose radius is 3.0 mi. The car goes once around the track in 400 s. a) Determine the speed of the car (b) Find the magnitude of the centripetal acceleration of the car (c) Find the magnitude of the centripetal (frictional, static) force on the tires of the car.

Answer 1