2. Aunt Matilda goes to a well and throws a penny straight down the well at 4.0 m/s. She hears a splash after 0.4 seconds. How deep is the well? a) 1.6 m b) 2.4 m c) 2.8 m d) 3.2 m e) 5.2 m 3. A car starts from 0 m along a road and accelerates at 3 m/s2 to the right. A second car starts from 1000 m along the road and accelerates at 5 m/s2 to the left. Both cars started from rest. How long after they start do the cars meet? a) 16 s b) 17 s c) 18 s d) 19 s e) 20 s 4. A plane is coming in to land on a carrier deck. If it lands at 50 m/s and decelerates at a constant acceleration of -20 m/s2, then what is the minimum length of the carrier deck? a) 50.0 m b) 62.5 m c)75.0 m d) 81.8 m e) 93.7 m 31+bj 5. Given the vectors A a) 1k 11+ 3j. what is A XB? e) 12 and B b) 5k d) 8k 6. A planet has an escape velocity of 15 km/s and a radius of 5x106 m. What is the mass of this planet? a) 6.1x1024 kg b)7.4x1024 kg c) 84x1024 kg d) 8.8x1024 kg e) 1.01x1025 7. A chunk of ice floats in a glass of drinking water. What fraction of the ice is above the waterline? a)12% b) 10% c)8% d) 6% e)4%

(a) A car speedometer has a 5.0% uncertainty. What is the range of possible speeds when it reads 90 km/h? (b) Convert this range to miles per hour. (1Km=0.6214)

A landscape architect is planning an artificial waterfall in a city park. Water flowing at 0.750 m/s leaves the end of a horizontal channel at the top of a vertical wall h = 2.35 m high and falls into a pool (Fig. P3.54). (a) How far from the wall will the water land? Will the space behind the waterfall be wide enough for a pedestrian walkway? (b) To sell her plan to the city council, the architect wants to build a model to standard scale, one-twelfth actual size. How fast should the water flow in the channel in the model? Figure P3.54

A student drives the 100-mi trip back to campus after spring break and travels with an average speed of 52 mi/h for 1 hour and 30 minutes for the first part of the trip. (a) What distance was traveled during this time? (b) Traffic gets heavier, and the last part of the trip takes another half-hour. What was the average speed during this leg of the trip? (c) Find the average speed for the total trip.

Suppose you drop a rock into a dark well and, using precision equipment, you measure the time for the sound of a splash to return. (a) Neglecting the time required for sound to travel up the well, calculate the distance to the water if the sound returns in 2.0000 s. (b) Now calculate the distance taking into account the time for sound to travel up the well. The speed of sound is 332.00 m/s in this well.

(a) Refer to Table 1.3 to determine the average distance between the Earth and the Sun. Then calculate the average speed of the Earth in its orbit in kilometers per second. (b) What is this in meters per second?

Land west of the San Andreas fault in southern California is moving at an average velocity of about 6 cm/y northwest relative to land east of the fault. Los Angeles is west of the fault and may thus someday be at the same latitude as San Francisco, which is east of the fault. How far in the future will this occur if the displacement to be made is 590 km northwest, assuming the motion remains constant?

What is the speed of the bird in Exercise 2.4?

A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 7.86 107 km. Radio waves travel at the speed of light (3.00 108 m/s). How many seconds does it take the signal to reach the Earth?

An object is in motion when it undergoes a continuous change of ___. (2.1)