A communications satellite is in a circular orbit about the Earth at an altitude of $3.56 \times 10^4 \mathrm{~km}$. How many seconds does it take a signal from the satellite to reach a television receiving station? (Radio signals travel at the speed of light, $3.00 \times 10^8 \mathrm{~m} / \mathrm{s}$.)

For projectile motion, list down the two quantities that are constant. (Neglect air resistance.)

Shows the Hoover Dam Bridge over the Colorado River at a height of 271m. If a heavy object is dropped from the bridge, how much time passes before the object makes a splash?

What is the direction of a person's acceleration vector on a spinning Earth if the person is at (a) the equator? (b) at some other latitude? (c) at the poles?

What speed does the ball in Exercise 15 have in falling 3.5 s?

A ball is dropped from the top of an 80 -m-high building. Does the ball reach the ground in $4.0 \mathrm{~s}$ ?

A car travels on a straight, level road. Starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. Identify the car’s average acceleration in ft/s2. In 4.0 more seconds, the car is going 88 ft/s (60 mi/h). Identify the car’s average acceleration for this time period? The car then slows to 66 ft/s (45 mi/h) in 3.0 s. Identify the average acceleration for this time period. Determine the overall average acceleration for the total time. (Recall these convenient British unit conversions: 60 mi/h 5 88 ft/s, 45 mi/h 5 66 ft/s, and 30 mi/h 5 44 ft/s.)

Are we accelerating as a consequence of the Earth spinning on its axis? Explain.

A motorboat starting from rest travels in a straight line on a lake. If the boat gets a speed of 8.0 m/s in 10 s, what is the boat’s average acceleration? If the boat continues with the same acceleration, what would be its speed after another 5.0 s?

What does the term centripetal mean?

Modern oil tankers weigh more than a half-million tons and have lengths of up to one-fourth mile. Such massive ships need a distance of 5.0 km (about 3.0 mi) and a time of 20 min to come to a stop from a top speed of 30 km/h. Identify the magnitude of such a ship’s average acceleration in m/s2 in coming to a stop. Determine the magnitude of the ship’s average velocity in m/s. Comment on the potential of a tanker running aground.

A football is thrown on a long pass. Compared to the ball’s initial horizontal velocity, the velocity at the highest point is ______.

(a) greater

(b) less

(c) the same

Can a car be moving at a constant speed of $60 \mathrm{~km} / \mathrm{h}$ and still be accelerating? Explain.

A vertically projected object has zero velocity at its maximum height, but the acceleration is not zero. What would be involve if the acceleration were zero?