Exam 2: Motion in One Dimension

A car is traveling at 120 km/h (75 mph). When applied the braking system can stop the car with a deceleration rate of 9.0 m/s². The typical reaction time for an alert driver is 0.5 s versus 2 s for a sleepy driver. Assuming a typical car length of 5 m, calculate the number of additional car lengths it takes the sleepy driver to stop compared to the alert driver.

You drive for 30 min at 100 km/h and then stop for 15 min. You then drive for 45 min at 80 km/h. Your average speed for the entire trip is

On a graph that shows position on the vertical axis and time on the horizontal axis, a straight line with a positive slope represents

A baseball is thrown vertically up to a height of 30 m on Earth. If the same ball is thrown up on the moon with the same initial speed how much further will it travel up? (Assume g_moon = g_earth/6)

The graph shows the instantaneous velocity of a car during 15 s of its motion. The distance traveled by this car during this 15-s interval is

Four successive displacements of 4 km, 5 km, 4 km, and 2 km are at right angles to each other as shown in the diagram. The magnitude of the resultant displacement is

Assume that the Deschutes River has straight and parallel banks and that the current is 0.75 m/s. Drifting down the river, you fall out of your boat and immediately grab a piling of the Warm Springs Bridge. You hold on for 40 s and then swim after the boat with a speed relative to the water of 0.95 m/s. The distance of the boat downstream from the bridge when you catch it is

The distance traveled by a car in the x-direction is shown. When the car changes speed for t = 10 s to 15 s, it does so uniformly. Use the graph below to answer the next question. -The acceleration of the car at 5 s is ____ acceleration at 20 s.

You drive for 30 min for 30 km East and then another 30 min for 40 km North. Your average speed for the entire trip is

The graph shows the velocity of a particle as a function of time. In the 12 s shown, the particle travels

On a graph that shows position on the vertical axis and time on the horizontal axis, a parabolic curve that opens upward represents

A river 1.00 mile wide flows with a constant speed of 1.00 mi/h. A man can row a boat at 2.00 mi/h. He crosses the river in a direction that puts him directly across the river from the starting point, and then he returns in a direction that puts him back at the starting point in the shortest time possible. The travel time for the man is

The velocity of a particle is given by v(t) = At² where A is a constant and the units for v are in m/s. The average velocity for the particle between t₁ and t₂ is

On a graph that shows velocity on the vertical axis and time on the horizontal axis, the area under the curve represents

A projectile is fired vertically upward with a speed of 62 m/s. In the absence of air resistance, the maximum height the projectile attains is

An object, located at the origin when t = 0, moves along the x axis as shown in the diagram. At which point is the object farthest from its starting point?

It takes the Mars rover 4.5 minutes to send information via a radio signal traveling at the speed of light back to Mission Control on Earth. How far away is the rover?

Only one of the following statements is correct. The correct statement is:

A hammer and feather are dropped from the same height above the lunar surface. Which object hits the ground first?

On a graph that shows position on the vertical axis and time on the horizontal axis, a parabolic curve that opens downward represents