PHYSICS 1E03 Lecture Notes - Lecture 12: Cartesian Coordinate System, The Brakes, Minuscule 22

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indigowasp984

12 Apr 2016

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Csula (solution) midterm physics 211 fall 2007: conceptual questions, consider the following controls in an automobile: gas pedal, brakes, and steering wheel. The controls in this list that cause an acceleration of the car are: (e) all three controls. Gas pedal causes the car to speed up. The brakes cause the car to slow down. The steering wheel changes the direction of the velocity vector. You repeat the experiment, but with a force that is twice as large. What interval is now required to reach the same final speed v? (d) t /2. With twice the force, the object will experience twice the acceleration. Because the force is constant, the acceleration is constant and the speed of the object (starting from the rest) is given by v = at. With twice acceleration the object will arrive at speed v at half the time.

Related Questions

Consider the following controls in an automobile in motion: gas pedal, brake, steering wheel. What are the controls on this list that can cause an acceleration of the car?

a. all three controls

b. the gas pedal and the brake

c. only the brake

d. only the gas pedal

e. only the steering wheel

bronzedeer29

1. A force is a vector quantity because it has both

A) mass and acceleration.

B) action and reaction counterparts.

C) magnitude and direction.

2. If an object's mass is decreasing while a constant force is applied to the object, the acceleration

A) remains the same.

B) decreases.

C) increases.

3. For an action force, there must be a reaction force that

A) is exactly equal in magnitude.

B) always acts in the same direction.

C) is slightly smaller in magnitude than the action force.

D) is slightly larger in amplitude than the action force.

4. A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is

A) more than 1000 N.

B) less than 1000 N.

C) 1000 N.

D) impossible to determine.

5. If you push an object a given distance, while applying twice the force, you do

A) twice as much work.

B) four times as much work.

C) half as much work.

D) the same amount of work.

6. A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of

A) effort

B) power

C) energy

D) none of these

crimsonbear569

The figure shows three graphs, A, B, C, which collectively describe the motion of an object in one dimension. The horizontal axis of each graph is time (symbol t). The vertical axes of the graphs are different. For one graph the vertical axis is position (symbol x), for another, it is the velocity (symbol v), and for another, it is acceleration (symbol a). Where the axes across is the point of zero for both time and the quantity corresponding to the vertical axis. Part A: For which sequence of graphs is the vertical coordinate position, velocity, and acceleration, respectively? (e.g., If you think graph Y is position versus time, graph X is velocity versus time, and graph Z is acceleration versus time, then your answer is Y, X, Z.). Multiple choice: 1)C, A, B 2)A, C, B 3)C, B, A 4)B, C, A 5)B, A, C 6)A, B, C. Part (b) Which one of the following situations can be most accurately represented by the graph, consistent with your answer to part (a)? (1) A car driving in the negative x-direction suddenly shifts into reverse and, with tires spinning, slows to a momentary stop before beginning to move in the position x-direction. (2)A car driving in the position x-direction slams on its brakes and comes to rest. (3) A rock is dropped from the rest from the top of a tall building. Assume air drag can be neglected, in which case its speed increases by the same amount each second. Take upward to be the position x-direction. (4) A sprinter runs a 100-meter dash and she runs in the negative x-direction. Starting from rest, she has a constant acceleration for the first 50 meters, then a constant speed for the remaining 50. Multiple choices: 1)4, 2)3, 3)2, 4)1.

carmineporpoise991

PHYSICS 1E03 Lecture Notes - Lecture 12: Cartesian Coordinate System, The Brakes, Minuscule 22

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