Physics quiz 1

2. Given the relationship: 1 u = 1.66 x 10-27 kg, what is the value of 1 gram in terms of units of u? A) 1.66 x 10-24 u B) 1.66 x 1024 u C) 1.66 x 1027 u D) 6.02 x 1026 u E) 6.02 x 1023 u

E

7. Of the following situations, which one is impossible? A) A body having velocity east and acceleration east B) A body having velocity east and acceleration west C) A body having zero velocity and non-zero acceleration D) A body having constant acceleration and variable velocity E) A body having constant velocity and variable acceleration

E

4. A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip is: A) 0 km/hr B) 50 km/hr C) 100 km/hr D) 200 km/hr E) The answer cannot be calculated without knowing the acceleration

A

5. Which of the following five displacement versus time graphs represents the motion of an object whose speed is increasing? A) I B) II C) III D) IV E) V SEE PICTURE

A

10. While standing on the edge of a 100 m tall building, a person throws ball #1 up. Immediately, when the ball stops in midair and starts falling down ball #2 is released by the person. Which ball hits the ground first? A) Ball #1 B) Ball #2 C) They both hit at the same time

B

11. Suppose that you toss a rock upward so that it rises and then falls back to the earth. If the acceleration due to gravity is 9.8 m/sec2, what is the rock's acceleration at the instant that it reaches the top of its trajectory (where its velocity is momentarily zero)? Assume that air resistance is negligible A) The rock has an upward acceleration of 9.8 m/s2 B) The rock has a downward acceleration of 9.8 m/s2 C) The rock has an upward acceleration of 19.6 m/s2 D) The acceleration of the rock is zero. E) The rock has a downward acceleration of 19.6 m/s2

B

8. A car, initially at rest, travels 20 m in 4 s along a straight line with constant acceleration. The acceleration of the car is: A) 1.3 m/s2 B) 2.5 m/s2 C) 4.9 m/s2 D) 9.8 m/s2 E) There is not enough information to answer this question.

B

9. At a location where g = 9.80 m/s2, an object is thrown vertically down with an initial speed of 1.00 m/s. After 5.00 s the object will have traveled what distance? A) 125 m B) 128m C) 245m D) 250 m E) 255 m

B

1. The length of a rectangle is 2.536 cm. The width of the same rectangle is 1.41 cm. My calculator tells me that the area of the rectangle is 3.57576. What is the correct representation of this value? A) 3.575 cm2 B) 3.6 cm2 C) 3.57576 cm2 D) 3.58 cm2 E) All of the above

D

3. During a short interval of time the speed v in m/s of an automobile is given by v = at2 + bt3, where the time t is in seconds. The units of a and b are respectively: A) ms2; ms4 B) s3/m; s4/m C) m/s2; m/s3 D) m/s3; m/s4 E) m/s4; m/s5

D

6. Two automobiles are 150 kilometers apart and traveling toward each other at constant velocities. One automobile is moving at 60 km/h and the other is moving at 40 km/h toward each other. In how many hours will they meet? A) 2.5 h B) 2.0h C) 1.75 h D) 1.5 h E) 1.25 h

D