University Physics 1 - Exam #1

An apple falls from an apple tree growing on a 20 degree slope. The apple hits the ground with an impact velocity of 16.2 m/s straight downward. What is the component of the apple's impact velocity parallel to the surface of the slope?

5.5 m/s

A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball? A) 74.2 m/s^2 B) 29.3 m/s^2 C) 67.9 m/s^2 D) 38.7 m/s^2 E) 14.8 m/s^2

D) 38.7 m/s^2

You walk 55 m to the north, then turn 60 degrees to your right and walk another 45 m. How far are you from where you originally started ? A) 50 m B) 94 m C) 46 m D) 87 m

D) 87 m

Two identical stones are dropped from rest and feel no air resistance as they fall. Stone A is dropped from height h, and stone B is dropped from height 2h. If stone A takes time t to reach the ground, stone B will take time

t sqrt(2)

A car accelerates from 10.0 m/s to 30.0 m/s at a rate of 3.00 m/s^2. How far does the car travel while accelerating?

133 m

The following exact conversion equivalents are given: 1 m = 100 cm, 1 in = 2.54 cm, and 1 ft = 12 in. If a computer screen has an area of 1.27 ft^2, this area is closest to A) 0.00284 m^2 B) 0.284 m^2 C) 0.118 m^2 D) 4.65 m^2 E) 0.0465 m^2

C) 0.118 m^2

A ball is thrown directly upward and experiences no air resistance. Which one of the following statements about its motion is correct? A) The acceleration is downward during the entire time the ball is in the air. B) The acceleration of the ball is upward while it is traveling up and downward while it is traveling down. C) The acceleration of the ball is downward while it is traveling up and downward while it is traveling down but is zero at the highest point when the ball stops. D) The acceleration of the ball is downward while it is traveling up and upward while it is traveling down.

A) The acceleration is downward during the entire time the ball is in the air.

A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will A) be over the package B) be behind the package C) depend of the speed of the plane when the package was released D) be in front of the package

A) be over the package

What is 0.674 / 0.74 to the proper number of significant figures? A) 0.9 B) 0.91 C) 0.911 D) 0.9108

B) 0.91

A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s^2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rock reach? A) 327 m B) 487 m C) 320 m D) 408 m E) 160 m

B) 487 m

For general projectile motion, when the projectile is at the highest point of its trajectory A) the horizontal and vertical components of its velocity are zero B) the horizontal component of its velocity is zero C) its velocity and acceleration are both zero D) its acceleration is zero E) its velocity is perpendicular to the acceleration

E) its velocity is perpendicular to the acceleration

The position x, in meters, of an object is given by the equation x= A+Bt+Ct^2 , where t represents time in seconds. What are the SI units of A, B, and C? A) m, s, s B) m, s, s^2 C) m, m, m D) m/s , m/s^2 , m/s^3 E) m, m/s, /s^2

E) m, m/s, /s^2

If the acceleration of an object is negative, the object must be slowing down. True / False ?

False

If you set the cruise control of your car to a certain sped and take a turn, the speed of the car will remain the same. Is the car accelerating? Yes or No

No

For an object in uniform circular motion, its velocity and acceleration vectors are always perpendicular to each other at every point in the path. True / False

True

A ball rolls across a floor with an acceleration of 0.100 m/s^2 in a direction opposite to its velocity. The ball has a velocity of 4.00 m/s after rolling a distance 6.00 m across the floor. What was the initial speed of the ball? A) 5.21 m/s B) 4.60 m/s C) 3.85 m/s D) 5.85 m/s E) 4.15 m/s

equation : v^2 = u^2 + 2as E) 4.15 m/s