Kinematics
A man leans over the edge of a cliff and throws a rock upward at 5.2 m/s. Neglecting air resistance, one second later the rock’s speed is
4.6 m/s
1.5 m = ? cm
150 cm
A 50 kg sack is lifted onto a shelf that is 2 meters off the ground. A 25 kg sack is lifted onto a shelf that is 5 meters off the ground. Which one requires more work?
a) lifting the 50 kg sack 2 meters
b) lifting the 25 kg sack 5 meters
c) the same
d) need more information
b) lifting the 25 kg sack 5 meters
A displacement has an x-component of 15 cm and a y-component of -10 cm. The magnitude of the displacement vector is
18 cm
While an object near the earth's surface is in free-fall, its _____ increases.
a) velocity
b) mass
c) acceleration
a) velocity
A horse gallops a distance of 13 kilometers in 33 minutes. What is the average speed in km/hr?
23.64 km/hr
The metric system of measurement is based on the number
10
You carry a 14 kg dog at a constant height of 2 m above the ground at a constant speed across a 3 m room. How much work is done on the dog?
Work = 0 J because the height is constant
Which of the following is a vector?
a) mass
b) weight
c) temperature
d) volume
b) weight
A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water
a) Is greater for the fired bullet
b) Is greater for the dropped bullet
c) Is the same for both bullet
c
A corgi runs at a constant velocity of 2.9 m/s towards its owner who is 27 meters away. How long will it take the Corgi to reach its owner?
9.3 s
Convert 3.758 amu to torr (1 amu =760 torr)
2856.08 torr
How fast must a 4.0 kg cat run to have a kinetic energy of 350 J?
13.23 m/s
If a vector has components Ax > 0, and Ay > 0, then the angle that this vector makes with the positive x-axis must be in the range:
a) 0° to 90°
b) 90° to 180°
c) 270° to 360°
d) 180° to 270°
a) 0° to 90
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
a) less than 10 N
b) more than 10 N
c) 10 N
c) 10 N
A flying squirrel is originally traveling 120 m/s when he accelerates uniformly for 227 meters at 16 m/s2. What is its final speed?
147 m/s
List at least 4 prefixes used with SI unit
giga-, mega-, kilo-, hecto-, deka-, deci-, centi-, milli-, micro-, nano-, base unit
How high a hill would a 60 kg hiker have to climb to increase her gravitational potential energy by 42,500 J?
72.3 meters
Given:
Displacement vector A has x-component = 4 m and y-component = 3 m.
Displacement vector B has x-component = -4 m and y-component = -3 m.
Displacement vector C = A + B.
What is the magnitude of C?
0 because Vector A is positive 5 and Vector B is negative 5
Suppose a particle is being accelerated through space by a 10 N force. Suddenly The particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting
a) theoretically tends to accelerate towards the speed of light
b) is brought to a rapid halt
c) continues at the speed it had when it encountered the second force
d) decelerates gradually to a halt
c) continues at the speed it had when it encountered the second force
A little boy uniformly accelerated his toy car from rest at 6m/s2 in 1.9 seconds. What is the car’s final velocity? What is the car’s final car displacement?
11.4 m/s, 10.83 m
The speed of light in a vacuum is approx. 0.3 Gm/s. What is the speed of light in m/s?
3 x 10^8m/s
A child does 350 Joules of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.o m above the ground. What is the mass of the box?
8.93 kg
A child pulls a sled through the snow with a force of 50 N exerted at an angle of 30 degrees above the horizontal. Find the horizontal and vertical components of this force.
horizontal: 50*cos(30) = 43.3 N
vertical: 50*sin(30) = 25 N
A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
a) weight of the bat
b) force that the ball exerts on the bat
c)weight of the ball
d) grip of the player’s hand against the ball
b) force that the ball exerts on the bat