Yellow List - Short Vowels
An ideal spring with a force constant of 15 M/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required for an additional 4.0 cm
0.030
A stone initially moving at 8 on a level surface comes to rest due to friction after it travels 11 m.
0.3
What is the kinetic energy of a 120 cm thin uniform rod with a mass of 450 g that is rotating about its center at 3.60 rad/s
0.350
It requires 0.30 kJ of work to fully drive a stake into the ground. If the average resistive force on the stake by the ground is 828 N, how long is the stake?
0.36
A 1 kg object in a certain direction has a kinetic energy of 2.0 J. Hits a wall and comes back. What is the kinetic energy of this object at this point?
0.5
A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 to rest over 115 distance.
0.90
A 320 g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270 g cart. What is the speed of the 270 g cart just after the collision
1.36
A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height above the ground does it rise, assuming no air resistance?
10 m
A block slides down a frictionless inclined ramp and experiences no significant air resistance. Find speed of ramp as it reaches the bottom.
10.7
A wheel rotates through an angle of 13.8 rad as it slows down uniformly at 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel.
10.9
A pulley has an initial angular speed of 12.5 rad/s and a constant angular acceleration of 3.41 rad/s. Through what angle does the pulley turn in 5.26
113
A bicycle has wheels that are 60 cm in diameter. What is the angular speed of these wheels when 4.0 m/s
13
A cylinder of radius 8.0 cm rolls 20 cm in 5.0 s without slipping
140
foot
16 Nm
A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in 3.1 min, what is the average power
17
Find the net work done by friction on a box that moves in a complete circle of radius on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65 N A) 190 J B) 0 J C) 1800 J D) 370 J
190
Atwood machine
2.3
String is wrapped tightly around a fixed frictionless pulley
2.36
A stone is released from rest at a height h at the left of a loop the loop as shown in the figure. What is the minimum heigh h for which the stone will not fall off the track of the loop.
2.5 R
How many joules of energy are used by a 1.0 hp motor that runs for 1 hour
2.7 MJ
How large a net force is required to accelerate a 1600-kg SUV from rest to a speed of 25 m/s in a distance of 200 m?
2500
What is the net power needed to change the speed of a 1600 kg sport utility vehicle from 15 to 40 in 4 seconds
275 kW
certain car traveling at 34.0 mph skids to a stop in 29 meters from the point where the brakes were applied. In approximately what distance would the car have stopped had it been going 105.4 mph? A) 279 m B) 158 m C) 90 m D) 51 m E) 29 m
279
An ideal incompressible fluid flows at 12 m/s in a horizontal pipe. What is flow speed if radius x2
3
You want to store 1000 J of energy in an ideal spring when it is compressed by only 2.5 cm
3.2 x 10^6
A 50 kg load is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. By what distance will the wire stretch.
3.5
A solid uniform disk of diameter 3.20 m and mass 42 kg rolls without slipping to the bottom of a hill, starting from rest. If the angular speed of the disk is 4.27 rad/s at the bottom, how high did it start on the hill?
3.57
A sled is moving along a horizontal surface with a speed of 5.7 m/s. It then slides up a rough hill having a slope of 11 above the horizontal. How far along the surface does the block travel up the incline.
3.7
A machinist turns on the power to a grinding wheel
3.8. rad/s
A solid wooden door, 90 cm wide by 2.0 tall, has a mass of 35 kg. It is open and at rest. A small 500 g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning. Th ball rebounds along the same line with a speed of 16 m/s relative to the ground. How much energy is lost during this collision?
30 J
What is the minimum energy needed to lift a 1 kg rocket to a height of 200 km and to give it a speed of 8.0 km/s at that height
34 MJ
If you want to double the momentum of a gas molecule, by what factor must you increase its kinetic energy
4
Two uniform solid spheres have the same mass, but one has twice the radius of the other. The ratio of the larger sphere's moment of inertia to that of the smaller sphere is
4
A 30 N stone is dropped from a height fo 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction acted on the stone as it fell
4.1 N
A hoop is rolling without slipping along a horizontal surface with a forward speed of 5.50 m/s when it starts up a ramp the makes an angle of 25.0
4.22
A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute. What minimum power must be supplied to this machine? A) 520 W B) 3.9 kW C) 6.7 kW D) 4.3 kW E) 1.1 kW
4.3 kW
Lake Baikal
4.3 x 10^-3
a crane lifts a 425 steel beam vertically upward a distance of 95 m. How much work
4.7 x 10^5
Force of 16.88 applied tangentially to a wheel
4.78
A uniform solid cylindrical flywheel of radius 1.4 m and mass 15 kg rotates at 2.7 rad/s. What is magnitude of angular momentum
40
L shaped object. How much work to accelerate from rest to 3.25 rad/s
403
a 10 kg mass, hung by an ideal spring, causes the spring to stretch 2.0
49
A batter hits a 0.140 kg baseball that was approaching him
4900
An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s
5.1
How long does it take for a rotating object to speed up from 150 to 33.3 if it has uniform angular acceleration
5.30
How many joules of energy are used by a 2.0 hp Motor for one hour
5.4.x 10^6
Umbrella
5.6 x 10^25
A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25 degrees below
5.7
If 4.0 J of work are performed in stretching an ideal spring with a spring constant of 2500, what distance
5.7
a machinist turns on the power on to a grinding wheel at time t=0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 58 rad/s. The wheel is run at that angular velocity for 30 s, and then power is shut off. The wheel slows down uniformly at 1.4 rad/s^2 until the wheel stops. Revolutions?
510
In a police ballistics test, a 2.00-g bullet suddenly hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.20-m long string. This causes the block to swing through an arc of 3.50°. What was the speed of the bullet just before it hit the block? A) 16.7 m/s B) 524 m/s C) 25.3 m/s D) 262 m/s E) 789 m/s
524
Matthew pulls his little sister Sarah along the horizontal ground in a wagon.
575
A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object? A) 9.8 m/s B) 6.3 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s
6.3
A machinist turns on the power to a grinding wheel
64 s
Cinder block
8
A child is riding a merry-go-round that is turning at 7.18 rpm. If the child is standing 4.65 m from the center of the merry-go-round, how fast is the child moving?
8.05
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 x 10^7 of energy. What would be the angular speed
940
How much work would a child do while pulling a 12-kg wagon a distance of 4.3 m with a 22 N force?
95 J
A heavy dart and a light dart are launched horizontally on a frictionless table by identical ideal springs. Both springs were initially compressed by the same amount. Which of the following statements about these darts are correct?
Both darts had the same initial elastic potential energy
A heavy stone and a light stone are released from rest in such away that they both have the same amount of gravitational potential energy just as they are released. Air resistance is negligibly small. Which of the following statements about these stones are correct? (There could be more than one correct choice.)
Both stones have the same kinetic energy just as they reach the ground
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
The heavier one will have twice the kinetic energy of the lighter one
A lightweight object and a very heavy object are sliding with equal speeds along a frictionless surface. They both slide up the same frictionless hill with no air resistance. Which object rises to a greater height
same height