Physics Final

A person pushes a box across a horizontal surface at a constant speed of .5 m/s. The box has a mass of 40kg, and the coefficient of sliding friction is .25. The power supplied to the box by the person

50w

What must be your average speed, in m/s, in order to travel 171km in 5.15h

9.2m/s

A child moving at constant velocity carries a 2N ice-cream cone 1m across a level surface. What is the net work done on the ice-cream cone

0J

A motorcycle has a mass of 250 kg. It goes around a 13.7m radius turn at 96.5km/hr. What is the centripetal force on the motorcycle

1.31*10^4N

Bob (1235kg) floats in space at a center to center distance of 6.7 meters from frank(m95kg). Calculate the force of attraction between the two dudes

1.76e-008N

At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?

45

As Josh accelerates in his pickup truck at 2.3 m/s^2, a 200 kg box in the back does not slide. The force of friction that must act on the box to keep it from slipping in the back of the truck is ____ newtons

460

Which of the following is a true statement about the conservation energy?

The total energy is always conserved

A 3kg object moves to the right at 4 m/s. It collides head-on with a 6 kg object moving to the left at 2m/s. Which statement is correct?

The total momentum both before and after the collision is zero

In this text, which of the following symbols represents gravitational field strength?

g

How much power is required to lift a 4.1 kg mass at a speed of 2.7m/s

108W

The force of friction on a sliding object is 10N. The applied force needed to maintain a constant velocity is

10N ****

Graph with ball thrown. 3s

0

A system consists of two objects having masses m1 and m2 (m1<m2). The objects are connected by a massless string, hung over a pulley as shown above, and then released. When the object of mass m2 has descended a distance h, the potential energy of the system has decreased by

(m2-m1)gh

A bullet moving horizontally to the right (x+ direction) with a speed of 436 m/s strikes a sandbag and penetrates a distance of 10.0 cm. what is the average acceleration in m/s^2, of the bullet?

-9.5 *10^5 m/s^2

The city of Mountain Forge rests at an altitude of 2781m above sea level, but is only 1881 m above the valley below. Find the potential energy stored in Mustafa Jones (m=65kg) as measured from the valley below while he sleeps in a hotel in Mountain Forge

1198

The city of mountain Forge rests at an altitude of 2625m above sea level, but is only 1701m above the valley below. Find the potential energy stored in MJ (m65) as measured from sea level

1672KJ

The diagram below represents a box sliding down an incline. Force of friction is directed towards...

2

Car J moves twice as fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car K is

2 to 1

A 0.119 Kg ball is dropped from rest. If the magnitude of the ball's momentum is 0.817kg*m/s just before it lands on the ground, from heigh was it dropped?

2.4m

A force of 255N is used to push a box of mass 54.9kg across a floor. the coefficient of kinetic friction between the box and the floor is 0.12. What is the acceleration of the box?

2.92m/s^2****

When the frictionless system shown above is accelerated by an applied force of magnitude F, the tension in the string between the blocks is

2/3F****

A ball is thrown up from street level and returns to its original heigh as shown in the graph below. Use the graph to find the initial velocity of the ball

30 m/s

A disk spins and makes 52.09 revolutions. through how many radians did the disk spin?

327.3 radians

A disk with a diameter of 20cm spins at a rate of 32.44 revolutions per minute. Calculate the linear speed of the edge of the disk in cm/s

34cm/s

In which of the following scenarios is work done?

A car decelerates while traveling on a flat stretch of road

If you drop a stone into a hole drilled all the way to the other side of the earth then the stone will

Speed up until it gets to the center of the Earth

At time t=0, Car traveling with speed V0 passes car Y. which is just starting to move. both cats then travel on two parallel lanes of the same straight road. The graphs of speed v versus time t for both cars are shown above. which of the following is true at time t=20s

Car Y is behind car X

At time t=0, Car traveling with speed V0 passes car Y. which is just starting to move. both cats then travel on two parallel lanes of the same straight road. The graphs of speed v versus time t for both cars are shown above. From t=0 to time=40s, the areas under both curves are equal. Therefore, which of the following is true at time t=40s

Car Y is passing car X

The graph above describes the motion of a ball. At what point is the speed of the balls equal to its speed at B

D

Two children are on a merry-go-round. Which child has the faster linear speed?

The child near the edge

According to Newton, doubling the distance between two interacting objects

Divides by 4 the gravitational force between them

Two boxes of masses m and 3m are stacked. The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough.IF the less massive box does not slide on the more massive box, what is the static friction force on the less massive box?

F/4****

An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U

K increases and U decreases

Which of the following statements about the conservation of momentum is NOT correct

Momentum is not conserved for a system of objects in a head-on collision

What are the units for a spring constant

N/m

The conservation of momentum is most closely related to

Newton's third law

The period of a satellite, the time it takes for a complete revolution, depends on the satelite's

Radial distance

An Object slides off a roof 10 meters above the ground with an initial horizontal speed of 5 m/s as shown above. The time between the object's leaving the roof and hitting the ground is most nearly

Root 2

A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will

be over the bomb

A ball is thrown and follows the parablolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground Which of the following diagrams best shows the direction of the acceleration of the ball at point P?

c. | V

A racing car is moving around the circular track of radius 300 meters shown above. At the instant when the car's velocity is directed due east, its acceleration is directed due south and has a magnitude of 3 meters per second squared. When viewed from above, the car is moving

clockwise 30m/s

If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will

doubled

IF one object has twice as much mass as another object, it also has much

inertia

Two objects collide and stick together. Kinetic energy

is definitely not conserved

A newton is equivalent to which of the following quantities

kg*m/s^2

2A sailboat of mass m is moving with a momentum p. How would you represent kinetic energy in terms of these two quantities

p^2/(2m)

A sailboat of mass m is moving with a momentum p. How would you represent kinetic energy in terms of these two quantities

p^2/(2m)

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is

the same

If you walk 5m horizontally forward at a constant velocity cartrying a 10-N object, the amount of you do is

zero

Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be

zero

The displacement ox of an object moving along the x axis is shown above as a function of time t. The acceleration of this object must be

zero