Gravitation
Momentum
Energy
Work/Power
Circular Rotation/Torque
100

Two balls have their centers 2.0 m apart. One has a mass of 8.0 kg. The other has a mass of 6.0 kg. What is the gravitational force between them?

8.0 * 10^-10 N

100

A collision that sticks together after they collide

What is an inelastic collision

100

You use 35 J of energy to move a 7.0 N object. How far did you move it

what is 5 m.

100

What is the unit of power?

What is watts 

😆🤣😜😂
100

A bicyclist is traveling at 15 m/s on a circular track with a radius of 150m. How long will it take him to complete one time around the track?

What is 62.83 s

200

Double Jeopardy: Choose how many points to bet. You must answer the question in its entirety for the question to be counted correctly. If the question is incorrect or not completely answered, points bet will be subtracted from the total score.

200

What does it mean to say momentum is conserved?

The total momentum before a collision must be equal to the total momentum after a collision

200

A 60-watt light bulb runs for 5.0 seconds how much energy does it use?

what is 300 J? 

e = pt
200

Calculate the work done by a 47 N force pushing a pencil 0.26 m

What is 12.22 J
200

Rob rides at speed v while in the seat of a rotating Ferris wheel. Horsing around, Rob decides to climb down a spoke of the wheel. He climbs one-quarter the distance toward the center, with people below astounded. What would be his linear speed at the central axis?

What is 0 m/s

300

Two identical objects attract each other with a force of 28 N. If the distance between them is 15 m, what is the mass of each object?

What is 9718681 kg

300

An average net force of 17.0 N acts on a 14 kg object for 250 s. What is the impulse

what is 4250 Ns

300

How much electrical energy (in kilowatt-hours) would a 60.0 W light bulb use in 80 days if left on steady

80 days * 24 hours * 60 watt

What is 115.2 kwh

300

A force of 5.0 N moves a 6.0 kg object along a rough floor at a constant speed of 2.5 m/s. 

a) how much work is done in 25 s? 

b) what power is being used? 

c) what force of friction is acting on the object?

what are:

a) w = fd; 2.5 m * 25 s = 62.5 m; 62.5 * 5 N = 312.5J

b) p = w/t; 312.5/25 = 12.5 w

c) 5 N

300

What is the mass of the meterstick shown in the figure: 

https://drive.google.com/file/d/1svnspzn68QCwbj7Qmly4MhjSEfixtll1/view?usp=sharing


What is 50 kg


50 kg * 10 = 500 N

500 N * .25 = 125


125 = .25F

F = 500

500/10 = 50 kg


400

The radius of the Moon's orbit is 60 times the radius of the Earth. What is the gravitational attraction of the Moon towards the Earth? Note the following: 

Radius of earth = 6.378*10^6 m

mass of earth = 5.96*10^24 kg

mass of moon = 7.34*10^22 kg

What is 1.992 * 10^20 N

400

A rifle fires a 0.15 kg bullet straight down a firing range. The bullet has a velocity of 200.0 m/s as it leaves the barrel which is 1.3 meters long. The rifle kicks back at roughly 3.5 m/s. What is the mass of the rifle?

what is ~ 8.57 kg

400

At the moment when a shotputter releases a 5.00 kg shot (directed straight up), the shot is 2.50 m above the ground when it leaves the shotputter's hand and is traveling at 15.0 m/s. It reaches a maximum height of 13.76 m above the ground and then falls to the ground. If air resistance is negligible: 

a) what was the potential energy of the shot as it left the hand relative to the ground? 

b) what was the kinetic energy of the shot as it left the hand? 

c) what was the total energy of the shot as it left the hand? 

d) what was the total energy of the shot as it reached its maximum height

e) what was the potential energy of the shot at its maximum height? 

f) what was the kinetic energy of the shot at its maximum height? 

g) what was the kinetic energy of the shot just before it hits the ground?


What are:

a) 5(10)(2.5) = 125 J

b) 0.5(5)(15^2)=563 J

c) 125 + 563 = 688 J

d) 5(10)(13.76) = 688 J

e) 688 J

f) 0 J

g) 688 J
400

Use the following diagram to answer the questions:

https://drive.google.com/file/d/14ddkUcR4p6e1EbI4kHomO30yoXz_NLfL/view?usp=sharing

The block of ice weighs 750 newtons. 

a) How much force parallel to the incline is needed to push it to the top

b) how much work is required to push it to the top of the incline

c) what is the potential energy of the block relative to ground level

d) what would be the potential energy if the block were simply lifted vertically 3m?

what are:

a) 375 J; PE = 750 * 3 = 2250; f*d = 2250; f = 375 J

b) 2250 J

c) 2250 J

d) 2250 J


400

Jose pushes perpendicular to a 2.5 m long door with force F at the door's far edge. Marie pushes the door from the opposite side and the door doesn't turn. Her push is perpendicular to the door, but at a point halfway from the hinge to the edge. Calculate Marie's push if Jose pushes with a force of 40N

What is 32 N

t = f * l

40 = f * (2.5/2) = 32

500

An Astronaut weighs 750 N on Earth. How much will he weigh when he is in orbit at a height of 240 km given the following information?

mass of earth = 5.97*10^24 kg

radius of earth = 6.38*10^6 m

What is ~695 N or 681 N


F = G * ((m_earth * m_astronaut)/(R_earth + h)^2)


6.67*10^-11 * (5.97*10^24 * 75)/(6.38*10^6 + 240*10^3)^2

= ~681 N

500

What is -2 m/s

500

A car battery is found to be capable of storing 2.00 kWh of electrical energy. For a certain electric car, it is necessary to develop 1.00 * 10^4 W of power to drive at 5.56 m/s. 

a) suppose that the car has 10 such batteries which result in 10 times the energy. How long (in hours) could it run if all 10 of them released all of their energy? 

b) how far (in kilometers) can the car go on its 10 batteries if they are fully charged?

what are: 

a) 1 kWh = 3,600,000 J/1 h

1 kWh * 2 = 7,200,000 J * 10 batteries = 72,000,000 J

72,000,000 J / 10^4 W of power = 7200 s

7200 s / 3600 = 2 hours


b) 5.56 m/s * 7200 s = 40,032 m = 40 km

500
A boulder with a mass of 215 kg is resting on top of a hill. It is pushed off the hill and rolls to the bottom. There is a 1200 kg car parked at the bottom which the boulder slams into with a velocity of 27.5 m/s.


How tall is the hill? Ignore friction and air resistance


v_final^2 = v_initial^2 + 2ad

27.5^2 = 756.25 m/s

2(10)d = 20d

756.25/20d = 37.8125 m

500

Using the diagram, what marking on the meterstick should the pentagon be placed to balance the stick if it were hanging from the halfway point. 

https://drive.google.com/file/d/1SbLfMdNFVEoH4Vx-0_s3EXTHai4sKuai/view?usp=sharing

What is 40 cm

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