Forces and Motion
A driver drives 30 km north than 40 km South. What is the displacement?
50km
The rate at which work is done
power
Fifty Newtons of force are applied to a wrench handle 20 centimeters long. Calculate the torque
10 N m
Convert 3 K to Celsius.
-270 C
A car traveling at 7 m/s accelerates uniformly at 2.5 m/s2 to reach a speed of 12 m/s. How long does it take for the acceleration to occur?
2s
Energy due to an object's motion
kinetic energy
the momentum before and after a collision remains constant
law of conservation of momentum
Calculate the force between two touching grapefruits each with a radius of 0.08 meters and a mass of 0.45 kilograms.
8 x 10^-11 N
transfer of energy by waves through empty space
radiation
An object at rest remains at ret, and an object in motion continues in motion with constant velocity unless the object experiences a net external force.
Newton's first law
If you stomp on the ground with a force of 175 N downward, with what force does Earth push upward?
175N
A collision in which kinetic energy is not conserved
inelastic collision
It will decrease
In an isovolumetric process what stays constant?
volume
A box takes 350 N to start moving when the coefficient of static friction is .35. What is the weight of the box?
1000N
How much power does it take to lift 30.0 N 10.0 m high in 5.00 s?
60.0 W
A 0.105-kg hockey puck moving at 48 m/s is caught by a 75-kg goalie at rest. With what velocity does the goalie slide on the ice after catching the puck?
0.067 m/s
In what direction does centripetal force act?
Towards the center of a circle
A slow process in which an object does work on its surroundings while slowly absorbing heat.
Isothermal process
A sniper is shooting at a target 1 km away horizontally. The bullet hits the target 50 cm below the aiming point. What is the bullet’s time of flight?
0.3 s
The sum of kinetic and potential energy
Mechanical energy
A 0.50-kg ball traveling at 6.0 m/s collides head-on with a 1.00-kg ball moving in the opposite direction at a velocity of -12.0 m/s. The 0.50-kg ball moves away at -14 m/s after the collision. Find the velocity of the second ball.
-2.0 m/s
How does gravity change if you increase your distance by 2x
The gravity decreases by 1/4
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.
460 J / kg C