Work and Power
A weightlifter lifts a set of weights a vertical distance of 1.5 m. If a constant net force of 400 N is exerted on the weights, what is the work done on the weights? INCLUDE UNITS!!
600 Joules
What is the kinetic energy of a bicycle that has a mass of 16 kg and is moving at a velocity of 4 m/s?(INCLUDE UNITS)
128 joules
The average kinetic energy of the particles in a substance is known as
Temperature
What three variable does Ohm's law relate? And what is each variables units?
V = voltage difference (volts)
I = current (Amperes)
R = resistance (ohms)
What is one way you can increase the strength of an electromagnet?
Increase the number of loops
Increase the current
A car engine performs 3,500 J of work in 4 seconds. What is the power output of the
engine? INCLUDE UNITS!
875 Watts
What is the potential energy of a 7 kilogram ball that is on the ground?
The total kinetic energy of particles in a substance is known as
Thermal Energy
What is the current produced by a voltage of 350 V through a resistance of 0.2 ohms?
1750 Amperes
How does the magnetic force between two magnets change as the distance between the
magnets increases?
decreases
What force is needed to move a barrel 25m if 225 J of work are accomplished? INCLUDE UNITS!
9 Newtons
A 4 kg rock is at the edge of a cliff 35 meters above a lake. It becomes loose and falls toward the water below. Calculate its potential and kinetic energy before it falls when it is at the top of the cliff.
PE = 1372 Joules
KE = 0 Joules
Macaroni rises and falls in a pot of boiling water. What type of heat transfer is occurring within the water to cause this movement?
Convection
What resistance would produce a current of 240 amps from a 8-V battery?
0.03 ohms
Where is the magnetic force of a magnet the strongest?
at the poles
A machine exerts 40000 W of power to complete a task in 25 seconds. How much work
does the machine do? INCLUDE UNITS!
1,000,000 Joules
If a 0.18 kg apple has 2 J of potential energy, how far is it off the ground?
1.13 m
On a sunny day, the sand at the beach becomes hot to the touch. Which form of heat transfer is primarily responsible for heating the sand?
Radiation
A circuit has a current of 2 amperes and a resistance of 3 ohms, What is the circuits voltage?
6 Volts
The process of a changing magnetic field inducing an electric current in a current carrying wire is known as:
hint: how generators create electricity
Electromagnetic Induction
A cyclist exerts 500 W of power while pedaling. If they apply a total of 4500 J of work, how long did they exert this effort? INCLUDE UNITS!`
9 seconds
What is the velocity of a 500-kilogram elevator that has 4,000 joules of kinetic energy?
4 m/s
A person places their hand on a cold windowpane and feels the chill. What type of heat transfer is occurring between the hand and the
window?
Conduction
Draw a simple electric circuit, with a battery, a switch and a light bulb. And label the direction of the electric current and the direction of electron flow in the circuit.
See teacher
What type of energy is input into a generator that allows it to generate electric current?
Mechanical energy