Momentum
A Hellcat has a mass of 2000 kg, an acceleration of 7.5 m/s2, a force of 15,000 Newtons and a top speed of 90 m/s. What is the momentum of the Hellcat at top speed?
180,000 kg*m/s
A 24 V batter is connected to three resistors in series (4Ω , 6Ω , 10Ω ). What is the total current of the circuit?
1.2 A
Two point charges exert an electric force on each other. What happens to the force if the distance is trippled?
What kind of device converts electrical energy into mechanical energy?
A motor
Which ball would hurt more assuming that they both have the same time of impact? A 1 kg baseball thrown at 10 m/s or a 6 kg bowling ball rolled at 2 m/s?
The bowling ball
An egg with a mass of 0.06 kg hits the ground at 4.2 m/s. If the impact lasted 0.01 second, what was the force of the impact?
25.2 Newtons
A 12 V battery is connected to two resistors in parallel (8Ω and 12Ω). What is the total resistance of this circuit?
4.8 Ω
Two point charges are one millimeter away from each other. If I quadruple the charge of both charges, how will the electric force change?
The electric force will increase by a factor of 16x
What device turns mechanical energy into electrical energy?
Generator
How do airbags save lives?
Airbags increase the time of impact of a collision, reducing the experienced force.
What is the impulse of a 3000 kg truck that slows from 20 to 10 m/s?
-30,000 Newtons
A 12 Volt battery powers a single resistor of 3Ω. What is the power dissipated by the resistor?
48 Watts
A small metal sphere with a charge of –6 μC is brought into contact with a second identical metal sphere that has a charge of +2 μC. The spheres are then separated. If both spheres have the same charge after contact, what is the charge on both spheres?
-2 μC
Which device has more turns in the primary coil than in the secondary coil, resulting in a lower output voltage?
Why does a balloon "stick" to a wall after rubbing it on hair?
The negative balloon polarizes the wall, causing electrons in the wall to move away from the balloon leaving an attractive force with the protons.
When playing miniature golf, a 0.3 kg putter hits a motionless golf ball with a velocity of 1.5 m/s. Assuming the putter has a perfectly elastic collision with the 0.04 kg golf ball, how fast will the golf ball move after contact?
11.25 m/s
A combination circuit with an 18 V battery is connected in series with a 3 Ω resistor and in parallel with a 6 Ω and 12 Ω resistor. What is the total current of this circuit?
2.6 A
Two charges are placed 0.20 m apart:q1 = +4.0×10 -6 C and q2 = −2.0×10-6 C. What is the magnitude of the electric force?
1.8 N
Which type of transformer has more turns in the secondary coil than in the primary coil, resulting in an increase in voltage?
A step-up transformer
What happens to the brightness of light bulbs as more bulbs are added in series?
The current decreases, therefore decreasing the brightness of the bulbs.
A drunk driver gets in to a head on collision with an 8,000 kg semi-truck traveling north at 5 m/s. Assuming that the drunk driver is in a Nissan Altima (1,500 kg) traveling south at 10 m/s, what is the speed and direction of the resulting inelastic collision?
2.6 m/s north
A 24 V batter is connected to three resistors in series (4Ω , 6Ω , 10Ω ). What is the voltage drop through the 4Ω resistor?
4.8 V
Two point charges are placed in air with a q1 = 3.0 x 10 -6 C and q2 = 5.0 x 10 -6. If they repel each other with a force of 2.7 Newtons, how far away are they from each other.
0.22 meters
A transformer has an input voltage of 100 V. The primary coil has 20 turns, and the secondary coil has 50 turns. What is the output voltage?
250 Volts
Why does a circuit breaker open a circuit when too much current is flowing through it?
Opening a circuit causes electrons to stop moving, preventing a possible electrical fire.