Kinematics and Forces
Work, Energy, Power
Momentum
Electricity
Light/Optics
100
Why do action-reaction pairs not cancel each other out?
They act on different objects.
100
What does it mean for a system to be closed?
No external forces act on the system.
100
Why is it important to wear a seat belt in a car?
The seat belt increases the time it takes for the passenger to come to a stop, which decreases the force acting on the passenger.
100
A total charge of 100 Coulombs flows past a fixed point in a circuit every 500 seconds. What is the current at this point in the circuit?
0.2 A
100
What is the law of reflection?
The reflected angle will equal the angle of incidence.
200
Two objects gravitationally attract with a force of 18.0 N. If the distance between the two object's centers is doubled, then what is the new force of attraction?
4.5 N
200
A pop-up toy is compressed with some amount of force. It then launches upwards before falling back down to the ground. What energy transformations are taking place?
Us-->K-->Ug-->K
200
What is the difference between an inelastic collision and an elastic collision?
In an elastic collision, both momentum and kinetic energy are conserved, while in an inelastic collision only momentum is conserved.
200
In an electric circuit, what is a source of potential difference?
A battery!
200
Which characteristic is the same for every color of light in a vacuum?
speed
300
Mango the bird accelerates uniformly from rest to a speed of 4m/s over a distance of 30.7m. Determine Mango’s acceleration.
0.26 m/s2
300
A wild goose, with a mass of 3.0 kg is observed flying at a speed of 11.0 m/s and at an altitude of 18m above the Earth’s surface. What is the total energy of the bird?
710.7 J
300
A 0.50 kg object is moving with a velocity of 10 m/s. A force is applied to the object, changing its velocity to 20 m/s over 2 s. What is the impulse delivered to the object?
10 kgm/s
300
If resistor R2 was removed, what would happen to the potential difference across R1?
Nothing! The voltage drop across R1 would still be 24 V.
300
What is the condition for total internal reflection to occur?
Light must be traveling from a more dense material to a less dense material (n1 > n2).
400
A child kicks a ball with an initial velocity of 8.5 m/s at an angle of 35° with the horizontal, as shown in the diagram below. The ball has an initial vertical velocity of 4.9 m/s and a total time of flight of 1.0 s. (Neglect air resistance). What is the horizontal component of the ball's initial velocity?
6.96 m/s
400
Sammie does 340 J of work when exerting a force of 35 N on an object. What is the displacement that the object experiences?
9.71 m
400
Block A is moving east towards block B (mB = 5.5 kg) which is moving west at a speed of 3.8 m/s. Block A has a mass of 3.4 kg and a speed of 2.3 m/s. Block A collides with block B and they move together in a totally inelastic collision. Find the post-collision velocity of the two-block system.
1.47 m/s west
400
Two 5 Ω resistors have an equivalent resistance of 2.5 Ω when connected in parallel an electric circuit with 24.0 V battery. What is the total current in this circuit?
9.6 A
400
An object 3.4 cm high is placed near a concave mirror of magnification 5.6. Determine the height of the image. Write your answer in picometers.
1.904 x 1011 pm
500
A football player hits a 75 kg training sled with 200 N of force applied parallel to the ground. The coefficient of static friction, µs, is 0.20 and the coefficient of kinetic friction is 0.15. Does the sled move?
Yes!
500
A spring-loaded toy gun is pointed upward and fires a 0.055 kg projectile. If the spring constant of the toy is 950 N/m and is compressed 0.030 m what is the maximum height the projectile will reach?
0.79 m
500
A 34,000 kg train car is traveling at 12 m/s toward another 34,00 kg stationary train car. After the two cars collide, they couple together and move along at 6 m/s. How much kinetic energy was lost in this collision?
1.22 x 106 J
500
Three resistors (R1 = 1.9 kΩ, R2 = 2.4 kΩ, and R3 = 4.2 kΩ) are connected in series. The total current in the circuit is 6 mA. Determine the voltage drop across R3.
25.2 V
500
A light ray travels from an unknown material with an index of refraction of 1.42 into air (n = 1.00). Determine the critical angle for total internal reflection to occur. Round to the nearest angle.
45 degrees