Motion and Forces
What is the speed of an object that travels 18 meters and then back in 12 seconds? What is the velocity of the same object?
3 m/s
0 m/s
How much work is being done if a person pushes a 60 N box 5 meters?
300 J
What is the momentum of an 8 lb dumbbell thrown up into the air at 2.6 m/s? Neglect air resistance.
9.43 kg⋅m/s
What is the charge of an electron?
-1.6 × 10-19 C
A 20 C charge ran through an object for 3 seconds. What is the current?
6.67 A
A car on the freeway has travelled 2 miles in 118 seconds. What is the car's velocity over this period of time in meters per second (m/s)?
27.28 m/s
2600 J of work is being done in 5 seconds. What is the power output?
520 W
A 1800 kg car is driving on a freeway on a snowy day. The speed of the car is 29 m/s. After 5 hours, 240 kg of snow has accumulated on the car, and the car has now sped up to 32 m/s due to a halt in the snowstorm. Calculate the impulse of the car.
13080 kg⋅m/s
What is the charge of an atom?
neutral
A battery of 12 V and a 2 Ω resistor are connected to a light. What is the current running through the light?
6 A
An object is travelling at 22 m/s and slows down to 6 m/s in 2 seconds. What is the acceleration of the object?
-8 m/s2
An object of mass 29 kg is accelerating at 12 m/s2. If it travels 8 meters, how much work was being done to the object?
2784 J
If the momentum of the NASA space shuttle as it leaves the atmosphere is 3.75 × 108 kg⋅m/s, and its mass is 75000 kg, what is its velocity?
5000 m/s
What is the region around a charged particle that exerts a force on another charged particle called?
electric field
What is the total resistance of three resistors (3 Ω, 5 Ω, 8 Ω) connected in parallel?
1.52 Ω
A 500 N force is applied to an object that weighs 48 kg. What is the acceleration of the object?
10.42 m/s2
A 1400 kg car travelling at 111 km/h speeds up to 123 km/h in 3 seconds on a highway. What is the power of the car?
50555.56 W
A football player runs at 8 m/s, and accidentally runs into an 80 kg referee standing on the field. This causes the referee to fly forward at 7 m/s. If the player came to a complete stop as a result of the collision, what is the mass of the player? Assume the collision is perfectly elastic.
70 kg
What are the three ways matter can become charged?
DAILY DOUBLE:
A charge of 19 C runs through a battery for 3 seconds. If a 8 Ω resistor is connected to the battery, what is the voltage of the light connected to the battery?
50.67 V
A car that has a mass of 1200 kg is accelerating at 9 m/s2. If the coefficient of friction is 0.24, how much force was applied to the car?
13625.28 N
At the most popular amusement park in town, the scariest roller coaster is 180 m tall, and a car in the roller coaster is 500 kg.
1. Calculate the potential energy at the highest point.
2. How fast is the roller coaster car going at the lowest point?
3. Calculate the speed of the roller coaster car at a point when the roller coaster is at 100 m and descending.
4. Calculate the speed of the roller coaster car at a point when the roller coaster is at 70 m and descending.
1. 882900 J
2. 59.43 m/s
3. 39.62 m/s
4. 46.46 m/s
DAILY DOUBLE:
Two blocks moving in opposite directions collide and stick together. The first block weighs 1 kg and is moving to the right at 8 m/s. The second block weighs 2 kg and is moving to the left at 1 m/s. What is their combined speed and direction after the perfectly inelastic collision?
2 m/s to the right
A wire has an electric potential energy of 18 J. A current (3 A) runs through the wire for 2 seconds. What is the electric potential?
3 V
A series of resistors are connected to a 62 V battery. Three resistors (4 Ω, 7 Ω, 12 Ω) are connected in parallel, and this system of resistors is then connected in series with a 9 Ω resistor. What is the current running through the battery?
5.59 A