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A car accelerates uniformly from 20 m/s, covering 750 m in 30 seconds. What is its acceleration?
A car accelerates uniformly from 20 m/s, covering 750 m in 30 seconds. What is its acceleration?
For an object on an incline, the normal force is always equal to the object's weight.
For an object on an incline, the normal force is always equal to the object's weight.
False (B)
A 5 kg mass moving east at 10 m/s collides head-on with a 15 kg mass moving west at 3 m/s. If they stick together, what is the magnitude of their final velocity?
A 5 kg mass moving east at 10 m/s collides head-on with a 15 kg mass moving west at 3 m/s. If they stick together, what is the magnitude of their final velocity?
$0.25 m/s$
The force experienced by an object on a circular path is known as the ______ force.
The force experienced by an object on a circular path is known as the ______ force.
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Match the following terms with their correct units:
Match the following terms with their correct units:
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A cannon fires a shell at 400 m/s at a 20° angle. What is the initial vertical component of the velocity?
A cannon fires a shell at 400 m/s at a 20° angle. What is the initial vertical component of the velocity?
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The magnetic field strength is directly proportional to the distance from a current-carrying wire.
The magnetic field strength is directly proportional to the distance from a current-carrying wire.
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A 40 kg mass is initially moving at 5 m/s. A 5 N force acts on it for 20 seconds in the direction of the motion, what is the final momentum of the mass?
A 40 kg mass is initially moving at 5 m/s. A 5 N force acts on it for 20 seconds in the direction of the motion, what is the final momentum of the mass?
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A wire carrying a current experiences a force when placed in a magnetic field. If the wire is 9 cm long, carries a current of 3 A, and is placed in a 0.7 T magnetic field at an angle of 41 degrees, what is the magnitude of the force felt by the wire?
A wire carrying a current experiences a force when placed in a magnetic field. If the wire is 9 cm long, carries a current of 3 A, and is placed in a 0.7 T magnetic field at an angle of 41 degrees, what is the magnitude of the force felt by the wire?
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The earth's radius is approximately 6400 km, and a satellite orbiting at an altitude of 22 km above the surface has a speed lower than a satellite at a higher altitude.
The earth's radius is approximately 6400 km, and a satellite orbiting at an altitude of 22 km above the surface has a speed lower than a satellite at a higher altitude.
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A wire of a certain material has a resistance. What would happen to the resistance if the wire were made longer?
A wire of a certain material has a resistance. What would happen to the resistance if the wire were made longer?
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A spring bumper with a spring constant of 200 N/m is compressed by 40 cm. How much work is done in compressing the spring?
A spring bumper with a spring constant of 200 N/m is compressed by 40 cm. How much work is done in compressing the spring?
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The electric field between two parallel plates with a potential difference of 200 V separated by 4 cm is ______ V/m.
The electric field between two parallel plates with a potential difference of 200 V separated by 4 cm is ______ V/m.
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If a 60 kg boy is sitting on a 20 kg sled, and two people are pulling him with ropes, the net acceleration is found by only considering the forces applied by the people.
If a 60 kg boy is sitting on a 20 kg sled, and two people are pulling him with ropes, the net acceleration is found by only considering the forces applied by the people.
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Match the following values with their corresponding physical quantities related to a solenoid:
Match the following values with their corresponding physical quantities related to a solenoid:
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A giant pistachio is swung in a vertical circle. At what point in the circle is the tension in the string the greatest: the top or the bottom?
A giant pistachio is swung in a vertical circle. At what point in the circle is the tension in the string the greatest: the top or the bottom?
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The repulsive force between two charges is 3 x 10^-8 N when they are 10 cm apart. If the distance is increased to 40 cm, the new repulsive force will be ______ than the original force.
The repulsive force between two charges is 3 x 10^-8 N when they are 10 cm apart. If the distance is increased to 40 cm, the new repulsive force will be ______ than the original force.
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A proton with a speed of 4 x 10^4 m/s moves north through a magnetic field. If it experiences a force of 8 x 10^-14 N directed into the paper, what is the direction of the magnetic field?
A proton with a speed of 4 x 10^4 m/s moves north through a magnetic field. If it experiences a force of 8 x 10^-14 N directed into the paper, what is the direction of the magnetic field?
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What is the turn density of a solenoid that has 40 turns along its 20 cm length?
What is the turn density of a solenoid that has 40 turns along its 20 cm length?
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Match the scenario with the effect on the repulsive force between charges A and B:
Match the scenario with the effect on the repulsive force between charges A and B:
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If the separation between two charges is increased, the amount of work which must be done on the system to maintain the distance, will always be greater than if the distance was decreasing.
If the separation between two charges is increased, the amount of work which must be done on the system to maintain the distance, will always be greater than if the distance was decreasing.
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What is the relationship between the cost of electricity usage and the time an appliance is used for?
What is the relationship between the cost of electricity usage and the time an appliance is used for?
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If an electric oven draws 20 amperes across 240 volts, the oven uses 4800 watts of power.
If an electric oven draws 20 amperes across 240 volts, the oven uses 4800 watts of power.
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If the cost of electricity is $0.08/kWh, how much does it cost to run a 4800 W appliance for 4 hours?
If the cost of electricity is $0.08/kWh, how much does it cost to run a 4800 W appliance for 4 hours?
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Study Notes
Physics 40S WS Zanzibar - Review Questions
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Question 1: A car accelerates from 20 m/s to cover 750 meters in 30 seconds.
- Calculate the acceleration.
- Calculate the speed at the end of 30 seconds.
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Question 2: A jet accelerates from 100 m/s to 180 m/s at 8 m/s².
- Calculate the distance traveled.
- Calculate the time taken.
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Question 3: A 20 kg mass is on a 20° incline with a friction coefficient of 0.20. A 125 N force accelerates the mass up the incline.
- Calculate the normal force.
- Calculate the friction force.
- Calculate the net force.
- Calculate the acceleration.
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Question 4: A 40 kg mass moves at 5 m/s. A 5 N force acts in the direction of motion for 20 seconds.
- Calculate the impulse.
- Calculate the final momentum.
- Calculate the new speed.
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Question 5: A 5 kg mass (going east at 10 m/s) collides with a 15 kg mass (going west at 3 m/s). The masses stick together.
- Calculate the final velocity.
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Question 6: Two parallel wires (separated by 5 cm, each carrying 3 amperes of current, and each 8 m long)
- Calculate the force exerted by one wire on the other.
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Question 7: A cannon fires a shell at 400 m/s at a 20° angle above the horizontal.
- Calculate the time in the air.
- Calculate the horizontal distance traveled.
- Calculate the maximum height above the ground.
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Question 8: A straight wire with a current of 2.8 amperes.
- Calculate the magnitude of the magnetic field at a perpendicular distance of 5 mm from the wire (in Tesla).
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Question 9: A circular loop of conducting wire with a 5 mA current and a 9 cm diameter.
- Calculate the strength of the magnetic field at its center (in Tesla).
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Question 10: A 25 kg child on a merry-go-round (2.0 m from center) completes 12 revolutions in 60 seconds.
- Calculate the period and frequency.
- Calculate the centripetal acceleration.
- Calculate the centripetal force.
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Question 11: A 40 kg mass moving at 5 m/s on a frictionless surface is acted upon by a 20 N force at a 30° angle above the horizontal over 30 m.
- Calculate the work done.
- Calculate the new speed.
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Question 12: A 9 cm wire carrying 3 amperes in a 0.7 Tesla external magnetic field at 41 degrees.
- Calculate the force on the wire.
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Question 13: A horizontal spring bumper (200 N/m spring constant) is compressed 40 cm and a 4.0 kg mass is placed against it.
- Calculate the loading force.
- Calculate the loading work.
- Calculate the maximum speed.
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Question 14: A solenoid with 40 turns, 20 cm length, and 5 mA current.
- Calculate the magnetic field at the center.
- Calculate the turn density.
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Question 15: A 500 kg satellite at 22 km altitude above Earth's surface.
- Calculate the orbital speed.
- Calculate the orbital period.
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Question 16: Two point charges (4 µC at A and -6 µC at B, 30 cm apart)
- Calculate the electric field at B.
- Calculate the force on the charge at B.
- Calculate the electric potential at A.
- Calculate the potential energy of the system.
- Calculate the work to increase separation to 50 cm.
- Calculate the electric field midway between A and B.
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Question 17: Two parallel plates (separated by 4 cm and with a 200 V potential difference). An alpha particle is released from the positive plate.
- Calculate the electric field strength.
- Calculate the electric force on the particle.
- Calculate the work done accelerating the particle.
- Calculate the change in potential energy.
- Calculate the speed of the particle hitting the negative plate.
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Question 18: A proton with a speed of 4 × 10⁴ m/s experiences a force of 8 × 10⁻¹⁴ N directed into the paper while moving north through a magnetic field (θ = 90°).
- Calculate the magnitude and direction of B.
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Question 19: A 25 m wire (0.60 mm diameter) has a resistance of 12 Ω.
- Calculate the resistivity.
- Calculate the resistance of a 50 m wire with 0.30 mm diameter.
- Question 20: A 60 kg boy on a 20 kg sled is pulled by two forces (40 N [E 30° N] and 50 N [E 40° S]). -Calculate the acceleration.
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Question 21: A 6 kg pistachio is swung in a vertical circle (1.2 m string) at 25 m/s.
- Calculate the tension at the top and bottom of the circle.
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Question 22: Two point charges (q and 2q, initially 10 cm apart with a 3 x 10⁻⁸ N repulsive force)
- Calculate the new repulsive force if the charge on A is 3q.
- Calculate the new repulsive force if the distance is 40 cm.
- Calculate the new repulsive force if A is 5q, B is q/2, and distance is 10 mm.
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Question 23: An electric oven (20 amperes, 240 volts, 4 hours)
- Calculate the cost of electricity ($0.08/kWh).
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Description
Test your knowledge with these review questions focusing on key concepts in physics. Topics include acceleration, forces on inclines, impulse, and momentum. Perfect for Physics 40S students looking to reinforce their understanding and problem-solving skills.
