Exam Review

At a circus, a clown of mass 100. kilograms is fired horizontally at 15 meters per second from a cannon of mass 500. kilograms. What is the recoil speed of the cannon, to the nearest m/s?

• 30 m/s

• 3 m/s

• 5m/s

• -50m/s

A spring is compressed between two stationary blocks as shown in the diagram below.



Block A has a mass of 6.0 kilograms. After the spring is released, block A moves west at 8.0 meters per second and block B moves east at 16 meters per second. What is the mass of block B, in kg to the nearest tenth?

• 3m/s

• 5m/s

• 10m/s

• 15m/s

Thousands of perpetual motion machines have been submitted to the US Patent Office but all have been rejected. Which is the best explanation as to why?

• There is always friction on Earth so some mechanical energy is lost and kinetic energy cannot be maintained

• Energy cannot be conserved.

• There are too many successful designs

• Two of these

Which of the following is the best example of kinetic energy being transformed into potential energy?

• winding a grandfather clock

• bending a paper clip

• coasting down hill on a bicycle

• starting an automobile engine

Which of the following would be most helpful for a student to consider when trying to classify materials as conductors or insulators?

• Whether the materials tend to gain or lose electrons

• Whether the materials are dull or shiny

• How freely a charge moves through the materials

• How magnetic the materials are when charged

According to accepted atomic models, metals are good conductors because their atoms have which of the following?

• Negative electrons that are attracted to positive protons

• More electrons than protons

• Unstable nuclei that emit electrons

• A number of valence electrons that can move easily

Which of the following best classifies a material that has extremely low conductivity?

• Semiconductor

• Conductor

• Insulator

• Metalloid

A student creates a parallel circuit that has three branches. The student places a resistor on each branch of the circuit so that each path has only one resistor. The student collected some of the electrical measurements in the circuit and recorded them below.

Based on the information above, which values should replace the A, B, and C in the Student Circuit Data table?

• A = 3 Ohms, B = 4.5 Amps, and C = 24 Volts

• A = 9 Volts, B = 9 Ohms, and C = 3 Amps

• A = 9 Ohms, B = 4.5 Amps, and C = 3 Volts

• A = 3 Volts, B = 9 Ohms, and C = 24 Amps

An electric circuit is shown in the diagram below.

What is the current in ammeter A, in amps?

• 3amps

• 5 apms

• 10 amps

• 15amps

A lamp operates at 10 volts and draws a current of 0.5 ampere for 60 seconds. What power is developed by the lamp?

• 5 wats

• 30 watts

• 300 watts

• 600 watts