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Questions in physics

[Free] Nuclear power plants require a lot of water to operate. Please select the best answer from the choices provided.

[Free] A charged particle moves at 2.5 × 10⁴ m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 × 10⁻² T. If the magnetic force is 7.5 × 10⁻² N, what is the magnitude of the charge? Options: A) 3.7 × 10⁻⁵ C B) 4.1 × 10⁻⁵ C C) 8.8 × 10⁻⁵ C D) 1.0 × 10⁻⁴ C

[Free] Which natural phenomenon is the best example of periodic behavior? A. The amount of pollution in Los Angeles as a function of time B. Your average daily bank balance C. The population of a city over time D. The high temperature for a given city

[Free] Why is a coffee cup dropped on a tile floor more likely to break than an identical cup dropped on a carpeted floor? a. Carpet is softer than tile so it absorbs the momentum. That reduces the force on the cup. b. The cup takes longer to stop when it hits carpet. That reduces the force on the cup. c. Carpet absorbs energy better than tile. That reduces the force on the cup. d. The cup is less likely to bounce when it hits carpet. That reduces the force on the cup.

[Free] Which of the following is not a potential benefit of using more nuclear energy? A. Fuel is easy to move, so there is less pollution from shipping B. More air pollution C. Proper control can ensure safe handling D. Cost of fuel is very low

[Free] For water to be a liquid, its temperature must be within 50 Kelvin of 323 Kelvin. Which equation can be used to determine the minimum and maximum temperatures between which water is a liquid? [tex] |323-50|=x [/tex] [tex] |323+50|=x [/tex] [tex] |x-323|=50 [/tex] [tex] |x+323|=50 [/tex]

[Free] 1. What is friction? 2. On what principle do ball bearings work? 3. How does lubrication reduce friction? 4. An object is moving from north to south. What is the direction of the force of friction on the object?

[Free] What can humans do to survive as a species if we are not successful in stopping the negative changes occurring on planet Earth?

[Free] Which is a valid velocity reading for an object? A. 45 m/s B. 45 m/s north C. 0 m/s south D. 0 m/s

[Free] Select the correct answer. Julie is cycling at a speed of 3.4 meters/second. If the combined mass of the bicycle and Julie is 30 kilograms, what is the kinetic energy? A. $1.7 \times 10^2$ joules B. $1.5 \times 10^2$ joules C. $2.0 \times 10^2$ joules D. $2.2 \times 10^2$ joules