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Questions in physics

[Jawaban] The energy required to lift two skiers to the top of the mountain is 240,000 J. The electric motor has an efficiency of 40%. Calculate the energy wasted in the motor.

[Jawaban] The moon's mass is [tex]7.34 \times 10^{22} \, \text{kg}[/tex] and it is [tex]3.8 \times 10^{8} \, \text{m}[/tex] away from Earth. Calculate the gravitational force of attraction between the Earth and the moon.

[Jawaban] What is the primary force that causes the seafloor to spread and continents to drift?

[Jawaban] Why is chemical energy a part of all chemical reactions?

[Jawaban] Which of the following describes work? A. Energy acts on an object. B. Force acts on an object. C. Force acts on an object and causes a displacement of that object. D. Friction only acts on an object and causes a displacement of that object.

[Jawaban] Two bowling balls each have a mass of 6.9 kg. They are located next to each other with their centers 21.8 cm apart. What gravitational force do they exert on each other?

[Jawaban] What is a vector quantity? What are two examples of vector quantities?

[Jawaban] What is the angle between a rigid object and the force applied to it that yields torque, using the equation [tex]T = Fd[/tex]?

[Jawaban] Which statement correctly describes a chemical reaction? A. Reactants come out of a reaction. B. Energy is always released. C. Bonds between atoms break and new bonds form. D. Products go into a reaction.

[Jawaban] Which of the following has more inertia? A. Bowling ball B. Hammer C. Tennis ball D. Feather