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Questions in physics

[Homework Help] Which of the following universal forces is the weakest? A) electric B) gravitational C) magnetic D) strong nuclear (Note: Gravitational force is the weakest among the universal forces.)

[Homework Help] What environmental factors affect kinetic energy and diffusion?

[Homework Help] If a plane can travel 450 miles per hour with the wind and 410 miles per hour against the wind, find the speed of the plane without wind and the speed of the wind.

[Homework Help] A stack of eight compact disks is 1.0 centimeter high. 1. What is the thickness of one compact disk (CD) in centimeters? 2. What is the thickness of one CD in millimeters?

[Homework Help] A 12-tooth gear is turned two times. How many times will the connected 24-tooth gear turn?

[Homework Help] You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

[Homework Help] An object is thrown horizontally from the open window of a building. If the initial speed of the object is 20 m/s and it hits the ground 2.0 s later, from what height was it thrown? (Neglect air resistance and assume the ground is level.)

[Homework Help] If the same net force is applied to a 7 kg object and a 21 kg object, which of the following is true? A. The 21 kg object accelerates three times faster than the 7 kg object. B. The 7 kg object accelerates three times faster than the 21 kg object. C. Both objects accelerate at the same rate because the force is the same. D. Neither object will accelerate because there is a net force on the objects. What is the acceleration due to gravity on Mars?

[Homework Help] Which of the following statements about ice melting is true and why? A. Energy flows from the ice to its surroundings. B. Water molecules move from their fixed position. C. Water molecules lose energy. D. The temperature of the ice increases as it melts.

[Homework Help] How much work is done on a 60 N box of books that you carry horizontally across a 6 m room?