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Questions in physics

[Answered] 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?

[Answered] 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.)

[Answered] 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?

[Answered] 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.

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

[Answered] Explain why dogs pant during hot summer days using the concept of evaporation.

[Answered] A person walks out of a store with a pillow at the top of an overflowing shopping cart. While walking to the car, the cart's wheel hits a large rock, causing the cart to suddenly stop. Which of the following is likely to happen as a result of Newton's first law of motion? A. The pillow will fall off the cart. B. The cart will move backwards. C. The person will stumble forward. D. The cart will tip over.

[Answered] What actions did Japan take in an attempt to recover from the Great Depression?

[Answered] Which plate is covering most of two continents? What are the two continents?

[Answered] Explain why ultra-high voltages are used to carry electricity over transmission lines.