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Questions in physics

[Done] Since the Wagon is being pulled down hill is it increasing (C)

[Done] How does air resistance affect the velocity of a falling object?

[Done] Describe two ways to change the frictional force between two solid surfaces.

[Done] A small child has a wagon with a mass of 10 kilograms. The child pulls on the wagon with a force of 2 newtons. What is the acceleration of the wagon?

[Done] The density of mercury is 13.6 g/mL. What is the volume of a 155-gram sample of mercury?

[Done] How is a euglena like a plant cell? How is it like an animal cell? Like a plant cell: Like an animal cell:

[Done] Mr. Knote, a piano tuner, taps his 440 Hz tuning fork with a mallet. What is the period of the vibrating fork?

[Done] If Earth were twice as far from the Sun, the force of gravity attracting the Earth to the Sun would be a. twice as strong b. half as strong c. one-quarter as strong Can someone explain this one for me?

[Done] Which would best reduce the amount of energy needed to pull a wagon up a ramp? 1. Increasing the slope of the ramp 2. Reducing the friction between the wagon wheels 3. Reducing the length of the wagon handle 4. Increasing the friction between the wagon wheels

[Done] A dart is thrown horizontally with an initial speed of 10 m/s toward point P, the bull's-eye on a dartboard. It hits at point Q on the rim, vertically below P, 0.19 s later. (a) What is the vertical distance between points P and Q? (b) How far away from the dartboard is the dart released?