An acorn falls from rest from the top of a 21 m tall oak tree. A. How long does it take for the acorn to fall to the ground? B. How fast is the acorn going before it hits the ground?

Write an expression to evaluate the relative error in g (given that g = 2h/t^2) in terms of h,Δh, t,Δt

When you hold a small amount of sodium chloride in a flame, you observe that the flame is bright yellow. What can you do to be sure that the color is due to sodium and not chlorine?

What is the mass of a 196 n block

In comparison to radio waves, visible light has: A. wavelengths that are equal. B. frequencies that are equal. C. a speed that is faster. D. wavelengths that are shorter. E. wavelengths that are longer.

How do eyepieces with the smallest focal lengths change a telescope's overall magnification?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?

A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, while that of the vacuum cleaner is 5.7 A. Determine the power consumed by (a) the blow-dryer and (b) the vacuum cleaner.

4. A 40 kg child and a 30 kg child want to balance themselves on a 4 meter, 50 kilogramn see-saw. Where should the fulcrum be placed?

A 2-kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity