how much force does the motor of an elevator need to exert to hold a 1000 kg elevator still if the counterweight weighs 7000 newtons?

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