||Homework Help||Kindergarten-University. - Page 50

Originally posted by: -Ayeshaa-

^ thank you so much:)

Two bowling balls each have a mass of 6.8kg. They are placed next to one another with their centres 21.8cm apart. What gravitational force do they exert on each other?

^ For that do I use the formula Fg = Gm1m2/d^2

Originally posted by: -Ayeshaa-

T = 2 pi V(L/g)
Squaring both sides,
T^2 = 4 pi^2 L/g
g = 4 pi^2 L/T^2

For this, for the squaring part, you squared the L and G and pi? You squared them altogether? So didn't have to divide by pi to get rid of it?

Determine displacement of a plane that is uniformly accelerated from 66m/s to 88m/s in 12s.

^ Displacement formula confuses me, I think I'm supposed to use this one: d = v1+ v2/2 *t

Your new motorcycle weighs 2450N. What is its mass in kilograms?

^ For this would I use the formula Fg = mg. 2450 = m(9.81) divided both sides by 9.81 and I got 250kg.

If you use a horizontal force of 30.0N to slide a 12.0kg wooden crate across a floor at a constant velocity, what is the coefficient of sliding friction between crate and floor? I can't make that upside down h thing for the coefficient symbol, so I'm just gonna use h.

^ Ff = hFN Would this be the formula I would use to solve this problem?

The maximum force a grocery bag can hold up and not rip is 250 N. If 20kg of groceries are lifted from the floor to the table with an acceleration of 5m/s^2, will the bag hold? I have the formula Fnet = ma on my sheet, so would I use it to solve this?

A sprinter with a mass of 76kg accelerates from 0 to 9.4m/s in 2.8s. Find the average force acting on the runner. I don't get how to do this, am I supposed to use the formula p = mv2-mv1.

A student librarian picks up a 22-N book from the floor to a height of 1.25m. He carries the book 8.0m to the stacks and places the book on a shelf that is 0.35m high. How much work does he do on the book? W = fd?

A 95kg fullback, running at 8.2m/s collides in midair with a 128kg defensive tackle moving in the opposite direction. Both players end up with zero speed. <-- I seriously hate momentum questions, please explain how to do this.

A. What was the fullback's momentum be4 the collision?

B. What was the change in the fullback's momentum?

C. What was the change in the tackle's momentum?

D. What was the tackle's original momentum?

E. How fast was the tackle moving originally?

Thanks so much for the help above Akhl :)

For the grocery bag problem, could I know what Fapp stands for?

Originally posted by: -Ayeshaa-

For the grocery bag problem, could I know what Fapp stands for?

^ thanks so much Akhl :)