# Search results

1. ### Can't find normal and tension force

i have two problems here where i have to find individual forces. problem 1: i can't find the normal force. how would i do it? <img src=http://img1.photobucket.com/albums/0903/badboyben03/p01.png> [Broken] i tried 2123.328N *(2825.008-701.68) and also tried 701.68N but neither of them...
2. ### Circular Motion

how do you convert it?
3. ### Circular Motion

1.1 rev/s is not the velocity right?
4. ### Circular Motion

An athlete whirls a 6.50-kg hammer tied to the end of a 2.0-m chain in a horizontal circle. The hammer moves at the rate of 1.1 rev/s. What is the centripetal acceleration of the hammer? What is the tension in the chain?
5. ### Can someone check this?

a 70 kg box s pulled by a 400 N force at an angle of 30 degrees to the horizontal. The force of kinetic friction is 75 N. determine the acceleration. heres what i did first i found the x-component using (686)sin30 and it comes out to be 343. Then i use the formula where the sum...
6. ### Help with Momentum

The velocity of a 620-kg auto is changed from +11.0 m/s to +48.0 m/s in 66.0 s by an applied, constant force. What change in momentum does the force produce? What is the magnitude of the force?
7. ### Forces in 2-d

if an object is in equilibrium, then which of the following must be true? (i know net force has to be 0, forces are balanced, and acceleration is 0. it doesn't always mean it is at rest. i think there's still one or two more "must be trues" in the list.) a. all individual forces acting...
8. ### Forces in 2-d

if an object is in equilibrium, then which of the following must be true? (i know net force has to be 0, forces are balanced, and acceleration is 0. it doesn't always mean it is at rest. i think there's still one or two more "must be trues" in the list.) a. all individual forces acting...
9. ### Which are true?

which ones are true? a. the mass of an object on the moon will be the same as its mass on Earth. b. the weight of an object on the moon will be the same as its weight on Earth. c. the mass and weight of an object are the same thing d. the weight of an object is the force of gravity...
10. ### Which are true?

which ones are true? a. the mass of an object on the moon will be the same as its mass on Earth. b. the weight of an object on the moon will be the same as its weight on Earth. c. the mass and weight of an object are the same thing d. the weight of an object is the force of gravity...
11. ### Question w/ work and friction

Sally applies a horizontal force of 520 N with a rope to drag wooden crate across a floor with a constant speed. The rope tied to the crate is pulled at an angle of 84.5° How much force is exerted by the rope on the crate and what work is done by the floor through force of friction between...
12. ### What force will be needed to start the sled moving?

thanks again! do you have AIM?
13. ### What force will be needed to start the sled moving?

yeah yeah i figured that one out later on, but thanks anyway
14. ### What force will be needed to start the sled moving?

thanks! A force of 45 N accelerates a 6.0-kg block at 7.0 m/s2 along a horizontal surface. How large is the frictional force and what is the coefficient of friction?
15. ### What force will be needed to start the sled moving?

thanks thanks. do you think you can help me w/ my last problem?
16. ### What force will be needed to start the sled moving?

i need help with figureing out this problem A sled of mass 57 kg is pulled along snow-covered, flat ground. The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. What force will be needed to start the sled moving? Once moving, what total force must be...

sorry yeah
18. ### I with a formula

oops oh, I am sorry. maybe i should've been more specific. If I was just givin the force, the mass and acceleration. I'm not given the coefficient of friciton or the frictional force.
19. ### I with a formula

coefficients how do i find the coefficient of frcition?
20. ### I with a formula

what formula do i need to solve this problem? A sled of mass 57 kg is pulled along snow-covered, flat ground. The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. What does the sled weigh?
21. ### Find the acceleration of the elevator.

after i find the mass of the person? wut do i have to do?
22. ### Find the acceleration of the elevator.

how can i find the answer w/o knowing the mass? A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 818 N. As the elevator moves up, the scale reading increases to 950 N, then decreases back to 818 N. Find the acceleration of the elevator.
23. ### Formula help

im pretty sure i get the hang of it, thanks. BUT what if all they give me is force? how do i find the acceleration w/o the mass?

82859?
25. ### Formula help

ooo yeah i think i can get it now. let me try
26. ### Formula help

i kinda do. imma have to probably get a tutor. i don't really get what my teacher is saying, but why is the answer I am getting wrong? i got 37240N as the answer.
27. ### Newtons 3rd law

can someone explain to me Newton's thrid law of motion?
28. ### Formula help

but some other person is telling me the answer i got is wrong.
29. ### Formula help

cuz the acceleration is proportonal to the magnitude or something of the force. same goes w/ mass.
30. ### Formula help

net force equals the mass and aceleration.
31. ### Formula help

so i should multiply 4655 and 8 together?
32. ### Formula help

can someone give me the formula needed to work this problem? A 4655-kg helicopter accelerated upward at 8 m/s2. What lift force is exerted by the air on the propellers?
33. ### Finding mass and weight

whoops never mind...i had to read it a second time, sorry. i got it now.
34. ### Finding mass and weight

If I am given the the weight of someone at 91 kg, and he's on a place that's (g=9.782m/s/s), i know to the weight (N), i multiply the 91kg and 9.782 m/s/s, but how do you find the mass of him in kg?
35. ### Help with force

can someone give me the formula needed to do this problem? "a karate strike hits wooden blocks, the hand undergoes an acceleration of -6500 m/s2. Medical data indicates the mass of the forearm and hand to be about 0.8 kg. What is the force exerted on the hand by the blocks?" am i supposed...
36. ### What is the force exerted on the hand by the blocks?

can someone give me the formula needed to do this problem? "a karate strike hits wooden blocks, the hand undergoes an acceleration of -6500 m/s2. Medical data indicates the mass of the forearm and hand to be about 0.8 kg. What is the force exerted on the hand by the blocks?" am i supposed...
37. ### Projectile Stone Off Cliff question

hmmm ummm...before you talk **** about me, i just want to let you know this isn't my homework. i haven't learned this yet. I am still on acceleration and velocity...so yeah.
38. ### Projectile Stone Off Cliff question

hi what does g and h stand for?
39. ### Projectile Stone Off Cliff question

A stone is thrown horizontally at 14.0 m/s from a cliff 75.7 m high. How far from the base of the cliff does the stone strike the ground?