# Search results

1. ### Simple work question

A book is pushed up a ramp by a force. Calculate the net work done by : a. Fpush b. Fgrav c. Fnormal Let fnet = 5 newtons and displacement of the object be 5 m up the ramp, so the net work done by Fpush = 5 * 5 = 25 J. is the Work net by grav = mgsin@ * 5? and net work by Fnormal =...
2. ### Potential energy of this water were converted in to electrical energy

q. water flows over niagra falls which is 128m high at an average rate of 1.67e6 Kg/s. The acceleration due to gravity is 9.81. If half of the potential energy of this water were converted in to electrical energy how much power will be produced by these falls. Please help asap MY work...
3. ### Escape Velocity constant?

easy to say 5 mins, but how abt u actually think abt this question!! it says COnstant speed, that mean if a rocket has 100 m/s then it continues at that speed yet it escapes the gravitational field of a planet. DO U GUYZ THINK THIS IS A RELEVENT QUESTION FOR PROVINCIAL??? I DON'T, CAZ THE...
4. ### Escape Velocity constant?

SORRY PPL, this is not a homework question, its a high level provincial june 2005 question, i was just wondering if i got it correct, by the way i did pick option number 3 but i did waste 30 mins doing irrelevent calc to find out how to get CONSTANT speeed
5. ### Help for physics static and kinetic friction

THANKS a lot DOC AL, i LUV U lol :P
6. ### Escape Velocity constant?

another simple question: what is the energy needed to move an object away from the planets gravitational field at CONSTANT speed? 1) Ep 2)Ek 3)Change in Ep 4)Change in Ek
7. ### Help for physics static and kinetic friction

this is what i did. the friction force between sled and snow is= FN X u=(70.1+50)*0.119=14.2919 N. the friction force between the penguin and sled = (70.1)*0.671=47.0371, therefore, the max horizontal force that can be applied to the sled without causing the penguin to slide off the...
8. ### Help for physics static and kinetic friction

help for physics static and kinetic friction. Question: A 70 Newtons Penguin is on a 50 N. sled. the static friction between the penguin and sled is 0.671 and the kinetic friction between the sled and the SNOW is 0.119. FInd the maximum horizontal force that can be applied without the penguin...