04/08/16

Physics question on Coulomb
Hi, I need help with the following :    If you are wearing rubber sole shoes and a cat rubs himself on you, who would exchange a charge? Which of you is positivly charged and which of you is... more
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04/03/16

How can a velocity time – curve be interpreted to determine displacement
another question:   How can a velocity – time graph be interpreted to determine acceleration, what is this process called?
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03/13/16

Physics Problems (2) : Work & Power
How much power is expended to raise a 300 kg roller coaster car to the top of a 35 m hill in 10 seconds? How much potential energy does the roller coaster car have at the top of the... more
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03/11/16

Physics Question, please help?
A 17 kg block sits on a plane inclined at 47 degrees. On one side of the block, astring is attached and goes up the inclined plane and over a pulley, after which it attaches to adangling mass. On... more
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03/06/16

A 4530-kg helicopter accelerates upward at 2.1 m/s2. What lift force is exerted by the air on the propellers?
how would you solve this
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02/15/16

i need help doing scientific notation?
(7.8×10^4)(5×10^-6)   I mean i get how to do some of the problem. i know i have to multiply 7.8 and 5 and i get 39 but idk what to do with exponents. could someone help please. do i subtract 4... more
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01/27/16

With what speed would a person need to leave the ground?
Excellent human jumpers can leap straight up to a height of 1.1 m off the ground. To reach this height, with what speed would a person need to leave the ground? Assume no air resistance (free-fall... more
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01/17/16

Centrifugal force is fictitious force.Why is it called fictitious force ?
Centrifugal force is fictitious force.Why is it called fictitious force ? Explain with a example.
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01/14/16

Physics Homework
Two very small spheres are initially neutral and separated by a distance of 0.50m. Suppose that 3.0xe13 electrons are removed from one sphere and put on the other. (A) what is the magnitude of the... more
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01/13/16

PHYSICS HELP PLEASE!
A large electroscope is made with "leaves" that are 78-cm-long wires with tiny 47 g spheres at the ends. When charged, nearly all the charge resides on the spheres.   If the wires each make a 26°... more
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01/12/16

The electrostatic force between two charges are located 2 meters apart of 15 N. What will be the force between these charges when they are located 1 meter apart
please help!
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01/12/16

Reverse matter splitting (I don't know the term)
If I tear up a piece of paper in two, and than want to put it back as it was (reverse the process) why is it not possible and how is the reversal process called?
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01/09/16

ASystemConsistsOf55Electrons&43Protons.WhatIsTheTotalChargeOfTheSystem?
physics question
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01/06/16

A ball thrown horizontally at 22.1 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?
how would you do this?
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01/06/16

A ball is thrown horizontally from the roof of a building 54 m tall and lands 35 m from the base. What was the ball's initial speed?
how would you do this?
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12/20/15

how many grams of sugar would you need to have the same number of particles as 5.0 grams of salt?
I'm having a hard time with my chemistry lab, please help!
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12/13/15

If you exert 200 N of force to move a box 8 meters across the living room in 2 seconds, what is your power?

A. 800 W B. 1600 W C. 80,000 W D. 400 W
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12/13/15

You expend 1000 W of power in moving a piano 10 meters in 5 seconds. How much force do you exert?

A. 50,000 N B. 50 N C. 500 N D. 250 N
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12/13/15

A 13-g sample of calcium reacts with bromine to form 24-g of calcium bromide. How grams of bromide are used in the reaction
I need help solving this problem becuase I have no idea what I am doing, please help 
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12/11/15

What is the specific heat of lead if it takes 97.8 J to raise the temperature of a 75.0 g block by 9.70 °C?
What is the specific heat of lead if it takes 97.8 J to raise the temperature of a 75.0 g block by 9.70 °C?   I have tried using Q=mcdeltaT and the answer is wrong. I got .13 J/g*C
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12/09/15

Length and width
The length of a rectangle is 1 ft more than double the width, and the area of the rectangle is 28 ft2. Find the dimensions of the rectangle.
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12/08/15

How can you use the shape of th eorbital path to find the distance traveled
The Earth is on average 93 million miles from the sun. It makes one revolution every 365 days.
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12/08/15

why does it take extra energy to turn a liquid to gas
Why does it take extra energy to turn a liquid into a gas?
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12/07/15

How does the pressure on each dummy compare?
Two safety dummies (of equal mass) are being used to test seat belts. Dummy A has a wide seat belt, and Dummy B has a narrow seat belt. Both dummies are crashed into a barrier while in the same... more
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12/06/15

You are pulling a wagon up a ramp at a constant velocity Please calculate the kinetic coefficient of friction between the wagon and the ramp?
Ramp is at a 23 degree angle from the ground. The mass of the wagon is 20 kg. Fp=152N and the Fp is at an angle of 48 degrees.
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