05/03/19

magnets and force
The Electrons in a beam are moving at 2.5×108 m/s in an electric field of 19000 N/C. What value must the magnetic field have if the electrons pass through the crossed fields undeflected? Answer in... more
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05/01/19

A concave spherical mirror can be used to project an image onto a sheet of paper, allowing the magnified image of an illuminated real object to be accurately traced.
A concave spherical mirror can be used to project an image onto a sheet of paper, allowing the magnified image of an illuminated real object to be accurately traced. If you have a concave mirror... more
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05/01/19

The frequency of light coming out from a laser source is 318 MHz. What is the wavelength corresponding to the light in meter provided that the speed of light inside the medium is 2.7 x10^8 m/s?
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04/28/19

The acceleration due to gravity on the surface of Mars is 3.7 m/s^2. What is the acceleration due to gravity at a distance of 1 mars radius above the surface of Mars?
The acceleration due to gravity on the surface of Mars is 3.7 m/s^2. What is the acceleration due to gravity at a distance of 1 mars radius above the surface of Mars?What equation should I use for... more
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04/28/19

An ideal gas is enclosed in a piston, and 1600 J of work is done on the gas. As this happens, the internal energy of the gas increases by only 900 J.

An ideal gas is enclosed in a piston, and 1600 J of work is done on the gas. As this happens, the internal energy of the gas increases by only 900 J. During this process, how much heat flows... more
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04/26/19

What is the magnitude of the electric field produced by a charge of magnitude 5.00x10-6 C at a distance of 2.00 m?
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04/17/19

A plane heads East at 450 mph then goes North at 225 mph. What isthe resultant speed and direction? (Round to the nearest tenth)
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03/23/19

applications of quadratics
A coin, thrown upward at time 𝑡=0 t = 0 from an office in the Empire State Building, has height in feet above the ground 𝑡 t seconds later given by h(t)=-16t^2+64t+960=-16(t-10)(t+6) From what... more
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03/21/19

Physics rollercoaster question
A rollercoaster is making a loop. At the top you are weightless and the coaster is moving at 20 m/s. What is the radius of the loop?
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03/20/19

Physics question
How fast would an airplane have to go to make a loop of 220 meters radius to keep from fallout out of the loop or taking negative G’s?
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03/19/19

In a vacuum, why doesn’t an elephant accelerate faster than a penny as it falls to the ground?
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03/15/19

Why doesn't a spinning object in the air fall?
Let's say I have a ball attached to a string and I'm spinning it above my head. If it's going fast enough, it doesn't fall. I know there's centripetal acceleration that's causing the ball to stay... more
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03/15/19

Which of the following situations would cause the greatest decrease in the motion of molecules in a system?
A. Q = -50 J, W = -50 J B. Q = +50 J, W = +50 J C. Q = -50 J, W = +50 J D. Q = +50 J, W = -50 J
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03/14/19

eight more than three times a number is 47 what is the number
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03/14/19

According to my Physics teacher, the amplitude does change when the frequency rises.
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03/14/19

Is there any friction between wheel and road?
Human beings invented the wheel to get rid of the friction between the wheel and the road. But were we able to reduce it to zero? Is there any residual friction? This question is about only the... more
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03/14/19

Why doesn't the Earth accelerate towards us?
According to Newton's third law of motion that states that every action has an equal and opposite reaction. So, if the Earth exerts a gravitational pull on us (people) then even we should exert a... more
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03/07/19

A girl, starting from rest, travels a distance of 50m in 10s. Caculate her velocity at the end of 10s
A girl, starting from rest, travels a distance of 50m in 10s. Caculate her velocity at the end of 10s
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02/28/19

A force of 200.0 N acts on a 7.20-kg bowling ball for 0.350 s.

Calculate its change in velocity: _
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02/28/19

A student strikes a 0.055-kg golfball with a force of 260 N. If the ball moves with a velocity of 65 m/s, calculate the time the ball is in contact with the club.

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02/08/19

Torque Problem (Door)
Question: Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the... more
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04/30/18

Find speed of the boat in still water
A boat travels 50 miles downstream in the same time that it takes to go 30 miles upstream. The speed of the stream is 3 miles per hour. Use algebra to find the speed of the boat in still water.
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08/02/17

a string has a mass of 3g and length of 60cm what must be the tension so that the vibration transversly overtone a (f) of 200hz
pppppppppppppppppppppppppppppppp
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