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In physics we were told that gravity pulls up down and that a chair for instance pulls up and that the forces balance each other out buy how can a chair have a force i find this a little confusing. Can any1 help?
An engineer wishes to determine the specific heat of a new metal alloy. A 0.150-kg sample of the alloy is heated to 540°C. Calculate the specific heat of the alloy
A current I = 15 amp is directed along the positive x-axis in a wire, which lies perpendicular to a uniform magnetic field. The current carrying wire experiences a force per unit length of 63 N/m in the negative y direction. Decide the magnitude and ..
A solid aluminum sphere has a radius of 2.34 m and atemperature of 89.0 °C. The sphere is then completely immersedin a pool of water whose temperature is 22.3 °C. find the magnitude of the difference between the weights
The measurement of the energy of a photon requires a timeinterval of 3.6 x 10-8 sec. What is the smallest uncertainty in the photon's energy
A 78 g basketball is launched at an angle of 57.6? and a distance of 19.2 m from the basketball goal. What speed must the player give the ball
The membrane that surrounds a certain type of living cell has a surface area of 5.00 10-9 m2 and a thickness of 1 10-8 m. how much charge resides on the outer surface
A positive charge of 0.800 µC is located in a uniform field of 1.15 × 105 N/C. How close are the two charges
The new comet Alex-Casey has a very elliptical orbit with a period of 127.4y. what is the greatest distance from the sun
a dart is thrown horizontally with an initial speed of 17 ms toward point p the bulls-eye on a dart board. it hits at
A wire of diameter 0.750 mm and length 20.0 m has a measured resistance of 2.60 ohm. What is the resistivity of the wire
Calculate the electric flux through the cube - calculate the scalar potential at the origin.
A listener increases his distance from a sound source by a factor of 5.56. what is the change in the sound intensity level in dB
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