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Two particles with electric charges Q and ?3Q are separated by a distance of 0.8 m. (a) If Q = 2.2 C, what is the electric force between the two particles? magnitude N direction (b) If Q = -2.2 C, how does the answer change? There is no change. The direction of the force is reversed. The force is three times as large.
The impact of the head of a golf club on a golf ball can be approximately regarded as an elastic collison. what must the speed of the club be before impact
Suppose a lake has a layer of ice 11 cm thick on its surface. The top of the ice layer is cooled by the atmosphere to -5.25° C. At what rate is heat transferred through a 1.5 cm2 area of the ice
Spaceman Spiff sits just outside the Milky Way galaxy with a cup of liquid Helium which is at approximately 4K (-269 degrees C). what is the latent heat of vaporization of liquid Helium
A crate of mass 11.5 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, What is the change in kinetic energy of the crate
After hitting a long fly ball that goes over the right fielder's head and lands in the outfield, how much work was done on the player by friction
An electric potential is given by V = 4x^2 + 2y^2 + x + z + 2 volts. What is the electric field at the point (2,2,2)
A massless, rigid board is placed across two bathroom scales that are separated by a distance of 2.06 m. Locate the center of gravity of the person relative to the scale beneath his head
A charge of 1 uC accelerates through a potential difference of 200V. What is the change in the electric potential of the charge
A 2.65 kg mass oscillates back and forth on a spring with a velocity vector that varies as a function of time according to the following v(t)=(3.95cm/s) sin [0.79 rad/s], What is the maximum speed of mass
A20 kg wagon is pulled along the level ground by a rope inclined at30 degrees above the horizontal. A friction force of 30 N opposesthe motion. How large is the pulling force if the wagon is moving with (a) constant speed, and (b) an acceleration of ..
A parallel-plate capacitor has the volume between its plates filled with plastic with dielectric constant K. Use Gauss's law to calculate the magnitude of the electric field in the dielectric
q1. a street lamp weight 164n. it is supported equally by two wires that form an angle of 129 degrees with each other.
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