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Consider the group of three +2.8 nC point charges shown in the figure. What is the electric potential energy of this system of charges relative to infinity? (k = 1/4A?€A?µ 0= 8.99 Af- 109 N A?· m2/C2).
An experiment finds that standing waves on a 0.800-m-long string, fixed at both ends, occur at 24.0 Hz and 32.0 HZ, but at no frequencies in between. What is the wave speed on the string
A uniform meter stick has a 45.0 g mass placed at the 20 cm mark. If a pivot is placed at the 42.5 cm mark and the meter stick remains horizontal in static equilibrium, what is the mass of the meter stick?
At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, By what percentage does the intensity increase
q1. a planet of mass 6.00 1025 kg is in a circular orbit of radius 2.00 1011 m around a star. the star exerts a force
In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground, what is the launch speed needed to hit the bulls-eye
A mass of 50 kg is suspended from a steel wire of diameter 1.0 mmand length 11.2 m. How much will the wire stretch
A 63-kg skier is going down a slope oriented 31° above the horizontal. Determine the pressure that each ski exerts on the snow
Neutron stars consist only of neutrons and have unbelievably high densities. If a dime (V = 2.0 x 10-7 m3) were made from this material, determine how much would it weight (in pounds)
A particle moving along the x-axis with constant speed has adisplacement of 14 m at t = 1.00 s and a displacement of 42 m at 8.00 s. Plot the displacement versus time graph and determine the particles speed.
At a coal burning power plant a steam turbine is operated with a power output of 475 MW. Find at what rate is heat discarded to the environment by this power plant
What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to 14 before coming to rest momentarily? answer in m/s.
A small object begins a free-fall from a height of H = 82.5 m at t0 = 0 s. After ? = 2.85 s, a second small object is launched vertically up from the ground with the initial velocity v0 = 40.2 m/s. At what height from the ground will the two objec..
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