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What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is1.22? Neglect the mass of the balloon fabric and the basket.
a frictionless roller coaster car of mass m tops the first hill with speed v0 at height h. How high will the car go on the last hill
Two point charges are placed on the x axis as follows: chargeq1= -1.50 nC is located at x=.200m, and a charge q2= +5.00 nC is atx=-.300m. What are the magnitude and direction of the net forceexerted bu these two charges on a negative point charge q3=..
A car dealer claims that his product would accelerate at a constant rate from rest to a speed of 200 km/hr in 8s. What approximate distance will the car travel.
A 2 kg mass is attached to a rope that that is swung in a horizontal circle with a circumference of 3 meters. What must be the tension in the rope so that the ball just misses the top of the 3 meter wall?
A spring that has a force constant of 1000 N/m is mounted vertically on the ground. By what distance does the spring compress
Point charges, Q1 = +46 nC and Q2 = -75 nC, are placed as shown. The work done by the external force is closest to
You are driving just behind a second car and both of you are moving at a speed 68. If you are very tired after a long night, or you are texting, or you are alcohol impaired, your reaction time can be twice your standard reaction time. What is the m..
An electric field is = sign(x)·(340 N/C), where sign(x) equals ?1 if x 0. A cylinder of length L = 16 cm, What is the flux through the curved surface of the cylinder
Clarice is standing at the edge of a steep cliff when a boulder comes loose from the edge and falls directly downward toward the lake below. Clarice hears the sound of the boulder hitting the water 7.5 s later. If the speed of sound is 340 m/s, how h..
An underwater diver sees the sun 50 degrees above horizontal. How high is the sun above the horizon to a fisherman in a boat above the diver?
An extreme skier, starting from rest, coasts down a mountain that makes an angle of 34.3 ° with the horizontal. How fast is she going just before she lands
three point charges have equal magnitudes two being positive and one negative. these charges are fixed to the corners
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