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The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process. Evaluate at what height above the surface of the earth does the balloon have a speed of 7.00 m/s? Enter a number.
A 0.174kg softball is pitched horizontally at 26m/s. the ball moves in the opposite direction at 38m/s after it is hit by the bat.
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.0 cm and released. If the spring constant is 85 N/m, what is the magnitude of spring force acting on the toy at the moment i..
The mass of each can be taken to be 37,000 . If the train is accelerating at on a level track, elucidate the tension in the coupling between the second and third cars? The car nearest the locomotive is counted as the first.
Charges of -11.5 nC and -22.1 nC are separated by 0.733 m. What is the potential midway between the two charges?
Avoid the weight of the bat, since it is so much less than the force of the bat. Select the direction of the incoming ball as positive direction.
How much time does the object take to reach the ground.
Establish steady-state electric field inside Nichrome wire
Horse races once around a circular track in a time of 176 s, with a speed of 26 m/s. What is the radius of the track.
Find out the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 35.0 below the horizontal.
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.40 10-4 m3 and its mass is 3.87 kg. a) What mass of gold is in the rock? b) What percentage of the rock is gold by volume? c) What percentag..
If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height.
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