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You are helping your friend prepare for her next skate board exhibition. For her program, she plans to take a running start and then jump onto her heavy-duty 15-lb stationary skateboard. She and the skateboard will glide in a straight line along a short, level section of track, then up a sloped concrete wall. She wants to reach a height of at least 10 feet above where she started before she turns to comeback down the slope. She has measured her maximum running speed to safely jump on the skateboard at 7 feet/second. She knows you have taken physics, so she wants you to determine if she can carry out her programs as planned. She tells you that she weight 100 lbs and that her skateboard wheels are practically frictionless.
During a snowball fight, two snowballs travelling towards each other collide head-on. The first is moving east at a speed of 15.3 m/s and has a mass of 0.450 kg, What is the mass of the second snowball
An Olympic skier whose mass is 50 kg is moving at 25 m/s down a 20degree slope encounters a region of wet snow of coefficient of frictio Uk=0.55 which reduces her speed. Find the acceleration of the skier
A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.2 cm. Use work and energy considerations to find the average frictional force that stops the bullet
In the ground state of hydrogen, theuncertainty in the position of the electron is roughly 0.10nm. how fast is the electron moving
A small object of mass 3.58 g and charge -17.4 µC is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground
A black wood stove with surface area 4.6 \rm{ m^2} is made from cast iron 4.0 \rm mm thick. The interior wall of the stove is at 650 \rm { ^\circ C}, find how much heat the stove loses by a combination of conduction and convection in the surroundin..
refrigerant r 134 at 5 bars and 4degc enters a mixing chamber at a steady rate of 2 kgs. another source of refrigerant
When a 42.0-V emf device is placed across two resistors in series, a current of 12.0 A is flowing in each of the resistors. When the same emf device is placed across the same two resistors in parallel, the current through the emf device is 62.0 A. Wh..
A system with a volume of 100L is initially empty, and then it is filled completely with water. What fraction of water exists as a liquid when 100kg are put into the system
the total charge a household battery can supply is given in units of mahr. for example a 11v alkaline battery is rated
A swimming pool 2.6 m by 1.0 m has a uniform depth of 2.0 m, What is the absolute pressure at the bottom of the pool
The Position of the object (wire gauze) on the meter stick is at the 5.00 cm mark. What is his value for the focal length of the lens
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