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Standing on a balcony, you throw your keys to a friend standing on the ground below. 1.2 seconds after you release the keys, they have an instantaneous velocity of 16.0 m/s, directed 53° below the horizontal. What initial velocity did you give them?
a cell membrane has a resistance and a capacitance and thus a characteristic time constant. what is the time constant
A groove on a monophonic phonograph record wigges laterally such tht its amplitude and frequency more or less ocresspond to the sound that is recorded. If at a given moment the needles is moving through the groove at 0.50 m/s, what would be the wiggl..
What is braking distance for the first train
An 82 g arrow is fired from a bow whose string exerts an average force of 95N on the arrow over a distance of 77.00 cm. What is the speed of the arrow as it leaves bow.
Jane and Jon, with masses of 50 kg and 60kg, respectively,stand on a frictionless surface 10m apart, What is JOhn's acceleration
At a dock, a crane lifts a 1200 kg container 30 m, swings it out over the deck of a frieghter, How much work is done by the crane on the container
A 20.0-kg box rests on a horizontal surface. The coefficient of static and kinetic friction between the box and the surface are 0.30 and 0.10 respectively, find the friction force between the box and the surface
One end of an iron rod 40 cm long and 3.3 cm in diameter is in ice water, the other in boiling water. What is the heat-flow rate along the rod
Only two forces act on an object (mass = 2.70 kg), as in the drawing. (F = 63.0 N.) Find the magnitude and direction (relative to the x axis) of the acceleration of the object.
a baseball has a mass of about 155 g. what is the magnitude of the momentum of a baseball thrown at a speed of 98 miles
The metal equilateral triangle in the figure, 20 {rm cm} on each side, is halfway into a 0.10 {rm T} magnetic field.What is the magnetic flux through triangle.
A girl with mass m1 and a sled with mass m2 are on the frictionless ice of a frozen lake, How far from the girl's initial position do they meet
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