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A tennis player hits a ball 1.8m above the ground. The ball leaves her racquet with a speed of 20.0m/s at an angle of 5? above the horizontal. The horizontal distance to the net is 7.0m, and the net is 1.0m high. (a) Does the ball clear the net? If so by how much? If not, by how much it miss? (b) What was the ball's speed when it clears the net? (c) Is the ball on its way up or on its way down?
A planet of mass m = 7.05 × 1024 kg is orbiting in a circular path a star of mass M = 4.95 × 1029 kg. The radius of the orbit is R = 8.35 × 107 km
the electric potential at a position located a distance of 18.9 mm from a positive point charge of 8.70times10-9 c and
two point charges of equal magnitude are 7.8 cm apart. at the midpoint of the line connecting them their combined
A potter's wheel having a radius 0.49 m and a moment of inertia 10.9 kg·m2 is rotating freely at 52 rev/min. Find the effective coefficient of kinetic friction between the wheel and the wet rag
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.555m from the axis of rotation of the stool. Compute the kinetic energy of the system before the dumbbells are pulled in
At t=0 a wheel rotating regarding a fixed axis at a constant angular acceleration has an angular velocity of 2.0 rad/s. Two seconds later it has turned through 5.0 complete revolutions. What is the angular acceleration of the wheel?
A rope with 270g of mass per meter is under 600N tension. A wave with frequency 4.0Hz and amplitude 6.1cm is propagating on the rope. What is the average power carried by the wave?
a parallel plate capacitor is made of two 10cm x 10cm plates spaced 1 cm apart. they are charged with a -1nc. an
A glass window pane in a home is 0.62 cm thick and has dimensions of1.2 m 2.2 m. obtain how much energy is lost during the window in one day, assuming the temperatures outside and inside remain constant
A spherical balloon of volume 3.94 103 cm3 contains helium at a pressure of 1.15 105 Pa. How many moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 10-22 J?
Suppose that a 1.00 cm3 box in the shape of a cube is perfectly evacuated, except for a single particle of mass 1.23 x 10^-3 g. Find the temperature inside the box
A photon with a wavelength 4.40 scatters from an electron initially at rest. Find out the wavelength of the scattered photon when the scattered electron has its utmost kinetic energy. Kmax = 2.37*20^-14.
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