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She starts up at 5.75m/s and returns at 3.75m/s , how much mechanical energy did she lose on the hill? change of (E (mech))= ? J what happened to the energy?
A 318 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 624 mmHg. Calculate the moles of Ar present.
Determine the charge within a cubical boxof side = 25 m, where the box is oriented sothat four of its sides are parallel to the field lin
Light strikes the ice perpendicularly and travels through it and then through the crystalline quartz. In the time it takes the light to travel through the two sheets, how far would it have traveled
The graph shows the potential energy of an electric dipole. Consider a dipole that oscillates between +/- 60 degrees. What is the dipole's mechanical energy?
The glass is illuminated from above with light having a wavelength in air of 660. How many interference fringes are observed per centimeter in the reflected light?
Find the tension in the wire holding up the 80 kg sign below (assume the 30kg pole is attached to the wall with a pivot)
In what direction (clockwise or counterclockwise) and with what angular speed (in rad/s) does the turntable rotate? How much work (in joules) does the woman do to set herself and the turntable in moti
A flower pot fell of a windowsill and falls past the window below. you may ignore air resistance. it takes the pot .470s to pass the window, which is 1.80m hight. how far is the top of the window be
A cube of ice is taken from the freezer at -6.3 and placed in a 106 aluminum calorimeter filled with 304 of water at room temperature of 20.0.
A 7.4 kg base runner begins his slide into second base when he is moving at a speed of 4.7 m/s. How much mechanical energy is lost due to friction acting on the runner?
A 2000kg ferris wheel accelerates from rest to an angular speed of 20.0 rad/s in 12 secs. Approximate the ferris wheel as a circular disk with a radius of 30m. what is the net torque on the wheel?
If they were connected by a very light (and very long!) string, what would be the tension in the string? Express your answer in newtons and in pounds.
The volume of 4.0 cubic meters of gas is kept under constant pressure. Its temperature is increased from a minus 73 degrees Celsius to 127 degrees Celsius. What is the new volume of the gas?
What is the breaking stress of nichrome wire with 32 SWG?
A submarine is 300 m horizontally out from the shore and 96 m beneath the surface of the water. A laser beam is sent from the sub so that it strikes the surface of the water at a point 210 m from t
If the coefficient of kinetic friction between the box and the roof is 0.53, with what speed should you push the box to have it gently come to rest right at the edge of the roof?
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. What is the maximum acceleration of the needle?
While in the first excited state, the electrons recieves 1.888eV of energy. What is the quantum number n that describes the engergy level that the electron ends up at?
A communications satellite is in an orbit that is 3.10 107 m directly above the equator. Consider the moment when the satellite is located midway between Quito, Equador, and Belem, Brazil; two citi
Calculate the torque around the center of the clock due to the weight of these hands at 1:35. The weight of each hand acts at the center of mass?
Find the separation between the two sources. The velocity of sound is 340 m/s. Answer in units of m.
Then its engine fails, and the rocket proceeds to move in free-fall. Find (a) the maximum altitude reached by the rocket, (b) its total flight time, and (c) its horizontal range.
A 543- physics student stands on a bathroom scale in an 824- (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 462 . Find the magnitude o
Motor M draws in the cable with an acceleration of 4 ft/s^2, measured relative to the 200 lb mine car. Determine the acceleration of the car and the tension in the cable. Neglect the mass of the pu