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An insulated thermos contains112.0 cm3 of hot coffee at a temperature of 80.0 °C. You put in 11.0 g of ice cube at its melting point to cool the coffee. What is the temperature of the coffee once the ice has melted and the system is in thermal equilibrium? Treat the coffee as though it were pure water. (Answer in °C)
A pulsed proton beam is fired at a target. Each pulse lasts 45.0 ns, and there are protons in each pulse, What is the average pressure on the beam spot during a pulse
an airplane is flying at v100ms along the straight line at an altitude h5000m. at the instant when it is over an
starting from rest, a 4.1 kg block slides 2.00 m down a rough 30 degree incline. The coefficient of kinetic friction between the block and the incline is uk= 0.436, determine the work done by the normal force
A spring gun (k = 28.8 N/m) is used to shoot a 58.4-g ball horizontally. What is the speed of the ball when it hits the ground, 1.23 m below the spring gun
A 3.4-m-tall, 40-cm-diameter concrete column supports a 2.0×105kg load, By how much is the column compressed
A square, single-turn coil 0.180 m on a side is placed with its plane perpendicular to a constant magnetic field. An emf of 18.0 mV is induced in the winding when the area of the coil decreases at a rate of 0.0700 m 2/s. Compute the magnitude of the..
An electric motor rotating a workshop grinding wheel at a rate of 1.13 102 rev/min is switched off. How long does it take for the grinding wheel to stop
A heat engine takes in 1000 J of energy at 1000 K and exhausts 615 J at 200 K. What are the actual and maximum theoretical efficiencies of this heat engine
Two masses are tied to a rope. The first mass is attached to a spring that is then attached to the ground. How much potential energy is stored in the spring
A long pole is used to lift a window. If a vertical lift of 85 N is needed to raise the window, elucidate what force must be exerted along the pole? Assume the pole makes an angle of 49° with the vertical wall.
Light with a photon energy of 4.5 eV impinges on the surface of a material with work function 0.4 eV to eject electrons
What is the energy density in the electric field at the surface of a 2.00-cm-diameter sphere charged to a potential of 2000V
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