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Question1
A small immersion heater can be used to heat a cup of water for coffee or tea. If the heater can heat 180mL from 27 C to 94C in 12 min, approximately how much current does it draw from the car's 12-V battery? Suppose 70 percent efficiency.
Question2
A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If center of the target is level with the rifle, how high above the target have to the rifle barrel be pointed so that the bullet hits dead center?
The electric field on the axis of a uniformly charged ring has magnitude 400 at a point 6.0 from the ring center. Find the ring's charge
A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0 ? , Find the vertical component of the force
When you bend your knee, the quadriceps muscle is stretched. What size force does the femur exerts on the kneecap if the tendons are oriented as in the figure and the tension in each tendon is 60 {\rm N}
A red laser from the physics lab is marked as producing 632.8-nm light. When light from this laser falls on two closely spaced slits, What is the wavelength of light produced by the pointer
A spherical ball of material is rotating about its center at 35 rad/s. It has a mass of 2.0 kg and a radius of 0.11 m. what will be its rate of rotation
A 140 ? lamp, a 25 ? electric heater, and a 57 ? fan are connected in parallel across a 137 V line. What is the current of the lamp
A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr towards a tall building which reflects the sound waves. The frequency of the siren heard by the car driver is
at least Each pulse produced by an argon-fluoride excimer laser used in PRK and LASIK ophthalmic surgery lasts only 10.0 ns but delivers an energy of 2.05 mJ. What is the power produced during each pulse
A 10g lead bullet at 23 degrees celsius slams into a stone wall. Assuming no loss of energy to the environment, how fast must the bullet be traveling
the U.S. five-cent coin, the nickel, has a mass of 5.1 grams, a volume of 0.719 cm^3, and a total surface area of 8.54 cm^2. how much radiant energy per second comes from the nickel
The electrical field within a continuous distribution of charge is given by the equation E= cxi+cyj+czk, Write the equation for E in terms of the position vector r
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision. how far did they skid
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