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1. A person standing on the floor is leaning against a wall. The wall exerts on the person a force of 100 N in the horizontal direction. What other horizontal force keeps the person in equilibrium?
2. Torque is measured in Newton meters. Work can also be measured in Newton meters. What are the quantities measured in meters in the two cases?
3. What is the advantage of having gears in a bicycle?
4. A person is doing strength training of knee extensor muscles. He sits on a bench, with a weight attached to his ankle. In what position of the leg will the gravitational torque about the knee joint be maximum?
A thin spherical shell of silver has an inner radius of 2.84 x 10 -2 m when the temperature is 24.8 °C. The shell is heated to 138 °C. Discover the change in the interior volume of the shell.
A rigid container of nitrogen gas (N2) at 23° C contains 435 L at a pressure of 3.5 atm. If 26.6 kJ of heat are additional to the container, what will be the new temperature of the gas?
a roller-coaster car has a mass of 1170 kg when fully loaded with passengers. as the car passes over the top of a
What is conical pendulum? obtain and expression for its period?
A hard-thrown tennis ball is moving horizontally when it bangs into a vertical concrete wall at perpendicular incidence. What are the directions of its velocity and acceleration just before hitting the wall
A 12.69 g ice cube at -6.33 oC is place in an aluminum cup whose initial temperature is 135.39 oC. What is the mass in grams of the cup
A car sounding its horn (rated by the manufacturer at 600 Hz) is moving at 20 m/s toward the east. What frequency will he hear the assuming that the speed of sound is 343 m/s
A Heavy rainstorm dumps 1.0 cm of rain on a city five km wide and 8 km long in a two hr period. How many metric tons (1metric ton = 10^3 kg) of water fell on the city? [1cm^3 of water has a mass of 1 gram=10^-3.] How many gallons of water was this?
A spring oscillator is designed with a mass of 0.144 kg. It operates while immersed in a damping fluid, selected so that the oscillation amplitude will decrease to 1.00% of its initial value in 6.90 s. Find the required damping constant for the syste..
A “75 Watt” light bulb uses an average power of 75W when connected to an rms voltage of 120V. What is the resistance of the light bulb? What is the maximum current in the light bulb? What is the maximum power used by the bulb at any given instant of ..
A charge of 3.0 uC(micro C) and a second charge are initially far apart. find the magnitude of the unknown charge
A uniform meter stick of mass M has ahalf-filled can of fruit juice of mass m attached to oneend. Calculate the mass of the can of juice
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