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Question1
To measure weight of the cat, a person places a 100 N box and a 60 N box from the ends of a uniform pole that is pivoted at its center. The system balances when the cat stands at a point of the rods length from the 60 N boxes. What is the estimated mass of the cat?
Question2
Atoms can be cooled by multiple laser beams. in such an experiment, the temperature of sodium atoms can be cooled to 0.1 mK. What is rms speed of the atoms at this temperature? The atoms can be held trapped for about 1 s in a 1 cm trap. Estimate this time with the time for one of the atoms to wonder out of the trap if there was no trap action.
You stand in the earth's magnetic field, directly facing it's horizontal component ( in other words, facing magnetic south). Compute the outward flux through your body's back surface
There is evidence that elephants communicate via infrasound, Determine the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions
Sam, whose mass is 77kg , takes off across level snow on his jet-powered skis. How far has Sam traveled when he finally coasts to a stop
A heat pump uses 200 J of work to output 300 J of heat into a heat reservoir at 200 K. What is the coefficient of performance for the heat pump
An object 6.0mm high is placed 18cm from a convex mirror of radius of curvature 18cm. Determine the image distance using the mirror equation
29.0g of copper pellets are removed from a 300?Coven and immediately dropped into 110mL of water at 23.0?C in an insulated cup. What will the new water temperature be
A 45.3-cm diameter disk rotates with a constant angular acceleration of 2.20 rad/s2. It starts from rest at t = 0, Find the linear velocity and tangential acceleration of P at t = 2.30 s
A car travels at a constant speed around a circular track whose radius is 3.1 km, What is the magnitude of the centripetal acceleration of the car
You and a friend are studying late at night. There are three 150 W light bulbs and a radio with an internal resistance of 79.0, How much electrical power are you using
The electric field between the plates of a parallel plate capacitor is horizontal, uniform, and has a magnitude of 3.5*10^4 N/C. What is the angle made by the thread with the vertical axis
An electric motor rotating a workshop grinding wheel at a rate of 9.70 101 rev/min is switched off. How long does it take for the grinding wheel to stop
An average force of 201 N is exerted to draw the string back 1.3 m. unless otherwise directed, imagine that air resistance is negligible. Illustrate energy bar graphs to solve the difficulty .
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