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If the universe is approximated as an ideal blackbody, calculate the temperature of this residual radiation.
Your microwave oven draws 1100 of electrical power when it is running. If it takes 45 for this microwave oven to raise the temperature of the coffee to 60 , what is the efficiency of heating with th
A glass tube of radius 0.80cm contains liquid mercury to a depth of 64.0cm at 12 deg. Find the depth of the mercury column at 100 deg. Assume that the linear expansion coefficient of the glass is 10
An automobile tire is rated to last for 30,000 miles. Estimate the number of revolutions the tire will make in its lifetime.
Find the final temperature. The specific heat of copper is 387 J/kg degrees C and the specific heat of ice is 2090 J/kg degrees C. The latent heat of fusion of water is 3.33x10^5 J/kg and its specific
How many jumps must he make? Assume that the efficiency of the body in using energy is 25%
A flat surface having an area of 3.6 m2 is rotated in a uniform electric field of magnitude E = 5.6 x 105 N/C. Determine the electric flux through this area in the following situations:
An inventor approaches you with a device that he claims will take 90 J of thermal energy input and produce 260 J of electricity.
A bicycle tire of radius 0.33 m and mass 1.5 kg is rotating at 98.7 rad/s. What torque is necessary to stop the tire in 2.0 s? Please show all work and equations used.
A container of gas is at a pressure of 1.3 x 105 Pa and a volume of 6.0 m3. How much work is done by the gas if it expands at constant pressure to twice its initial volume?
Defining the potential energy to be zero when the dipole is transverse to the electric field, find the potential energy of the dipole in the electric field for the orientations specified in Parts (a
The magnetic flux through 20 turn coil with a 100 O resistance changes at a constant rate from -5.8 Tm2 to 3.8 Tm2 in 0.48 s. What is the induced current in the coil?
An ideal gas is at 30 degrees C. The gas is cooled, reducing the thermal energy by 20%. What is the new temperature in degrees C ?
Two points charges attract each other with an electric force of magnitud F. If one charge is reduced to one third its original value and the distance between the charges is doubled, what is the resu
A bucket filled with water has a mass if 54 kg and is hanging from a rope that is wound around a 0.050 m radius stationary cylinder. If the cylinder does not rotate and the bucket hangs straight dow
The superball is now replaced with a clay ball that has the same mass and is dropped from the same height. What would be the average force exerted on the clay ball?
What was the initial negative charge on one of the spheres, and what was the initial positive charge on the other? (Hint: Use charge conservation and solve for one of the initial charges. You will e
A 6cm diameter horizontal pipe gradually narrows to 4cm. Whenwater flows throught this pipe at a certain rate, the guagepressure in these two sections is 32.0kPa and 24kPa respectively. What is the
In a 5.00 km race one runner runs at a steady 12.0km/h and another runs at 14.5 km/h. How long does the faster runner have to wait at the finish line to see the slower runner cross?
A woman walks 250m in the direction 300 east of north, then 175m directly east. Find (a) the magnitude and (b) the angle of her displacement from the starting point. (c) Find the distance she walks.
A pump is required to lift a mass of 820kg of water per minute from a well of depth 14.7 m and eject it with a speed of 17.3m/s . a-How much work is done per minute in lifting the water
The coefficient of kinetic friction between the ramp and the incline is 0.254. The suitcase travels a distance 4.20m along the ramp. a-Calculate the work done on the suitcase by the force
Find the components of the velocity and the speed of the ball when it reaches the wall:
If the coefficient of static friction between the glider and the track is = 0.65, what is the maximum initial speed that the glider can be given and still remain at rest after it stops instantaneous
A factory worker pushes a 30.2kg crate a distance of 4.5m along a level floor at constant velocity by pushing downward at an angle of 29 below the horizontal. The coefficient of kinetic friction be