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A student who weighs 500 N climbed the stairs from the firstfloor to the third floor, 15 m above, in 20 sec.
a) How much work did she do?b) What was her power?
The sound level in decibels is typically expressed as ? = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is ? = 2..
A ballerina spins initially at 1.5 revolutions/second when her arms are extended. Determine her initial moment of inertia
An electron that is moving through a uniform magnetic field has a velocity v = (30 km/s)i + 18 km/s)j when it experiences a force F = (-4.000×10-15 N)i + (6.667×10-15 N)j due to the magnetic field. If Bx = 0, calculate the magnitude of the magnetic f..
You and your friend each drive 50.0 km. You travel at 90.0 km/h. Your friend travels at 95km/h. How long will your friend be waiting for you at the end trip
The current density inside a long, solid, cylindrical wire of radius a is in the direction of the central axis and its magnitude varies with radial distance r from the axis according to J = br2, where b is a positive constant.
An ideal monatomic gas expands isothermally from 0.500 m3 to 1.25 m3 at a constant temperature of 630 K, Find the thermal energy transfer Q
A beam of photons that have a wavelength equal to 6.8pm is scattered by electrons initially at rest. What is the change in wavelength of the photons
The gravitational acceleration on the surface of Mercury is 0.38 times that of Earth. What is the ratio of the density of Mars to that of Earth
Planet Z is 1.00×104km in diameter. The free-fall acceleration on Planet Z is 10.0m/s2. What is the mass of Planet Z
A resistor is connected to a battery with negligible internal resistance. by what factor does the power dissipated in the circuit change
The plates of a 631-pF parallel plate capacitor are separated by 1.21 mm, what is the magnitude of the electric field in the capacitor
Illustrate what are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice.
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