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The bright springtime star Regulas has its wavelength of maximum energy intensity located at 250 x 10^-9 meters. What is the temperature of Regulas? What is the approximate spectral type of Regulus?
A 40.0 kg wagon is towed up a hill inclined at 18.5o with respect to the horizontal. What is the acceleration of the wagon
A cosmic ray proton strikes the earth near the equator by a vertical velocity of 2.8*10^7 m/s. suppose that the horizontal component of the earth's magnetic field at the equator is 30 uT. Compute the ratio of the magnetic force on the proton to the g..
An %u03B1-particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of1.20 106 V, What is the radius of its circular path
An ideal gas occupies a volume of 3.0 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container
When resting, a person has a metabolic rate of about 5.84 x 105 joules per hour. The person is submerged neck-deep into a tub containing 3.61 x 103 kg of water at 28.8 °C. If the heat from the person goes only into the water, find the water temper..
charge is uniformly distributed around a ring of radius r and the resulting electric field is measured along the rings
A proton is initially at rest. After some time, a uniform electric field is turned on and the proton accelerates. The magnitude of the electric field is 1.22*105 N/C. What is the speed of the proton after it has traveled 3.00 cm?
Suppose that the central diffraction envelope of a double-slitdiffraction pattern contains 21 bright fringes and the first diffraction minima eliminate (are coincidentwith) bright fringes. How many bright fringes lie between the firstand second minim..
A large aquarium of height 4.19 m is filled with fresh water to adepth of D = 1.60 m. By how much does the total force on that wall increase if the aquarium isnext filled to a depth of D = 4.20 m
A laser beam enters a 1.00 cm thick glass block at an angle of 51° from the normal. The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel during the glass?
A wind turbine is initially spinning at constant angular speed. Evaluate how much time elapses while the turbine is speeding up
A 70·kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 37.0° above the horizontal. What is the total work done on the box by all forces
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