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At what angle does the light reaching the edge of the pool leave the water? What is the difference between the real depth and the apparent depth of the light source?
How close (measured horizontally) can the shark approach before the seagull can see it clearly? Assume the refractive index of the water is 1.335.
An object from a position 3 m above the ground to a position 8 m above the ground. What is the change in the gravitational potential energy of the object?
A cardinal (Richmondena cardinalis) of mass 4.20×10-2 kg and a baseball of mass 0.150 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude p_c of momentum to the mag
A dentist's chair with a patient in it weighs 2280 N. The output plunger of a hydraulic system begins to lift the chair when the dentist's foot applies a force of 50 N to the input piston. Neglect
Estimate the force on a 145-gram baseball if it hits the bat at 50 miles per hour and stays in contact with the bat for 0.1 second, during which time it reverses direction.
A length of copper wire carries a current of 10 A, uniformly distributed through its cross section. The wire diameter is 2.5 mm, and its resistance per unit length is 2.5 /km. Calculate the energy d
Among the most energetic cosmic rays ever detected are protons with energies of about 10^20 eV. Find the momentum of such a proton and compare with that of a 25-mg insect crawling at 2mm/s
A 8.00 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.510 T pointing up. During the course of 0.180 s, the field is changed to one of 0.250
What is the frequency of the small axial oscillations that the electron will undergo if it is released along the z-axis near the origin?
Antartica is roughly semicircular with a radius of 2000km. The average thickness of its ice cover is 3000m. How many cubic centimeters of ice does Antartica contain?
A 238U nucleus transforms to 234Th and an ejected 4He. (These are nuclei, not atoms, and thus electrons are not involved.) Suppose the separation between 234Th and 4He is 9.4 10-15 m. (a) What is th
Determine the velocity of A when t=t1. the co-efficient of kinetic friction between the horizontal plane nd block A is uk (ie mu constant)
A nonconducting solid sphere of radius 2.80 cm carries a uniformly distributed positive charge of 8.70×10-9 C. Calculate the magnitude of the electric field at a point 1.60 cm away from the c
A certain planet for an empty space vehicle is 1.12x10^4m/s. what is the coressponding escape speed for the fully loaded vehicle, which has triple the mass of the empty one?
A penny is placed at the outer edge of a disk (radius = 0.150 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.80 s. Find the mini
Coherent light with wavelength 601 nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 {rm m} from the slits. The first-order bright fri
At one point in its orbits it is 250x10^6km from the star and is moving at 35km/s. calculate the semimajor axis of the planet's orbit.
The notes produced by a violin range in frequency from approximately 196 Hz to 2637 Hz. Find the maximum wavelength in air produced by this instrument when the speed of sound in air is 331 m/s.
An electron moving in a uniform magnetic field experiences the maximum magnetic force when the angle between the direction of the electrons motion and the direction of the magnetic field is _______
A 1000-kg car is moving along a straight road down a 30^circ slope at a constant speed of 20.0 m/s. What is the net force acting on the car?
A radar antenna is tracking a satellite orbiting the earth.At a certain time,the radar screen shows the satellite to be 162 km away.The radar antenna is pointing upward at an angle of 62.3 degrees
Calculate the pressure amplitude (in N/m2) of a 500 Hz sound wave in helium if the displacement amplitude is equal to 5 x 10^-8 m. (rho = 0.179 kg/m3, v = 972 m/s.)
An x-ray beam with wavelength 0.280 nm is directed at a crystal. As the angle of incidence increases, you observe the first strong interference maximum at an angle 28.0^circ. What is the spacing d
If a sound wave that is traveling in air approaches a flat water surface with an angle of incidence of 11.7°, what is the angle of refraction?