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A hospital patient has been given 131I (half-life = 8.04 days) which decays at 4.4 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptab
A steel ball is dropped from a building's roof and passes a window, taking 0.128 s to fall from the top to the bottom of the window, a distance of 1.22 m.
A transverse wave is traveling on a string. The displacement y of a particle from its equilibrium position is given by y= (0.021m) sin (25t-2.0x).
What are the magnitude and direction of the ball's velocity when it strikes the wall? Has the ball reached the highest point of its trajectory at this time? Explain.
A train moving with constant velocity travels 170 m north in 12 s and an undetermined distance to the west. The speed of the train is 32 m/s. (a) find the direction of the train's motion relative to
Then use Archimedes' principle to find the density required for the air inside the balloon. Then find the temperature of the air inside the balloon.
A cork shoots out of a champagne bottle at an angle of 35 degrees above the horizontal. if the cork travels a horizontal distance of 1.3 m in 1.25 s, what was its initial speed?
A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 8.0 cm. If a timer is started when its displacement is a maximum (hence x = 8 cm when t = 0), what
Standard physics textbooks generally deal with an idealized parallel-plate capacitor, where the size of the plates is much larger than the separation between the plates, something that is not true i
What exit speed could a skier reach in the absence of air resistance and what percentage of this ideal speed is lost to air resistance?
You tell her to buy a copper plate and bolt it to the ceiling in her room and then use your electron extractor to transfer electrons from the plate to the cat.
The water beneath a surface rectangle 2.50 nautical miles by 2.90 nautical miles has a depth of 17.0 fathoms. Find the volume of water (in cubic meters) beneath this rectangle.
Suppose that you want to take a photograph of yourself as you look at your image in a mirror 3.8 m away. For what distance should the camera lens be focused?
If the cat weighs 6.67 kg and is suspended 1.73 m below the ceiling, how many electrons have to be extracted from the cat? Assume that the cat and the metal plate are point charges.
At the end of the firing period, the craft has velocity components of vx = 3762 m/s and vy = 4847 m/s. Calculate the magnitude of the initial velocity.
A severe thunderstorm dumped 2.5 in of rain in 30 min on a town of area 34 km^2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 10^3 kg.
An axon is the relatively long tail-like part of a neuron, or nerve cell. The outer surface of the axon membrane (dielectric constant = 5, thickness =1.00 x 10-8 m) is charged positively, and the i
Two 5 gram spheres are each suspended from a pin by a 40 cm long non-conducting thread. If the spheres are separated by 7 cm because of electrostatic repulsion, find the charge on each, knowing the
A magician's trick involves charging a 50 kg box with 2 x 10-3 C of charge, then charging a platform with the same charge. When the box is released, it "floats" how far above the platform?
A transparent oil of index of refraction 1.29 spills on the surface of water (index of refraction 1.33), producing a maximum of reflection with normally incident orange light (wavelength 600nm in ai
Of the initial charges on the spheres, with a positive net charge, what was (a) the negative charge in coulombs on one of them and (b) the positive charge in coulombs on the other?
The center of mass of the ladder is 2.5 m from its base, and the coefficient of static friction between the ladder and the floor is 0.2. How far up the ladder, measured along the ladder, can a 600N
A) If a toaster is plugged into a source of alternating voltage with an rms value of 163 V, an rms current of 8.29 A occurs in the heating. What is the resistance of the toaster's heating element?
If you slowly pull the string down through the hole, what quantity is conserved during this motion? What is the block's speed when it is a distance r from the hole?
The system is released from rest. If there is no sipping between any of the surfaces, what is the acceleration of the board. Solve using force and torque.