
A patient undergoing radiation therapy for cancer receives a 215rad dose of radiation. (a) Assuming that the cancerous growth has a mass of 0.17 kg, calculate how much energy it absorbs. (b) Assuming the growth to have the specific heat of water, determine its increase in temperature.

the Speed that all the planets rotate?

The green block is falling at a speed of m/s and is meters above the spring. The spring constant is 4000 N/m, to the nearest tenth of a cm how far is the spring compressed

A track consists of a frictionless arc XY, which is a quartercircle of radius R, and a rough horizontal section YZ. Block A of mass M is released from rest at point X, slides down the curved section of the track, and collides instantaneously and inelastically with identical block B at point Y....

What width slit will produce a central maximum that is 2.50 wide on a screen 1.50 from the slit?

(a) How fast is an object moving on land if it is moving at Mach 0.17? m/s (b) A highflying Concorde passenger jet displays its Mach number on a screen while cruising at 3000 km/h to be 1.9 . What is the speed of sound at that altitude? m/s

A small, 100 cart is moving at 1.80 on an air track when it collides with a larger, 4.00 cart at rest. After the collision, the small cart recoils at 0.840 . Steven Modica Part A  What is the speed of the large cart after the collision? =

Two wave pulses on a string approach one another at the time t = 0, as shown in the Figure, Each pulse moves with a speed of 1.0 m/s. Make a careful sketch of the wave pulses at the times t=1.0 s, 2.0 s, 2.5 s, 3.0 s, and 4.0 s, assuming that the superposition principle holds for these waves, and...

A dentist uses a small mirror with a radius of 38 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 16 mm from the tooth, what is the magnification of the image?

A m2 = 4.72 kg mass is connected by a light cord to a m1 = 2.71 kg mass on a smooth surface. The pulley rotates about a frictionless axle and has a moment of inertia of 0.517 kg*m2 and a radius of 0.252 m. Assuming that the cord does not slip on the pulley, find the acceleration of m1.
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Sample Questions
 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
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