
A dentist uses a small mirror of radius 39 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 11 mm from the tooth, what is the magnification of the image?

An unstable particle with a mass equal to 3.34 1027 kg is initially at rest. The particle decays into two fragments that fly off with velocities of 0.986c and 0.866c, respectively. Find the masses of the fragments. (Hint: Conserve both massenergy and momentum.)

A block of glass has a critical angle of 45.2 . What is its index of refraction?

A conducting coil of 1800 turns is connected to a galvanometer, and the total resistance of the circuit is 50.0 . The area of each turn is 5.2*10^4 m2. This coil is moved from a region where the magnetic field is zero into a region where it is nonzero, the normal to the coil being kept...

Derive an expression for the buoyant force on a spherical balloon, submerged in water, as a function of the depth below the surface, the volume of the balloon at the surface, the pressure at the surface, and the density of the water. At what depth is the buoyant force half the surface value?...

You can determine the speed of a moving bullet by allowing the bullet to pass through two rotating paper disks mounted a distance, d, apart on the same axle, as shown in Figure 718. Find the bullet's speed for the following data. d = 82.0 cm = 880 rev/min (angular speed of the disks)...

Susan's 12.0 baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled above the floor. The tension is a constant 31.0 and the coefficient of friction is 0.170.Use work and energy to find Paul's speed after being pulled 3.30 .

What are oncogenes and how are they believed to be related to cancer?

A 10kg piece of aluminum (which has a specific heat of 900 J/Kg C) is warmed so that its temperature increases by 5.0C . How much heat was transferred into it?

A 63 kg swimmer jumps off a 9.5 m tower. (a) Find the swimmer's velocity on hitting the water. b) The swimmer comes to a stop 2.0 m below the surface. Find the net force exerted by the water. (Ignore the swimmer's weight in the water.)
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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?