Physics

A question about torsion pendulums.

A flat uniform circular disk has a mass of 3.10 kg and a radius of 76.0 cm. It is suspended in a horizontal plane by a vertical wire attached to its center. If the disk is rotated 1.50 rad about the w

Physics of work and pushing a refrigerator at an angle

A 2.40 x 102 N force is pulling an 85.0 kg refrigerator across a horizontal surface. The force acts at an angle of 20.0 above the surface. The coefficient of kinetic friction is 0.200, and the refrig

Three resistors 4ohms, 6ohms, and 12ohms are connected in a parallel circuit. There is a 22A current.

What is the current passing through the 4ohms resistor?-equivalent resistance =1/(1/4 + 1/6 + 1/12 ) = 2 ohms by current divider rule, current through 4 ohms resistor = (2/4) * 22 = 11 A note curre

A college dormitory room measures 12 feet wide by 16 feet long by 8 feet high. What is the weight of the air i

A college dormitory room measures 12 feet wide by 16 feet long by 8 feet high. What is the weight of the air in it under normal conditions?-mass = density times volume Density of air = 1.2kg/m^3 so

Is B always along the magnetic lines of induction

The magnetic induction vector (B) is always tangentialto any position of a magnetic line of induction. In a uniform magnetic field only, the direction of (B) is along the direction of line of inductio

What is the change in the internal energy of the engine

A model steam engine of 1.00-kg mass pulls eight cars of 1.00-kg mass each. The cars start at rest and reach a velocity of 3.00 m/s in a time of 4.00 s while moving a distance of 5.00 m. During that t

The Multiverse theory

Could there be an infinite number of Universes or could there be a finite number of Universe ? Is there proof-Multiverse is an Interpretation of quantum mechanics.We are trying to make sense out of

I need help with electric current

A 1053Welectric toaster operates on a house- hold circuit of 126 V. What is the resistance of the wire that makes up the heating element of the toaster? Answer in units of Ω.-you know P (watts) and V

What are the voltages across the aluminum part and across the copper part

A 10.0 m length of wire consists of 5.0 m of copper followed by 5.0 m of aluminum, both of diameter 1.0 mm. A voltage difference of 69 V is placed across the composite wire. The total resistance (

A spaceship moves away from Earth at a speed 0.861 c

A spaceship moves away from Earth at a speed 0.861 c and fires a shuttle craft that then moves in a forward direction at 0.312 c relative to the ship. The pilot of the shuttle launches a probe forward

A question about light and gravity

First off, just to check that Im right with these two statements. 1.Light is a wave and has no mass and no physical prescence. 2. The force of gravity is an attractive force between two physical bodie

Why is light faster then sound

Sound is ultimately propagated by the same stuff as light (i.e. electromagnetism), except sound has the mediums constituent particles involved in a delayed relay. Sound is a series of elastic collis

At 96 °F the saturation density of air is 0.04 kg/m3. If the weather report says the relative humidity is 90 %

At 96 °F the saturation density of air is 0.04 kg/m3. If the weather report says the relative humidity is 90 % when the temperature is 96 °F, the humidity is __________.-90% of 0.04= 0.36 kg/m3.

In cold countries water pipes are laid much below the ground.why

please give the explanation related to the expansion of solids! 10 points for a good answer-in colder countries the ground gets colder down in the ground as well. the water in the pipes then gets col

Find the total work done during these two processes.

A monatomic ideal gas at 27° C undergoes a constant pressure process from A to B and a constant volume process from B to C. Find the total work done during these two processes. (Let V1 = 4.70 L and an