Physics problem

1.Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2.2cm in diameter and carries a current of 50A. If the bird's feet are 4.0cm apart, calculate the potential difference across its body. 2.An x-ray tube used for cancer therapy operates at 4.0MV, with a beam current of 2 ...continues

Understanding the concepts.

A) Very often a sinking ship will turn over as it becomes immersed in water. Why? B) Is it true that a floating object will only be in stable equilibrium if its centre of buoyancy lies above its centre of gravity? C) Why should one take short steps rather than long ones when walking on ice?

Calculating the specific temperature that balls will sink in benzene.

Benzene has a density of 0.90gm/cm^3 at 0 deg C and a coefficient of cubical expansion of 0.0012 per deg Celsius. Wooden balls (of density 0.88g/cm^3) therefore float in it at 0 deg Celsius. If the wood has a mean coefficient of linear expansion of 4 x 10^-5 per deg Celsius, calculate at what temperature the balls will just sink ...continues

Calculating the temperature gradient in a bar whose one end is kept in ice and the other in steam.

A uniform copper bar 50 cm long is insulated on the sides and has its ends exposed to ice and steam respectively. If there is a layer of water 0.1 mm thick at each end, calculate the temperature gradient in the bar at steady state. Thermal conductivity of copper = 1.04 cgs units Thermal conductivity of water = 0.0014 cgs u ...continues

Thermodynamics explanations

(1)Explain why a beaker filled with water at 4 degree celcius overflows if the temperature is decreased or increased (2)Mercury boils at a temperature of 357Degree Celcius. How then can mercury thermometers be used to measure temperatures up to 500 Deg Celcius ? (3)Two thermometers are constructed in the same way except t ...continues

Energy and momentum for an electron and a proton

An electron has a total energy equal to 5 times its rest energy. A. What is its momentum? B. Repeat for a proton.

Physics

Velocity and acceleration

Physics

Velocity and acceleration

One-Dimensional Kinematics

A hot air balloon has just lifted off and is rising at the constant rate of 2.2 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. Her friend throws it to her staight up at and initial speed of 10 m/s if the passenger is 2.5 m above the friend when the camera is tossed, how high is she when th ...continues

Calculating ion field paths

1.A singly charged positive ion has a mass of 2.5*10^-26kg. After being accelerated through a potential difference of 250V, the ion enter a magnetic field of 0.50T, in a direction perpendicular to the field. Find the radius of the path of the ion in the field. 2.Two ions with masses of 5.1*10^-26kg move out of the slit of ...continues