Physics Answers

The distance between the electrodes is 3.6 cm. If the dielectric strength of the dry air between the electrodes is 6 x106 V/m, what is the voltage across the electrodes when the arc first forms

A 800 kg car travels at 25 m/s behind another car (905 kg) that travels at 15 m/s. The two cars collided and were locked together after collision. Determine the velocity of the vehicle after collision.

• 10. A rocket ship has a mass of 1.50 x 105 kg. Its relativistic momentum is 3.00 x 1012 kg•m/s. How fast is the rocket ship traveling?

• How fast would a meterstick be moving so that its length will be observed to shrink to half its original length?

• How much work must be done to a proton to accelerate it from rest to 0.998c.

• A person on Earth observes a space ship approaching from the right with a velocity of 0.75c and a rocket ship approaching from the left at 0.50c. What is the relative velocity of the two ships as measured by a passenger in each of them?

An aluminium baseball has a coefficient of volume expansion of 69×19-⁶°C-¹, the bat has a length of 0.86m at a temperature of 25°C. When the temperature of the bat is increased,the bat expands by 0.00016m. Determine the final temperature of the bat

Near the equator, the earth's magnetic field points almost horizontally to the north and has magnitude B = 0.5 x 10 ^-4 T. What should be the magnitude and direction for the velocity of an electron if its weight is exactly balanced by the magnetic pole? 

A ball rolls off the edge of a horizontal platform 2meters high and lands 2.5 meters from the edge of the platform. Find (a) the time of its flight and; (b) its initial horizontal velocity

A car is accelerated uniformly at 0.15 m per second squared to a speed of 15 m/s.the speed is maintained for 3min,and it is retardaded uniformly to come rest in 8min after starting.draw the velocity time graph and use it to find the average velocity.

What is the distance of center of gravity from center of buoyancy, if the depth of center of gravity from the top of the barge is 0.55m?

A trumpet creates a sound intensity level of 112 dB at a distance of 2.75 m. (a) What is the sound intensity of a trumpet at this distance. (b) What is the sound intensity of seven trumpets played simultaneously at this distance? (c) Calculate the sound intensity level of the seven trumpets played simultaneously at this distance.

What is the force of repulsion between two small charges 75.0 cm apart if each has a charge of 1.65 x 10 -12 C?