Physics Answers

A conductor has a diameter of 3.0 mm. How many meters of this

material is needed to have a resistance of 1ohm? The resistivity of the

conductor is 1.68 x10−8 Ω. m

A battery powered torch uses a 9 V battery and dissipates 0.25 W of electrical power in the bulb.

If the torch is used for 1.0 hours then how much charge has passed through the bulb?

What is the speed of the ant that covers 1.5 meters in 60 seconds?

The critical angle for material C is 570. If an incident ray approaches the boundary between material C and the air at 590, the light ray will be bent back and total internal reflection happens. True or False.

A 23 kg object is pushed up an inclined plane with angle of inclination of 14 degrees. The coefficient of kinetic friction between the object and the incline is 0.30. Determine the acceleration of the object if it is pushed by a 250 N force that is acting parallel to the incline.

A 23 kg object is pushed up an inclined plane with angle of inclination of 14

0.The coefficient of kinetic friction between the object and the incline is 0.30. Determine the acceleration of the object if it is pushed by a 250 N force that is acting parallel to the incline.

A 1.5 nC particle with an initial velocity of 4.75x106 m/s along the positive x-axis enters a region of uniform magnetic field and electric field The magnetic field is 3.25 T along the positive y-axis calculate the magnitude and direction of the electric field if the particle passes the region undeflected

A 7.70-kg steel ball at 18.7°C is dropped from a height of 12.7 m into an insulated container with 4.50 L of water at 10.1°C. If no water splashes, what is the final temperature of the water and steel? The specific heat of steel and water is 450 J/(kg·K) and 4186 J/(kg·K) respectively.

How much internal energy is generated when a 19.8-g lead bullet, traveling at 7.80 × 102 m/s, comes to a stop as it strikes a metal plate?

A system takes in 0.380 kJ of heat while it does 0.790 kJ of work on the surroundings. What is the change in internal energy of the system?