Other Physics Answers

The kinetic energy of a car is 8 ´ 10⁶ J as it travels along a horizontal road. How much power is required to stop the car in 10 s?

if the source of light is moving towards the observer, then the speed of light received by the observer will be:

A)decreased

B)increased

C)remain same

D)maximum

An insulating sphere with radius of 20cm carries a uniform volume charge density of 1.5×10-⁶ C/m³. Find the magnitude of the electric field at a point inside the sphere that lies 8.0 cm from the center

A person does 360J of work in 3.2s to accelerate a bike at 13m/s^2. This changed the velocity by 31m/s. How heavy is the bike. The bike moved 26m

Consider a hollow spherical conductive shell of radius (R) 0.2 m with a fixed

charge of +2.0 x 10-6 C uniformly distributed on its surface.

a. What is the electric field at all points inside the sphere? Express your answer as

a function of the distance r from the center of the sphere. (2 points)

b. What is the electric field outside the sphere? Express your answer as a function

of the distance r from the center of the sphere. (2 points)

c. What if the sphere is a solid conductive sphere? What is the electric field at all

points inside the sphere? Express your answer as function of the distance r from

the center of the sphere

A proton beam through a region of space where the magnetic field is a uniform value of 5.0 T directed along the positive z-axis. The protons have a velocity of magnitude 4.0 x 10⁵ m/s in the xz plane at an angle of 30° to the positive z-axis. Find the force on the portion

The critical angle for material C is 570. If an incident ray approaches the boundary between material C and the air at 590, the refracted ray will lie along the boundary between the material.

A stone is tossed straight upwards from a height of 2 meters with an initial positive velocity

of 30 m/s. If time it takes to hit the ground is 10 seconds, what is the maximum height it

reaches from the ground?

We want to design an airport runway with the following specifications. The lowest acceleration of a plane should be  

4m/s2

and its take-off speed is 75 m/s. How long would the runway be to allow the planes to accelerate through it?

A model of a helicopter rotor has four blades, each 3.40 m long from the central shaft to the blade tip. The model is rotated in a wind tunnel at 550 rev/min. What is the radial acceleration (in m/s²) of the blade tip?