Other Physics Answers

A battery powered toy car accelerates from 0.0 m/s to 8.5 m/s. It’s mass is 0.55 kg. The chemical store in its battery is decreased by 30 J. Calculate the efficiency of this process.

Our eyes have to balance between focus and the amount of light. When we’re in a dark space, the slit in our eyes will open up. Using the concept of diffraction, how does this affect the image that we see? How does the effects of diffraction, and a wider slit (in the dark) affect the image we see?

With her great love of Physics,Sydney designs a spring -block system as shown. The first block is fixed to a spring with a spring constant of 120 N/m, which is in turn fixed to a wall.The mass of the first block is 2.3 kg while the second is 5.8 kg She wants to determine the velocity of the two blocks when

block 2 has fallen a distance of 0.80 m as it stretches the spring. The coefficient of friction between the first block and the surface is 0.21.What is the velocity of the blocks?

Bored after so many days at home,and being the daredevil that he is Dylan decides to test the laws of

Physics. He decides to slide down his roof on his skateboard, and then jump off it to land into a

pile mowed grass, some distance away from his house. The roof of the house is 3.77 m in length and has an angle of 60.0º to the horizontal.His skateboard has coefficient of kinetic friction of 0.15

with the roof Dylan slides from the top of the roof down until he reaches the end, where he then jumps of it with a velocity of 6.0 m/s at an angle of 90.0º relative to the rooftop. The bottom of the roof is 10.06 m from the ground. If Dylan has a mass of 62 kg, how far from the house does Dylan

land?

At Canada’s Wonderland, Hideiki and Nicolas decide to go on the bumper cars. The bumper cars have

a mass of 320 kg each while Nicolas has a mass of 72 kg and Hideiki

has a mass of 63 kg. However , Hideki always obsessed with Physics, has brought with him a stack of his favourite Physics books. Although riveting reading, they are exceptionally large and heavy. On the ride, Nicolas uses his amazing NASCAR driving skills and smashes into a stationary

Hideikiin a head on elastic collision. After the collision, Hideiki’s car moves with a speed that is 97% of

Nicolas’s original speed. Assuming all surfaces are frictionless, what is the mass of Hideiki’s

books? [7 A, 2 C]

Re-calculate the weight for the same objects, if they were on Mercury (where the acceleration due to gravity is 4N/kg)

Assuming that the object was on Earth, where acceleration due to gravity is 10N/kg, calculate the gravitational potential energy that they had.

Yoda pushes a 23.5 kg chair across the floor with a for F = 17.4N [W]. If the chair moves at constant velocity, what is the coefficient of friction,μ between the chair and the floor ?

the speed of light in a vacuum is 3.00 x 10^8 m/s. if the reflective index of diamond is 2.42 what speed does a light travel as it passes through a diamond?

1. A hypothetical materials has a relative permeability and relative permittivity of 3.0 and 4.0, respectively. (a) what is the speed of light in this material?. (b) what is the index of refraction of the material?. (c) what is the value of the magnetic field if the electric is 3.5 N/C.
2. A light of a wavelength 53nm (nano-meter) passes from air to glass (flint) plate (n=1.66). The plate has a thickness of 47 x 10*-9 m. (a) how long will it take the light to pass perpendicularly through the plate. (b) what is the wavelength of light in the zirconium plate?