Physics Questions and Answers November 14, 2023

The energy in an atom: a) is all stored in one energy state b) is equally shared among states that are equally spaced in energy c) is distributed hierarchically in discrete states that are not equally spaced in energy d) does not escape because the nuclear force is so strong

What physical principle explains the fact that the Earth continues to execute the 'same' orbit about the Sun every year? a) two equal and opposite forces act on the Earth b) no force acts on the Earth so it doesn't change orbit c) the Moon balances the gravitational pull of the Sun d) conservation of momentum and/or conservation of energy

What did you notice about the angle of refraction as the wavelength decreased? Why did you think that happened? What does that tell us about the index of refraction?

a. What is the amplitude of the oscillation? b. What is the frequency of the oscillation?

A 50cmlong spring is suspended from the ceiling. A 370 g mass is connected to the end and held at rest with the spring unstretched. The mass is released and falls, stretching the spring by 16 cm before coming to rest at its lowest point. It then continues to oscillate vertically.

1. A force of 8 x 102 N Is needed to push a car across a lot. Two Students push the car 40m . How much work is done ? 2 . How much work is done In lifting a 60 kg crate a vertical distance of 10m?

A 3.2-m-diameter merry-go-round with rotational inertia 100 kg . m is spinning freely at 0.60 rev /s . Four 25- kg children sit suddenly on the edge of the merry-go-round. a, Find the new angular speed. round. Express your answer using two significant figures. b. Determine the total energy lost to friction between the children and the

1. A person comes a 34N package from the ground floor to the fifth floor of an office building, or 18m upward. How much work does the person do to move the package? 2. what work is done to lift a 419 kg crate a distance of 10 m?

You wish to purchase a telescope that is easy to transport from one location to another. You finally decide on one with a barrel length of 1.49 m and an angular magnification of 76.5. Determine the following. (a) the focal length of the objective (b) the focal length of the eyepiece

1. A crane does 4114 J of work while lifting a 1766 N statue onto a pedestal. How high does the crane lift the statue? 2. A helicopter scoops a load of water out of a lake, to dump on a forest fire. The helicopter exerts 6480 N of force on the water while rising high enough to fly over a mountain. If the helicopter does 1.62 x 10 6 J of work on

You do 168 J of work on a 67 N box while carrying it up a flight of stairs. If there are 16 steps in the flight of stairs, how high is each step?

A house jack must lift 112,000 lbs. The screw pitch is 0.125 inches and the screw diameter is 3.00 inches. Find the length of the handle to lift the load when a person applies a force of 75.0 lbs. to the handle.

A motorcycle generates 50W of power. The torque is 50.0 N m. What is the angular velocity? in rad/s.

Una compresora centrifuga gira a 25000 rev/min, el ojo tiene un dimetro medio de 48mm y la periferie 200 mm El pre-giro a la entrada tiene un valor de 40 m/s. El flujo de masa es de 0.3 kg/s. La componente de la velocidad de giro a la salida es de 140 m/s. La temperatura de entrada es de 7C, encontrar el trabajo realizado por el rotor, la torsin

Con que velocidad en rev/min deber girar una compresora centrifuga de dimetro mayor 150 mm, si se desea una razn de presin de 5/1. El rendimiento Isentrpico es de 82%, la temperatura de entrada 12C. Debido a diseo no existe pre-giro. El factor de deslizamiento es de 0.88. Que potencia ser requerida si el flujo de masa es de 0.2 kg/s. Qu ocurrira

Un compresor de flujo axial de 9 etapas y con una razn de presin de 9/1 tiene las razones de presin iguales por etapa, para una de las etapas la temperatura de entrada es de 50 C, el rendimiento isentrpico es de 85%, la velocidad media del alabe tiene una velocidad lineal de 220 m/s y la velocidad axial constante de 170 m/s. Determinar los ngulos