Physics Answers

A sound wave of frequency 300Hz travels with speed 340ms–¹along the negative x-direction. Each point of the medium moves up and down through a total distance of 5.0mm. Determine the necessary parameters to represent the wave mathematically.

A force of 250 N exerted at an angle of 30° above the horizontal is needed to keep a 90 kg block moving along a

cement floor. Find the coefficient of kinetic friction.

Calculate the time taken for a car to cover a distance of 100m if the initial speed is 10km/h and it constant acceleration of 1.5m/s

2.) 20J of work are required to move 2.0C of charge between two points in an electric field. a.)Find the electric potential difference between the two points.

3.)How much work would be required to move 5.0C of charge between the same two points of the problem above?

Please answer with a detailed explanation & Solution.

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What is the maximum kinetic energy in eV of electrons ejected from sodium metal by 450-NM EM radiation, given that the binding energy is 2.28 eV

Alyssa dropped the golf ball from the 5th floor of the hotel and hits the ground for 5 seconds later. How tall is a 5th floor hotel?

A piece of metal has a mass of 200 g in air and 170 g when immersed in water. Calculate its volume and density. [Density of water is 1000 kgm-3. Take g=9.8 ms-2 ]

Joanne drives her car with a mass of 1000 kg at a speed of 20 m/s. Show that to bring her car to a halt in 10 s, road friction must exert a force of 2000 N on the car. 

Two spherical objects have masses of 7.5 x 10⁸ kg and 6.5 x 10⁸ kg. Their centers are separated by a distance of 2.5 x 10⁶ m.

The resting potential of the crab limb nerve is 89 mV. What is the

concentration of potassium ions inside the nerve, if it is 12mmol/1 outside?

Take the temperature equal to 20°C