Physics Problems from Users and Solved

A 4 kg block ‘A’ and a 3 kg block ‘B’ are pushed together against a spring, and are tied with a cord. When cord breaks, the 3 kg block moves to the right at 18 km/s. What is the velocity of the 4 kg block?

Calculate a) the circumference of a circle of radius 3.5 cm and , b) area of a circle of radius 4.65 cm

Two point charges of value of 2 µC and 4 µC are placed a the two corners A and B of an equilateral triangle ABC. The work done in moving a charges of 8 µC from point C to the mid point of AB will be ...

Of the 600 mg of potassium in a large banana, 0.0117% is radioactive K-40, which has a half-life, </2 of 1.25 × 109 y. What is the activity of the banana? MK = 39.102 g / mol

Calculate the change in kinetic energy of a ball of mass 800 g when it bounces. assume that it hits the ground with a speed of 20 m/s and leaves it at 18.5 m/s.

A shell is fired horizontally from a powerful gun located 144 ft above a horizontal plane  with a muzzle speed of 800 ft/sec. (a) How long does the shell remain in the air? (b) What is  its range? (c) What is the magnitude of the vertical component of its velocity as it strikes the  target?

Two infinite sheets sheets A and B are separated by a distance d=30 m. If the charge density is a=-a=10nc/m^2. Find the potential difference between the sheets. The value of the Energy required?

Sunset is defined as the instant that the top of the sun disappears below the horizon. How long is it from the time when the bottom of the sun hits the horizon until the instant of sunset assuming that you are standing on the equator on March 21 ( the orbital radius of earth is 1.5 x 10^ 11 ,the radius radius of sun is 6.99 x 10^8 m).

Consider a uniform line change of length 2l placed along x axis with center at the origin and line charge density 2= kx² where is a constant. Find the electric field at a distance 2 about the midpoint.

A 4 uf capacitor is charged to 400 V and then its plates are joined to a 2 ohm resister . Heat produced in resister is ...?

What is the speed of sound in air at 20 centigrade?

300 g Aluminum with 90% purity reacts with an HCl solution of C % = 40. It is required: a) Chemical reaction equation; b) pure aluminum mass; c) ms HCl; d)VH2 for p=1.5 atm and T=27 • C; e) Cm=?;

Two electric point charges of equal size are 15 cm apart and interact with a force of 8.1 N. What is the modulus of these charges?

The speed of an object at the end of 4 successive seconds is 20, 25, 30, 35 mph km/hr respectively the acceleration of the object is: a) 5m/s^2; b) 5km/hr^2; c) 5km/hr/s; d) 5k sec^2