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A 60-ohm electric lamp if left connected to a 240-volt line for 3.0 min. How much energy is taken from the line?
Sound above the frequency of 20000 Hz is called
A mass of 8 kg is above a given datum, where local g is 9.70 m/s^2. Calculate the gravitational force with respect to the datum?
Suppose that energy Q is required to accelerate a car from rest to v, neglecting friction. How much added energy would be required to increase the speed from v to 2v?
Heat will flow from one body to another in thermal contact with it, when they differ in
Who determined the quantitative relationship between the amount of electricity used in electrolysis and the amount of chemical reaction that occurs?
When the two waves of the same frequency, speed and amplitude traveling in opposite directions are superimposed,
“At any point along a streamline in an ideal fluid in steady flow, the sum of the pressure, the potential energy per unit volume and the kinetic energy per unit volume have the same value.” The concept is known as
Which of the following about the speed of sound is correct?
Material a is a water and material b is a glass with index of refraction 1.52. If the incident ray makes an angle of 60o with the normal, find the direction of the reflected ray.
A 1-hp motor is rated at 1kW. What is its efficiency?
“The Acceleration of a particular body is directly proportional to the resultant force acting on it and inversely proportional to its mass” is a statement of
Which of the following is true? The density of water
When a substance is heated, its
On decreasing the pressure, the boiling point of water will
At the boiling point of liquid, the vapor pressure
Normal range of the frequency of sound, which the human beings can hear, is
A 3.5 lb weight hangs at the end of a spring with k = 20 lb/ft. The weight is pulled slightly and released. Calculate at what frequency it will vibrate?
A wave in which the particles of the material move up and down as the waves goes from left is called a
