A Decibel is a

Who determined the quantitative relationship between the amount of electricity used in electrolysis and the amount of chemical reaction that occurs?

Cohesion is the attraction between like

What is the work done in a piston-cylinder system that contains 0.5 cu meter of air initially at 150 kPA and 50 degrees Celsius if the temperature remains constant while the volume is decreased to a quarter of the original volume?

The energy stored in a starched elastic material such as spring is

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.

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?

The surface of the thermos flask is silvered for minimizing heat transfer by what process

In fluid mechanics, this shows that the pressure of a fluid decreases as the speed of the fluid increases. In addition, the pressure of a fluid decreases as the elevation increases

The work done by all forces except the gravitational force is always equal to the one of the system

A person’s mass is 75.2 kg. If the person walks up a flight of stairs 12.6 m high in 28 s at constant velocity, what is the power output?

The amount of heat needed to change solid to liquid is

Which of the following thermometers is best suited for measuring a temperature of nearly 1500oC?

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?

The instrument, which measures temperature by radiation, is called

Sound above the frequency of 20000 Hz is called

A spaceship moving away from Earth with speed of 0.900c fires a robot space probe in the same direction as its motion, with speed of 0.700c relative to the spaceship. What is the probe’s velocity relative to the Earth?

The amount of heat which is absorbed during the change of state of a substance without rise in its temperature is called its

Which one of the following processes of heat transfer requires the presence of a fluid?