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Ivani Nand

Ivani N.

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ANSWERED

Suman Saurav Thakur verified

Numerade educator

A 10kg block is pushed across a surface by the 50 N force. The block moves at a constant velocity of 2 m/s. How big is the coefficient of kinetic friction between the block and the surface?

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ANSWERED

Mahipal Kumawat verified

Numerade educator

If a material has a half-value layer of 3.0 mm, what is its linear attenuation coefficient?

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ANSWERED

Urvashi Arora verified

Numerade educator

Person 5m away from an x-ray source. By how much is the x-ray intensity decreased (from what is was when the person was 5m away from the source) if they move a further 5m away from the source?

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ANSWERED

Urvashi Arora verified

Numerade educator

The highest point that a soccer ball (launched by an air cannon), can reach is 50 metres above the ground when the ball is launched from the ground at an angle of 30° above the horizontal. What is the ball’s launch speed? Assume that air friction is negligible in your calculations.

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ANSWERED

Urvashi Arora verified

Numerade educator

Wanting to measure the speed of sound on a hot humid day, a person mounts a loud battery powered speaker (which emits a frequency of 1300 Hz) on a scooter and then drives directly towards a stationary observer at 8 m/s. The stationary observer hears a frequency of 1350 Hz. What is speed of sound on this day?

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ANSWERED

Mahipal Kumawat verified

Numerade educator

If the temperature of a gas in a rigid sealed container changes from 17 ? to 80? , by what factor does the sound speed in the gas change?

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INSTANT ANSWER

Two converging lenses are separated by 16.0 cm. The focal length of each lens is 10.0 cm. An object is placed 26.0 cm to the left of the lens that is on the left. Determine the magnification of the final image as seen through the two lenses.

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Khoobchandra Agrawal verified

Numerade educator

Two charged metal plates (8 m wide by 12 m high) are placed parallel to each other and are separated by 2 cm of vacuum (kvacuum = 1) as in the diagram below. A helium nucleus (charge +3.2×10–19 C) is placed 1 cm to the left of plate B as shown in the diagram. The helium nucleus experiences an electric force of 2 x 10?14 N to the left i.e. towards plate A. What is the magnitude of the voltage between the plates and which plate is at the higher voltage?

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ANSWERED

Mahipal Kumawat verified

Numerade educator

An image in front of a concave mirror is located 15 cm from the mirror. The radius of curvature of the mirror is 13 cm. How far in front of the mirror is the object?

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INSTANT ANSWER

A monatomic ideal gas has an initial temperature of 405 K. This gas expands and does the same amount of work whether the expansion is adiabatic or isothermal. When the expansion is adiabatic, the final temperature of the gas is 245 K. What is the ratio of the final to the initial volume when the expansion is isothermal?

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