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Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 10-Mechanical Properties of Fluids

Explain why (a) To keep a piece of paper horizontal, you should blow over, not under, it. (b) When... read more

Explain why
(a) To keep a piece of paper horizontal, you should blow over, not under, it.
(b) When we try to close a water tap with our fingers, fast jets of water gush through the openings between our fingers.
(c) The size of a needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection.
(d) A fluid flowing out of a small hole in a vessel results in a backward thurst on the vessel.
(e) A spinning cricket ball in air does not follow a parabolic trajectory.

read less

Answer

Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 10-Mechanical Properties of Fluids

What is the pressure inside a drop of mercury of radius 3.0 mm at room temperature? Surface tension of... read more
What is the pressure inside a drop of mercury of radius 3.0 mm at room temperature? Surface tension of mercury at that temperature (20°C) is 4.65 x 10-1 Nm-1. The atmospheric pressure is 1.01 x 105 Pa. Also give the excess pressure inside the drop. read less

Answer

Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 10-Mechanical Properties of Fluids

A tank with a square base of area 1.0 m2 is divided by a vertical partition in the middle. The bottom... read more
A tank with a square base of area 1.0 m2 is divided by a vertical partition in the middle. The bottom of the partition has a small-hinged door of area 20 cm2. The tank is filled with water in one compartment, and an acid (of relative density 1.7) in the other, both to a height of 4.0 m. Compute the force necessary to keep the door close. read less

Answer

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Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 11-Thermal Properties of Matter

A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500°C and then placed on... read more
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500°C and then placed on a large ice block. What is the maximum amount of ice that can melt? Specific heat of copper is 0.39 Jg-1°C-1. Heat of fusion of water = 335 Jg-1. read less

Answer

Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 7-Properties of Bulk Matter/Chapter 11-Thermal Properties of Matter

In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150°C is dropped... read more
In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150°C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cm3 of water at 27 °C. The final temperature is 40° C. Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal? read less

Answer

Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 9-Kinetic Theory of Gases/Chapter 13-Kinetic Theory

Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP.’... read more

Estimate the fraction of molecular volume to the actual volume occupied by oxygen gas at STP.’ Take the diameter of an oxygen molecule to be 3 A. read less

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Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 10-Oscillation & Waves/Chapter 14-Oscillations

Plot the corresponding reference circle for each of the following simple harmonic motions. Indicate the... read more
Plot the corresponding reference circle for each of the following simple harmonic motions. Indicate the initial (t = 0) position of the particle, the radius of the circle, and the angular speed of the rotating particle. For simplicity, the sense of rotation may be fixed to be anti-clockwise in every case:
(x is in cm and t is in s)
(a) x = – 2 sin (3t + π /3)
(b) x = cos (π /6 – t)
(c) x = 3 sin (2πt + π /4)
(d) x = 2 cos π t. read less

Answer

Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 10-Oscillation & Waves/Chapter 14-Oscillations

The acceleration due to gravity on the surface of moon is 1.7 ms-2. What is the time period of a simple... read more
The acceleration due to gravity on the surface of moon is 1.7 ms-2. What is the time period of a simple pendulum on the surface of moon if its time-period on the surface of Earth is 3.5 s? (g on the surface of Earth is 9.8 ms-2 .) read less

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Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 10-Oscillation & Waves/Chapter 15-Waves

A bat emits ultrasonic sound of frequency 1000 kHz in air. If this sound meets a water surface, what... read more
A bat emits ultrasonic sound of frequency 1000 kHz in air. If this sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air = 340 ms-1 and in water = 1486 ms-1. read less

Answer

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Asked 1 day ago CBSE/Class 11/Science/Physics/Unit 10-Oscillation & Waves/Chapter 15-Waves

A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound... read more
A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in a tissue in which the speed of sound is 1.7 km s-1? The operating frequency of the scanner is 4.2 MHz. read less

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