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Thermal conductivity comparison

Which of the following cylindrical rods of the same material with its ends at the same steady difference of temperature will conduct maximum heat ? 1. Lenght 100 cm & radius 1 cm 2. length 200 cm & radius 1 cm 3. length 400 cm & radius 2 cm 4. length 100 cm & radius 2 cm

Subject:

Physics

Topic:

Classical Mechanics

Posting ID:

7680

OTA ID:

102509

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Lactometer: finding graduations

Two graduations on the stem of a lactometer are 0.6 and 0.9. Find the graduation exactly midway between them.

Subject:

Physics

Topic:

Classical Mechanics

Posting ID:

7681

OTA ID:

102509

View Details $1.99 Download Add to Cart

Driving at night: Safe speed

Explain how the range of a car's headlights limits the safe driving speed at night

Subject:

Physics

Topic:

Classical Mechanics

Posting ID:

7682

OTA ID:

102509

View Details $1.99 Download Add to Cart

Whirling stone: Maximum velocity

A man whirls a stone round his head on the end of a string 2 m long. Can the string be in a horizontal plane ? If the stone has a mass of 200g and the string will break if the tension exceeds 4 Newton, what is the smallest angle the string can make with the horizontal ? What is then the speed of the stone ? Take g = 10m/s^2

Subject:

Physics

Topic:

Classical Mechanics

Posting ID:

7683

OTA ID:

102509

View Details $1.99 Download Add to Cart

An object is held stationary by a cable near the sea floor. Find the cable tension.

An apparatus consisting of a wood block of density 650 kg/m^3 and mass M= 64 kg, is attached by a cable to a cement block of density 4500 kg/m^3 and mass 125 kg. The cement block rests on the sea bottom, and holds the wood block stationary above it. The sea density is 1025 kg/m^3. Find the tension in the cable.

Subject:

Physics

Topic:

Classical Mechanics

Posting ID:

7714

OTA ID:

102950

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