848

Physics Properties Of Matter Level: High School

What is the net upward force on an airplane wing of area 20 m^2 if the speed of flow is 300 m/s across the top of the wing and 280 m/s across the bottom ?

847

Physics Properties Of Matter Level: High School

A steel safe of weight 1.00 x 10^4 N . is being raised to the top of a building. The steel cable to be used was only 15 m long and so an additional 7 m length of another cable had to be used . If both cables have a diameter of 1.00 cm , and the total stretch of both cables put together is 2.35 cm , What is the Young’s modulus of the second cable ? The weight of both cables is negligible compared to that of the safe .

846

Physics Properties Of Matter Level: High School

Pressure

Suppose that a girl weighing 125 pounds is wearing “spike” heel shoes . If she surface of the heel in contact with th floor corresponds to a square measuring ¼ on each side , and if she stands momentarily with all her weight on one heel , what is the pressure she exerts on the floor ?

125 lbs/in^2

500 lbs/in^2

1000 lbs/in^2

1250 lbs/in^2

2000 lbs/in^2

845

Physics Properties Of Matter Level: High School

Archimedes Principle

A glass container is half-filled with mercury , and a steel ball is floating on the mercury . If water is then poured on top of the steel ball and mercury , filling the glass , What will happen to the steel ball ?

a. It will float higher in the mercury .

b. It will float at the same height . v

c. It will float lower in the mercury .

d. It will sink to the bottom of the mercury .

It will float higher in the mercury .

when water is poured , there will be an up thrust (or apparent loss in weight) of the steel ball due to the water displaced by it . Thus , steel ball will becomes slightly lighter and so it will displace less of Hg to counter balance its weight .

844

Physics Properties Of Matter Level: High School

Elasticity

When a force F is applied to a certain rod , there is a 1 cm change in length . If that same force is applied to a rod that is three times bigger in each dimension , what will be the change in length ?

9 cm

3 cm

1 cm

0.33 cm

0.667 cm

843

Physics Properties Of Matter Level: High School

A large stone is resting on the bottom of the swimming pool . The normal force of the bottom of the pool on the stone

a. is equal to the weight of the stone

b. is equal to the weight of the water displaced

c. is equal to the sum of the weight of the stone and the weight of the displaced water.

d. is equal to the difference between the weight of the stone and the weight of the displaced water.

Is equal to the difference between the weight of the stone and the weight of the displaced water . This will be the apparent weight of the stone according to Archimede’s Principle .

842

Physics Properties Of Matter Level: High School

Which of the following states of matter is associated with the very highest of temperatures ?

Liquid

Plasma

Gas

Solid

Plasma

841

Physics Properties Of Matter Level: High School

Write Bernoulli’s equation for fluid flow . Give some example of types of problems that this equation may be applied to , and review the conditions under which some of the terms of the equation may cancel out or be equal to zero . Thus simplifying the equation .

840

Physics Properties Of Matter Level: High School

Fluids

What is meant by flow rate in fluids ?
Flow rate of fluids means the volume of the fluids coming out through a cross section per unit time . SI unit will be m^3/s .

839

Physics Properties Of Matter Level: High School

Fluid

Are there some simplifications you can make to Bernoulli’s equation to help solve some common types of problems ? Include diagrams .

838

Physics Properties Of Matter Level: High School

Hydrostatic pressure

Water is filled to height H behind a dam of width w (see figure at “click here”) . Determine the resultant force exerted by the water on the dam . (Hint: The pressure is not constant for this problem , it varies with depth .)

834

Physics Properties Of Matter Level: High School

Elasticity

The weight that will cause a wire of diameter d to stretch a given distance , for a fixed length of wire , is

Proportional to d^2

Independent to d

Independent of what the length of the wire is

Proportional to d

833

Physics Properties Of Matter Level: High School

Which two temperature changes are equivalent ?

1 degree F = 1 degree C

1 degree C = 1 K

1 K = 1 degree F

1 degree C = 1 K

828

Physics Properties Of Matter Level: High School

Gases

Both the pressure and volume of a given sample of an ideal gas double . This means that its temperature in Kelvin must .

Reduce to one-fourth its original value .

Reduce to one-half its original value .

Remain unchanged

Double

827

Physics Properties Of Matter Level: High School

Gases

The kinetic theory of gases suggests that the average kinetic energy per molecule of an ideal (mono-atomic)gas is .

kT

3/2 kT

2 kT

1/2 kT

3/2 k T

Displaying 451-465 of 522 results.