Physics test 5

A force of 250 N is applied to a hydraulic jack piston that is 0.02 m in diameter. If the piston that supports the load has a diameter of 0.15 m, approximately how much mass can be lifted by the jack? Ignore any difference in height between the pistons.

(N/9.8) (D2/D1)^2

Water enters a pipe of diameter 3.0 cm with a velocity of 3.0 m/s. The water encounters a constriction where its velocity is 15 m/s. What is thediameter of the constricted portion of the pipe?

(pie x r1^2 x V1) = (pie x r2^2 x V2)

If the frequency of the motion of a simple harmonic oscillator is doubled, by what factor does the maximum acceleration of the oscillator change?

4

If the frequency of the motion of a simple harmonic oscillator is doubled, by what factor does the maximum speed of the oscillator change?

4

A simple harmonic oscillator is undergoing oscillations with an amplitude A. Howfar is it from its equilibrium position when the kinetic and potential energies are equal?

A/squareroot2

What is the total force exerted on the bottom of the swimming pool?

A=l x w F= P x A

What is the amplitude of vibration?

A=vmax/w w=squareroot(K/m)

the drawing shows three containers filled to the same height with the same fluid. In which container, if any, is the pressure at the bottom greatest?

All three containers have the same pressure at the bottom.

Which one of the following statements concerning a completely enclosed fluid is true?

Any change in applied pressure produces an equal change in pressure at all points within the fluid.

A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.0 m3. The density of air is 1.3 kg/m3. What is the average density of the balloon?

D=m/v

A balloon inflated with helium gas (density = 0.2 kg/m3) has a volume of 6 × 10-3m3. If the density of air is 1.3 kg/m3, what isthe buoyant force exerted on the balloon?

Fb= Pfluid x Vfluid x g

The intensity of a spherical wave 2.5 m from the source is 120 W/m2. What is the intensity at a point 9.0 m away from the source?

I2= (i1 x r1^2)/(r2^2)

A barometer is taken from the base to the top of a 279-m tower. Assuming the density of air is 1.29 kg/m3, what is the measured change in pressure?

P= DxgxH

A u-shaped tube is connected to a flexible tube that has amembrane-covered funnel on the opposite end as shown in the drawing. Justin finds that no matter which way he orients to membrane, the height of the liquid in the u-shaped tube does not change. Which of the following choices best describes this behavior?

Pascal's principle

A child wants to pump up a bicycle tire so that its pressure is 1.2 × 105Pa above that of atmospheric pressure. If the child uses a pump with a circular piston 0.035 m in diameter, what force must the child exert?

R=D/2 A=pieR^2 F=PxA

Will the balloonrise, fall, or remain stationary; and why?

The balloon will rise because the upward buoyant force is greater than its weight.

Blood flows through a section of a horizontal artery that is partially blocked by a deposit along the artery wall. A hemoglobin molecule moves from the narrow region into the wider region. What happens to the pressure acting on the molecule?

The pressure increases.

A mass is attached to a spring and oscillates with a period T. If the mass is doubled, what is the new period?

Tsquareroot2

On the Moon, the acceleration of gravity is g/6. If a pendulum has a period Ton Earth, what will its period be on the Moon?

Tsquareroot6

What is the wavelength of a wave with a speed of9.0 m/s and a period of 0.33 s?

a= (v) (T)

The speed of sound in a certain metal block is 2.00 × 103m/s. The graph shows the amplitude (in meters) of a wave traveling through the block versus time (in milliseconds). What is the wavelength of this wave?

a= (v)(T) T= 2x10^-3

A wave has a frequency of 58 Hz and a speed of 31 m/s. What is the wavelength of this wave?

a= v/f

The position of a mass that is oscillating on a spring is given by x= (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?

acoswt amax=w^2a

The position of a mass that is oscillating on a spring is given by x= (12.3 cm) cos[(1.26 s-1)t]. What is the speed of the mass when t= 0.805 s?

acoswt v=-wasinwt

A periodic wave is produced on a stretched string. Which one of the following properties is notrelated to the speed of the wave?

amplitude

A periodic wave travels along a stretched string in the direction shown by the arrow. The sketch shows a "snapshot" of the pulse at a certain instant. Points A, B, and C are on the string. Which entry in the table below correctly describes how particles of string between A and B and between B and C are moving?

between Aand B: down between B and C: up

A stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train's engineer. If the speed of sound is 343 m/s, how far away is the reflecting surface?

d= v x t d= d/2

Using the value of atmospheric pressure at sea level, 1 × 105Pa,estimate the total mass of the earth's atmosphere above a 5-m2area.

d=P/9.8 m=areaxd

A mass on a spring undergoes SHM. When the mass is at maximum displacement from equilibrium, its instantaneous acceleration

is a maximum

A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, its instantaneous velocity

is maximum.

A mass on a spring undergoes SHM. When the mass is at its maximum displacement from equilibrium, its instantaneous velocity

is zero.

During a single period, the distance traveled by a wave is

one wavelength.

Two liquids, 1 and 2, are in equilibrium in a U-tube that is open at both ends, as in the drawing. The liquids do not mix, and liquid 1 rests on top of liquid 2. How is the density of liquid 1 related to the density of liquid 2?

p1 is less than p2

An in-ground swimming pool has the dimensions shown in the drawing. It is filled with water to a uniform depth of 3.00 m.The density of water = 1.00 ×103kg/m3.

p=p0 + pgh

In simple harmonic motion, the speed is greatest at that point in the cycle when

the magnitude of the acceleration is a minimum.

A mass oscillates on the end of a spring, both on Earth and on the Moon. Where is the period the greatest?

the same on both Earth and the Moon

speed of mass

v=-wasinwt

The density of gold is 19 300 kg/m3. What is the mass of a gold sphere whose diameter is 0.25 m?

v=4/3pieR^3 m=DxV

At standard temperature and pressure, carbon dioxide has a density of 1.98 kg/m3. What volume does 1.70 kg of carbon dioxide occupy at standard temperature and pressure?

v=m/p

At what location are the kinetic energy and the potential energy the same?

x=a(squareroot2/2)

A transverse periodic wave described by the expression

y= Asin2pie (t/T + x/a) v= a/T remember transverse so its the first over the last

A transverse periodic wave is established on a string. The wave is described by the expression y= 0.005 sin(20.0x-2ft)

y=Asin (Kx-wt) k=2pie/a v=af v=20