1. A vibrating string is cut in half. The fundamental frequency of the string will be...

a. doubled

b. unchanged

c. reduced by half

2.On a pipe organ, for a closed pipe, if you double the length of the pipe, what happens to the fundamental frequency?

a. It does not change.

b. It doubles.

c. It is reduced by half.

d. It is reduced by 1/4.

e. It is increased 4x.

3. When you blow gently across the top of a particular soda bottle, it emits a tone. The column of air in the bottle is vibrating up and down in its fundamental mode. If you replace the air in the bottle with something heavier than air (like carbon dioxide) and then blow gently across the top of the bottle, it will emit

a) a higher pitched tone. b) a tone at the same pitch as before.

c) no sound at all. d) a lower pitched tone.

9. If you blow across the top of a half full bottle of soda you can produce a clear tone. If you take a drink of soda to reduce the amount of liquid in the bottle and try this again the pitch (frequency) of the sound produced will

a) increase. b) stay the same.

c) exactly double. d) decrease.

An ac generator has a frequency of 7.5 kHz and a voltage of 35 V. When an inductor is connected between the terminals of this generator, the current in the inductor is 30 mA. What is the inductance of the inductor?

An energy saving lamp with a power of P = 11 W emits an electromagnetic wave uniformly in all directions. Calculate the wave at a distance of r = 3 m from the lamp

(a) the intensity

(b) the radiation pressure

(c) electric field amplitude

(d) the amplitude of the magnetic field

What are probable healt effects of:

• Ozone
• Partiuclate matter
• Sulfur Oxide
• Lead
• Carbon Monoxide
• Nitrogen Dioxide

To children, average adults, and the elderly??

(include your sources)

A mysterious tower has been constructed at the edge of a gridiron football field. Even more mysteriously, the field has been marked carefully in meters instead of yards. On top of the tower is a well calibrate ball launcher that will fire heavy ball at a velocity of 14.7 m/s at an angle of 20 degrees abive the horizontal. The ball lands 46.1 meters away from the base of the tower.

A) How long does it take for the ball to reach max height?

B)How long does it take for the ball to return to the height from which it was launched?

C) What is the total flight time of the ball?

D) How tall is the tower?

Please explain the contiguity of spacetime?

A magnetic field is along the xy plane and the z plane is perpendicular to the magnetic field. In which plane(s) is the magnetic flux the greatest? Please explain.

At t = 0s, the leading edge of a wave (wavelength 1m) is 3m to the left of a boundary. The wave is moving to the right at 1m/s. The transmitted wave has wavelength 3m. (You may draw pictures to help you answer the questions below, but you must explicitly state - in words - the answers to the questions.)

(a)[8 pt(s) ]At t = 5s, where is the leading edge of the transmitted wave? Is the transmitted wave inverted or non-inverted, and why?

A 16.5-μμF capacitor is charged to a potential of 60.0 V and then discharged through a 75.0­ ΩΩ resistor.

1)

How long after discharge begins does it take for the capacitor to lose 90.0% of its initial charge? (Express your answer to three significant figures.)

answer .....ms

How long after discharge begins does it take for the capacitor to lose 90.0% of its initial energy? (Express your answer to three significant figures.)

answer .....ms

What is the current through the resistor at the time when the capacitor has lost 90.0% of its initial charge? (Express your answer to three significant figures.)

answer .....mA

What is the current through the resistor at the time when the capacitor has lost 90.0% of its initial energy? (Express your answer to three significant figures.)

answer ....mA

Projectile Motion 2D

A batter hits a ball with initial speed 20m/s at a launch angle of 60

A hollow, thin-walled sphere of mass 11.0 kg and diameter 48.0 cm is rotating about an axle through its center. The angle (in radians) through which it turns as a function of time (in seconds) is given by θ(t)=At2+Bt4, where A has numerical value 1.20 and Bhas numerical value 1.60.

At the time 3.00 s , find the angular momentum of the sphere.

At the time 3.00 s , find the net torque on the sphere.

Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that exerted on the truck. To substantiate this view, they point out that the car is crushed, whereas the truck is only dented. This idea of unequal forces, of course, is false; Newton's third law tells us that both objects are acted upon by forces of the same magnitude. The truck suffers less damage because it is made of stronger metal. But what about the two drivers? Do they experience the same forces? To answer this question, suppose that each vehicle is initially moving at 6.40 m/s and that they undergo a perfectly inelastic head-on collision. Each driver has mass 72.0 kg. Including the masses of the drivers, the total masses of the vehicles are 800 kg for the car and 4,000 kg for the truck. If the collision time is 0.100 s, what force does the seat belt exert on each driver? force on truck driver N force on car driver N

A large boulder is ejected vertically upward from a volcano with an initial speed of 40.7 m/s . Air resistance may be ignored. A) At what time after being ejected is the boulder moving at a speed 20.3 m/s upward? B) At what time is it moving at a speed 20.3 m/s downward? C)When is the displacement of the boulder from its initial position zero? D)When is the velocity of the boulder zero? E)What is the magnitude of the acceleration while the boulder is moving? F)What is the direction of the acceleration while the boulder is moving? (up or down)

Throw a ball so that it is projected vertically upward. Catch it at the same height it was released. Have a partner measure the time the ball is in the air - that is, from the time of release to the time the ball lands in your hand.

Throw a ball so that it is projected vertically upward. Catch it at the same height it was released. Have a partner measure the time the ball is in the air - that is, from the time of release to the time the ball lands in your hand.
Determine the velocity of the ball at the moment of release and the distance the ball traveled before it started its descent. Graph the flight of the ball into five sections: (1) from initiation of upward motion of the hand to just prior to release, (2) from moment of release to just before maximum height, (3) at maximum height, (4) from maximum height to just before you catch the ball, (5) from the ball contact to the ball being brought to rest. For each section, describe the displacement, velocity, and acceleration.

Determine the velocity of the ball at the moment of release and the distance the ball traveled before it started its descent. Graph the flight of the ball into five sections: (1) from initiation of upward motion of the hand to just prior to release, (2) from moment of release to just before maximum height, (3) at maximum height, (4) from maximum height to just before you catch the ball, (5) from the ball contact to the ball being brought to rest. For each section, describe the displacement, velocity, and acceleration.

A point particle with charge

q = 4.2 ?C

is placed on the x axis at

x = ?10 cm

and a second particle of charge

Q = 7.8 ?C

is placed on the x axis at

x = +25 cm.

(a) Determine the x and y components of the electric field due to this arrangement of charges at the point

(x, y) = (10, 10)

(the units here are centimeters).

(b) Determine the magnitude and direction of the electric field at this point.