P202-total

what must be done to a capacitor in order to increase the amount of charge it can hold (for a constant voltage)?

(either a or b) increase the area of the plates, decrease separation between the plates

which of the following statements about Gauss's law are correct?

the electric flux passing through a Gaussian surface depends only on the amount of charge inside that surface, not on its size or shape

you have a long pipe and a short pipe. which one has the higher frequency?

the short pipe

a proton and an electron are in constant electric field created by oppositely charged plates. You release the proton from the positve side and the electron from the negative side. what feels the larger electronic force

they feel the same magnitude force but in opposite directions

Two balls with charges +Q and +4Q are fixed at a separation distance of 3R. Is it possible to place another charged ball Q0 on the line between the two charges such that the net force on Q0 will be zero?

yes, independent of the sign (or value) of Q0

What must be done to a capacitor in order to increase the amount of charge it can hold for a constant voltage?

Increase the area of the plates or decrease the separation between the plates

two point charges and a point P lie at the vertices of an equilaterial triagnle as shown. Both point charges have the same magnitude q but opposite signs. There is nothing at point P. the net electric field that charges #1 and #2 produce at point P is in the

+x direction

if, ƛ= 5.0m v= 2.5 m/s what is the Frequency

.5 Hz f= v/ ƛ

You drop a stone from rest into a well that is 7.35m deep. How long does it take before you hear the splash?

1.24s

three capacitors are connected as shown in the figure what is the equivalent capacitance between points a and b

1.7 uf

two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8cm. what is the magnitude of the electric force on each of them

1/16N

How much work is needed to carry an electron from the positive terminal to the negative terminal of a 9.0V battery?

14.4 x 10^-19 J

A parallel-plate capacitor consists of two parallel, square plates that have dimensions 1.0cm by 1.0cm. If the plates are separated by 1.0mm and the space between them is filled with teflon, what is the capacitance of this capacitor? The dielectric constant for teflon is 2.35.

2.1 x 10^-12

If an electron is accelerated from rest through a potential difference of 1500V, what speed does it reach?

2.3 x 10^7 m/s

Two tiny particles carrying like charges of the same magnitude are 1.0 mm apart. If the electric force on one of them is 5.0 N what is the magnitude of the charge on each of these particles?(k= 9.0x10^9 N*m^2 /C^2) 2.4 X10^-6 C 2.4x10^-8 C 4.5x10^-8 C 4.5x10^-9 C

2.4x10^-8 C

Assume that the voltage of the battery is 9V and that the three resistors are identical. What is the potential difference across each resistor?

3 V

An ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance?

4C

where an electric field line crosses an equipotential surface, the angle between the field line and the equipotential is

90°

four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. which one of the arrows shown represents the net force acting on the center stage

A

An asteroid of mass 58,000 kg carrying a charge of 15uC is 180m from the second asteroid of mass 52,000 kg carrying a charge of 11 uC.What is the magnitude of the net force the asteroids exert upon each other, assuming we can treat them as point particles A) 0.000040N B) 0.0062 N C) 570,000 N D) 510,000 N

A) 0.000040N

When you rub a plastic rod with fur, the plastic rod becomes negatively charged and the fur becomes positively charged. As a consequence of rubbing the rod with the fur A. the rod and fur both gain mass B. the rod and fur both lose mass C. the rod gains mass and the fur loses mass D. the rod loses mass and the fur gains mass E. none of the above

C. The rod gains mass and the fur loses mass

After one bee left a flower with a positive charge, that bee flew away and another bee with the same amount of positive charge flew close to the plant. Which diagram best represents the electric field lines between the bee and the flower?

C. all arrows pointing away from both bee and flower. They are repelled by each other

Capacitor C1 is connected across a battery of 5 V. An identical capacitor C2 is connected across a battery of 10 V. Which one has more charge

C2

Capacitor C1 is connected across a battery of 5 V. An identical capacitor C2 is connected across a battery of 10 V. Which one has more charge?

C2

You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed & you perceive the frequency as 1340 Hz. You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1300Hz. What is the speed of the police car? The speed of sound in air is 343 m/s. A) 38.4 m/s B) 30 m/s C) 39.2 m/s D) 40.1 m/s E) 41.7 m/s

D) 40.1 m/s

Four point charges are arranged at the corners of a square. Find the electric field E and the potential V at the center of the square.

E is not equal to 0 and V = 0

Four point charges are arranged at the corners of a square. Find the electric field E and the potential V at the center of the square

E ≠ 0, V= 0

A system of 1525 particles, each of which is either an electron or a proton, has a net charge of −5.456x10^-17C a)How many electrons are in this system? b)What is the mass of this system?

Mass 933( 9.11*10^-31kg) + 592 (1.67*10^-27kg)= 9.91*10^-25kg

A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which feels the larger acceleration?

The electron because F=ma and the mass of an electron is much smaller than the mass of a proton

A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which feels the larger electric force?

They both experience the same force but the forces point in opposite directions because the proton and electron are oppositely charged

A boat is moored in a fixed location, and waves make it move up & down. If the spacing between wave crests is 20m & the speed of the waves is 5m/s, how long does it take the boat to go from the top of a crest to the bottom of a trough.

b) 2 seconds

At a football game, the "wave" might circulate through the stands & move around the stadium. In this wave motion, people stand up & sit down as the wave passes. What type of wave would this be characterized as?

b) Transverse Waves

You hear a fire truck with a certain intensity, &you are about 1 mile away. Another person hears the same fire truck with an intensity that is about 10 times less. Roughly, how far is the other person from the fire truck?

b) about 3 miles

Do sound waves travel faster in water or in ice?

b) ice

what is the direction electric field at the center of the square

c

A police car has an 800Hz siren. It is traveling at 35.0 m/s on a day when the speed of sound through air is 340 m/s. The car approaches & passes an observer who is standing along the roadside. What change of frequency does the observer hear?

c) 166 Hz

What is the frequency of the fundamental mode of vibration of a steel piano wire stretched to a tension of 440N? The wire is 0.6m long & has a mass of 5.60g? A) 517 Hz B) 234 Hz C) 181 Hz D) 312 Hz E) 366 Hz

c) 181 Hz

What is the charge on 1.0 kg of protons? (e= 1.6*10^-19 C) Mass(proton)= 1.67*10^-27 kg?

c) 9.67x10^7 C

Two balls with charges +Q & +4Q are fixed at a separation distance of 7R. Is it possible to place another charged ball Q0 on the line between the two charges such that the net force on Q0will be zero? a) yes, but only if Q0 is positive b) yes, but only if Q0is negative c) yes, independent of the sign (or value) of Q0 d) no, the net force can never be zero

c) yes, independent of the sign (or value)

Speakers A and B emit sound waves of λ=1m, which interfere constructively at a donkey located 200m far away. What happens to the sound intensity if speaker A steps back 2.5m? a)Intensity increases b)Intensity stays the same c)Intensity goes to zero

c)Intensity goes to zero

Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? a)one is positive, the other is negative b) both are positive c) both are negative d) both are positive or both are negative

d) both are positive or both are negative

When 1.0 uC point charge is 18m from a second point charge, the force each one experiences a force of 1.0 uN. What is the magnitude of the second charge? a)16 nC b)25 nC c)30 nC d)36 nC

d)36 nC

a proton and an electron are in constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which has the larger acceleration?

electron

the electron-volt is a unit of

energy

Two space heaters in your living room are operated at 120 V. Heater 1 has twice the resistance of heater 2. Which one will give off more heat?

heater 2

do sound waves travel faster in water or in ice

ice

if the electric potential at a point in space is zero, then the electric field at that point must be

impossible to determine based on the information given

Suppose you have two point charges of the opposite sign. As you move them farther and farther apart, the potential energy of this system

increases

speakers A and B emit sound waves of ʎ= 1m, which interfere constructively at a donkey located far away (say,200m). What happens to the sound intensity if speaker A steps back 2.5m?

intensity goes to zero

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod

is repelled by the sphere

what is the wavelength of the wave shown in the figure?

it cannot be determined from the given information

The figure shows a Gaussian surface with rectangular sides and a positive point charge +q at its center. If all of the dimensions of the Gaussian surface double, but charge +q remains at its center, the electric flux through the surface will

remain the same