therandomperson

Select one:

a. Pupils decrease in size when looking at a closer object

b. Pupils increase in size when looking at a closer object

c. Pupils stay the same size whether looking at far or near objects

d. Pupils change size in response to a change in light levels Incorrect

e. None

Estimate the smallest range of speeds you might find for a proton in the nucleus.

What is the kinetic energy, in MeV, of a proton with a de Broglie wavelength of 9 fm?

A tank holds a 1.44-m thick layer of oil that floats on a 0.96-m thick layer of brine. Both liquids are clear and do not intermix. Point O is at the bottom of the tank, on a vertical axis. The indices of refraction of the oil and the brine are 1.40 and 1.52, respectively. A ray originating at O crosses the brine-oil interface at a point 0.60 m from the axis. The ray continues and emerges into the air above the oil. What is the angle that the ray in the air makes with the vertical?

a)54°

b)57°

c)51°

d)60°

e)48°

Two stereo speakers mounted 4.52 m apart on a wall emit identical in-phase sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity drops to zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? CAREFUL! The distance to the wall is NOT much greater than the distance between the speakers.

a)2.6 m

b)1.7 m

c)2.1 m

d)2.9 m

A tube open at one end and closed at the other end produces sound having a fundamental frequency of 350 Hz. If you now open the closed end, the fundamental frequency becomes:

a)175 Hz.

b)700 Hz.

c)350 Hz.

d)87.5 Hz.

e)1400 Hz.

I think it's a)175Hz but i'm not too sure.

A 6-m wire with a mass of 40 g, is under tension. A transverse wave, for which the frequency is 730 Hz, the wavelength is 0.5 m, and the amplitude is 7.8 mm, is propagating on the wire. The time for a crest of this wave to travel the length of the wire is closest to:

a)20 ms.

b)18 ms.

c)16 ms.

d)22 ms.

e)14 ms.

I have to research the following topic: "The introduction of modern molecular techniques enabling the transfer of genes from one

organism to another (whether they are closely related or not), means that we have a new

class of "exotic" organisms which may escape or be released into the environment. Discuss

the possible consequence of such new invasions and consider whether they will be more or less damaging than the more traditional foreign exotics."

I was just wondering what the similarities and differences are between exotic and engineered species. Any help will be greatly appreciated.

State the equation for the speed of a wave on a string stretched with tensions Ts.Include a description of each of the variables involved in the equation, and their SI units.

Three +3.0-μC point charges are at the three corners of a square of side 0.50 m. The last corner is occupied by a −3.0-μC charge. Find the magnitude of the electric field at the center of the square. (k=1/4πϵ0=8.99×109 N · m2/C2)

https://session.masteringphysics.com/problemAsset/...

Two point charges, Q1=−1.0 μC and Q2=+4.0 μC, are placed as shown in the figure. (k=1/4πϵ0=8.99×109 N · m2/C2) The y component of the electric field, at the origin O, is closest to

https://session.masteringphysics.com/problemAsset/...

a) At which point or points is the electric field zero in figure (a)? (there could be more than 1 answer or no answer at all)

b) At which point or points is the electric field zero in figure (b)? (there could be more than 1 answer or no answer at all)

https://session.masteringphysics.com/problemAsset/...

a) Specify the strength of the electric field. Take r = 7.5 cm.

b) Specify the direction. (angle below horizontal)

a) At what x-coordinate could you place a proton so that it would experience no net force?

b) Would the net force be zero for an electron placed at the same position?

https://session.masteringphysics.com/problemAsset/...

The point charge at the bottom of the figure in the link above is Q = +6 nC, and the curve is a circular arc. What is the magnitude of the force on the charge Q due to the other point charges shown? (k = 1/4πε 0 = 8.99 × 109 N · m2/C2)

a) What is the electric field at the position (x1,y1)=(5.0cm,0cm)? Write electric field vector in component form.

b) What is the electric field at the position (x2,y2)=(−5.0cm,5.0cm)? Write electric field vector in component form.

c) What is the electric field at the position (x3,y3)=(−5.0cm,−5.0cm)? Write electric field vector in component form.

https://session.masteringphysics.com/problemAsset/...

The figure (in the link above) shows four charges at the corners of a square of side L. Assume q and Q are positive. What is the magnitude of the net force on q?

Give your answer in terms of Q, q, L and constant K.

A roadway for stunt drivers is designed for racecars moving at a speed of 97 m/s. A curved section of the roadway is a circular arc of 380 m radius. The roadway is banked so that a vehicle can go around the curve with the friction force from the road equal to zero. At what angle is the roadway banked?

a)68 deg b)70 deg c)62 deg d)64 deg e)66 deg

The figure shows two packages that start sliding down a 20° ramp from rest a distance d = 6.2 m along the ramp from the bottom. Package A has a mass of 5.0 kg and a coefficient of kinetic friction 0.20 between it and the ramp. Package B has a mass of 10 kg and a coefficient of kinetic friction 0.15 between it and the ramp. How long does it take package A to reach the bottom?

Figure: https://session.masteringphysics.com/problemAsset/...