The diffusion coefficient of a large protein molecule is found to be 2.2×10^-13 m²/s in the water at 20∘C. Assuming it is spherical with a density of 1.3×10³ kg/m³, compute its molar mass.

Does the gravitational force of a satellite changes depending on the orbit it follows

A large cyclotron directs a beam of He++ nuclei onto a target with a beam current of 0.245 mA.

(a) How many He++ nuclei per second is this? He++ nuclei/s

(b) How long (in s) does it take for 1.35 C to strike the target? s

(c) How long (in s) before 1.20 mol of He++ nuclei strike the target? s

Please show step by step with legible writing. Thank you

n object with mass 100 kg moved in outer space. When it was at location <6, -26, -7> its speed was 6.0 m/s. A single constant force <230, 310, -120> N acted on the object while the object moved from location <6, -26, -7> m to location <12, -22, -11> m. Then a different single constant force <100, 260, 120> N acted on the object while the object moved from location <12, -22, -11> m to location <16, -27, -6> m. What is the speed of the object at this final location? final speed = m/s

A tennis ball is lobbed (from very close to the ground) at a speed of 11.5 m/s and an angle of 47.9 degrees to the horizontal. (a) Find the horizontal distance traveled by the ball (the range) (b) At what other angle will one obtain the same range? (c) Which angle gives the highest point attained by the ball and what is this maximum height? (In all cases ignore air resistance)

A small metal sphere, A, carrying a charge of +15.0μC is at the origin. An identical sphere, B, carrying a charge of -18.0μC is at~ xB= 4.0ˆi cm and a third sphere, C,carrying +25.0μC is at~x C= 3.0ˆj cm.

(a) Find the total electrical force exerted on sphere A.

(b) Let us view sphere A as a probe charge which we are using to measure the field due to spheres B and C. Use your result from part b) to find the electric field (note that this is a vector) at the origin.

(c) Sphere A is released so that it is free to move. It has a mass of 5.0 g and no forces other than the electrostatic forces found in a) act on it. What is its acceleration at the instant of release?

(d) A short time later will your answer from c) still be the correct acceleration for sphere A?

(e) Spheres B and C are touched together and then returned to their original locations.Sphere A is also returned to its original location. Now what is the force on sphere A?

Hello, I have three questions.

1. What happens to the amount of air resistance on your car as you drive faster?

2. When will an object falling through air reach terminal velocity?

3. What is the net force and acceleration of an object that has reached terminal velocity?

Two carts sit on a horizontal, frictionless track; the spring between them is compressed. The small cart has mass m, and the mass of the larger cart is M = 5.29m. NOTE: Every velocity needs magnitude and direction (given by the sign).

a) Suppose the carts are initially at rest, and after the "explosion" the smaller cart is moving at velocity v = +4.88 m/s. - Find the velocity of the larger cart. V =

Assume now that the mass of the smaller cart is m = 8.91 kg. Assuming there is no loss of energy: find the energy stored in the spring before the explosion. Wk =

If the spring has spring constant k = 935 N/m: find x, the distance the spring was compressed before the "explosion".

b) Suppose the carts are initially moving together, with the spring compressed between them, at constant velocity vo = +9.39 m/s. After the "explosion", the smaller cart is moving at velocity v = +4.88 m/s. Find the velocity of the larger cart.

c) Suppose now that the small cart (mass m) is initially moving at velocity vo = +3.3 m/s. At what velocity would the large cart (mass 5.29m) have to be moving so, when they collide and stick together, they remain at rest?

If you can show the work/ provide explanation I would greatly appreciate it :) Thanks

How much of a gravitational redshift should you expect for a spectral line of the Sun observed in deep space if it has a rest wavelength of 121.6nm?

The potential in a region between x = 0 and x = 6.00 m is V = a + bx, where a = 12.6 V and b = -7.90 V/m.

(a) Determine the potential at x = 0.
______ V

Determine the potential at x = 3.00 m.
______ V

Determine the potential at x = 6.00 m.
______ V

(b) Determine the magnitude and direction of the electric field at x = 0.

Determine the magnitude and direction of the electric field at x = 3.00 m.

Determine the magnitude and direction of the electric field at x = 6.00 m.

A square insulating sheet 70.0 cm on a side is held horizontally. The sheet has 3.50 nC of charge spread uniformly over its area. Part A Calculate the magnitude of the electric field at a point 0.100 mm above the center of the sheet. Express your answer with the appropriate units. E E = nothing nothing Request Answer Part B Estimate the magnitude of the electric field at a point located a distance 200 m above the center of the sheet. Estimate the magnitude of the electric field at a point located a distance 200 above the center of the sheet. E = 2.25×10−5 N/C E = 9.83×10−5 N/C E = 7.87×10−4 N/C E = 1.10×10−2 N/C Request Answer Part C Would the answers to parts A and B be different if the sheet were made of a conducting material? Select the correct answer and explanation. Would the answers to parts and be different if the sheet were made of a conducting material? Select the correct answer and explanation. The charge would automatically spread out evenly over both faces, giving it half the charge density on either face as the insulator and the same electric field only close to the sheet. The answer to part A would not change, but the answer to part B would change. The charge would automatically spread out evenly over both faces, giving it half the charge density on either face as the insulator and changing the sign of the electric field. Both answers would change. The charge would automatically spread out evenly over both faces, giving it half the charge density on either face as the insulator and changing the electric field. Far away, they both look like points with the same charge. The answer to part B would not change, but the answer to part A would change. The charge would automatically spread out evenly over both faces, giving it half the charge density on either face as the insulator but the same electric field. Far away, they both look like points with the same charge. Neither answer would change.

Which of the following statements are true for the photoelectric effect? Give all the correct answers, e.g., enter ABC.

1. 
   
2. The maximum kinetic energy of the ejected electrons is proportional to the velocity of the incoming photons.
3. The maximum kinetic energy of the ejected electrons increases linearly with the frequency of the incident light.
4. The frequency of the incoming photons must be larger than a certain minimum value in order to eject electrons from the metal.
5. The maximum kinetic energy of the ejected electrons increases linearly with the intensity of the incident light.

What does "Electric potential is the negative line integral of electric field" mean?