physics calculations 15 points

Homework questions, hope u guys can help:

1. photo : http://s4.postimg.org/6qzwil525/Wires_3.jpg


a) Two long current carrying wires each carry a current of I = 1.94 A in the direction shown in the diagram above. The point Q is x = 5.15 cm from both wires, while P is 5.15 cm from wire 2 as shown in the diagram.

Calculate the force per meter that wire 1 exerts on wire 2.

Answer: ? N/m

b) Choose the best description of the direction of this force.

Select one:

a. Up the screen
b. Down the screen
c. Into the screen
d. Out of the screen
e. To the left
f. To the right
g. It has no direction as it is zero


c) Calculate the size of the magnetic field at Q due to the two wires.

Answer: ? T


d) Choose the best description of the direction of this field.

Select one:
a. Up the screen
b. Down the screen
c. Into the screen
d. Out of the screen
e. To the left
f. To the right
g. It has no direction as it is zero


e) Calculate the size of the magnetic field at P due to the two wires.

Answer ____T


f) Choose the best description of the direction of this field.

Select one:
a. Up the screen
b. Down the screen
c. Into the screen
d. Out of the screen
e. To the left
f. To the right
g. It has no direction as it is zero


2.

a ) In a galaxy far, far away a planet orbits its sun. The planet has a mass 7.50 × 1024 kg while the sun has a mass 2.67 × 1030 kg. The planet is a distance R = 2.85 ×108 km from the sun and has a radius of r = 7.75 × 103 km. This is still in our universe so the universal gravitational constant is G = 6.673 × 10-11 Nm2kg-2.

photo :http://s9.postimg.org/yakr8041b/Sun_planet.jpg

Planet oribiting sun

Calculate the acceleration due to gravity on the surface of this planet.

g = Answer ＿＿＿ms-2


b) What would be the magnitude of the force that the sun exerts on the planet?

Answer ____N


c) What would be the length of one year for this planet?

Answer ____s



Thanks!!