sum1

the figure below is 33 ohms . Find the value of resistance R.

http://www.webassign.net/walker/21-30.gif

Consider the light beam shown in the figure, where d = 219 cm and θ = 30.0°. Suppose the separation between the two mirrors is increased by moving the top mirror upwards.

(a) Will this affect the number of reflections made by the beam of light?

(b) What is the total number of reflections made by the beam of light when the separation between the mirrors is 105 cm?

Figure: http://www.webassign.net/walker/26-43alt.gif

A friend in another city tells you that she has two organ pipes of different lengths, one open at both ends, the other open at one end only. In addition, she has determined that the beat frequency caused by the second-lowest frequency of each pipe is equal to the beat frequency caused by the sixth-lowest frequency of each pipe. Her challenge to you is to calculate the length of the organ pipe that is open at both ends, given that the length of the other pipe is 1.05 m. Note that there are two possible answers to this question. List them both, in the order indicated below.

shorter pipe ? meters

longer pipe ? meters

please help!

A friend in another city tells you that she has two organ pipes of different lengths, one open at both ends, the other open at one end only. In addition, she has determined that the beat frequency caused by the second-lowest frequency of each pipe is equal to the beat frequency caused by the sixth-lowest frequency of each pipe. Her challenge to you is to calculate the length of the organ pipe that is open at both ends, given that the length of the other pipe is 1.05 m. Note that there are two possible answers to this question. List them both, in the order indicated below.

shorter pipe ?m

longer pipe ?m

1. Suppose a bullet of mass m = 6.72 g is fired into a ballistic pendulum whose bob has a mass of M = 0.665 kg.

(a) If the bob rises to a height of 0.123 m, what was the initial speed of the bullet?

km/s

(b) What was the speed of the bullet-bob combination immediately after the collision takes place?

m/s

2. A bullet with a mass m = 7.8 g and an initial speed v0 = 322 m/s is fired into a ballistic pendulum. What mass must the bob have if the bullet-bob combination is to rise to a maximum height of 0.132 m after the collision? kg

I have no idea how to do these. Any help is appreciated

he lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires the gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.008 kg, and its velocity is +734 m/s. Her mass (including the gun) is 58 kg.

(a) What recoil velocity does she acquire in response to a single shot from a stationary position, assuming that no external force keeps her in place?

(b) Under the same assumption, what would be her recoil velocity if, instead, she shoots a blank cartridge that ejects a mass of 5.0 * 10-4 kg at a velocity of +734 m/s?

so i got part a,) which was -.101, but i cant seem to get the right answer.

i did 5e-4*734/58 and got -.006, but webassign keeps telling me it's wrong

help?

A communications satellite with a mass of 275 kg is in a circular orbit about the Earth. The radius of the orbit is 35,200 km as measured from the center of the Earth.

(a) Calculate the weight of the satellite on the surface of the Earth.

(b) Calculate the gravitational force exerted on the satellite by the Earth when it is in orbit.

at an angle θ = 25.0° above the horizontal

(a) What is the magnitude of the acceleration of the block?

(b) The force F is slowly increased. What is its value just before the block is lifted (completely) off the floor?

(c) What is the magnitude of the acceleration of the block just before it is lifted (completely) off the floor?

(a) Find the magnitude of the total resistive force exerted on the skier by the water and air.

(b) Find the magnitude of the upward force exerted on the skier by the water.

A bird watcher meanders through the woods, walking 0.30 km due east, 0.75 km due south, and 2.20 km in a direction 44.0° north of west. The time required for this trip is 3.00 h. Determine the magnitude and direction (relative to due west) of the bird watcher's a.) displacement and b.) average velocity.

I figured out the answers for part a and the magnitude for part b., but I can not figure out how to find the direction (in degrees north of west) of the average velocity. Please help!

A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.05 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.518 m/s2. Following this, the boat accelerates at -1.49 m/s2 for 8.65 s.

(a) What is the velocity of the boat at t = 21.7 s?

(b) Find the total displacement of the boat.

so i need some help on my chemistry hw:

could the volume of a regularly shaped object be determined by water displacement? explain

So I recently got a cellphone and I want to get a ringtone of one of my favorite songs but I don't exactly want to pay for it. Where do you get yours and does it have a good selection of songs?

Thanks! :)