In the production of radiopharmaceuticals, how is the radioisotope produced? and how is a 'radiopharmaceutical' formed from that radioisotope? What does the radioisotope get attached to in order to become a radiopharmaceutical?

How much work did the movers do to push a 47.0 kg crate 10.2 m across a rough floor at a speed of 2.2 m/s with a horizontal pushing force of 58 N ?

The diagram shows an isolated, positive
charge Q, where point B is twice as far away
from Q as point A.
+Q ____A____ B
0 10cm 20cm
What is the ratio of the electric field
strength at point A to the electric field
strength at point B?

Starting from rest, a car accelerates at 3m/s2 until it reaches a constant speed of 15m/s. After traveling at 15m/s for 12s, the brakes are applied so that the car comes to a stop, taking 3 s to do so. (Please show formulas)

A. Prepare visual overview of the situation. Your overview must include a pictorial representation that defines the coordinate system, a motion diagram, and an annotated velocity vs. time graph.

B.What total distance did the car travel?

C. The magnitude of the braking force required to bring the car to a stop was 2000N . What is the mass of the car?

A springboard diver jumps up and comes back to the level of the board after 0.81 s. What was her speed as she leaves the board? How high (above the board) did she reach? A toy rocket stops accelerating when it reaches a height of 30 m. Its speed is 30 m/s at this point and continues upward. Take time to be zero at this point. (a) How fast is it moving when it is at a height of 40.0 m? (b) How much time is required from t = 0 to reach this height? (c) Why are there two answers to (b)?

- Comparer a typical CT radiation dose to that of a planar x-ray and explain why there is a difference?

The question is asking for a comparison between CT radiation and X-ray ( planner) !!

1. A powered model airplane of mass 1.77 kg is tied to a ceiling with string and allowed to fly at speed 0.44 m/s in a circular path of radius 0.44 m while suspended by the string which makes a constant angle with respect to the vertical. (a) What is the angle, in degrees, that the string takes such that the above is true? (b) What is the tension in the string, in N?

I have a hard time understanding the subject of fictitious forces. Let's discuss a few examples:

1) I'm sitting inside a vehicle which is accelerating in a straight line. I feel like someone is pushing me to the seat. So, on the one hand, I'm told that this happens according to the third Newton's law: this pressure is the result of me pushing the seat as a reaction to the seat pushing me (because it is accelerating with the same acceleration as the car). On the other hand, these forces are acting on different objects and I'm told that there is another fictitious force acting on me in an opposite direction to the acceleration. So what is right? And if there is a fictitious force, then why some call it a "math trick" when they are real and I can feel them?

2) I do not understand why some call centrifugal force a fictitious force. The earth is pulling the earth with its "invisible" string called gravitation. That's why the moon is still there. And this is the centripetal force. However the moon is also pulling the earth according to the Newton's third law, and that's why we have tides. This is the centrifugal force. So why it is fictitious? What it has to do with frame of reference? When we observe this in non-inertial frame of reference (such as the moon), does it simply mean that we can't call it anymore a reaction force according to the Newton's third law? But why if it is virtually the reaction force?

3) Accelerating elevator - similar to the first example - let's say the elevator is accelerating upwards. So we get that N? =m(g+a), and that's the same as me pushing the floor. That is why I feel heavier. Then why some add to here the fictitious force?

I will appreciate any answer.

make a table with three column, and write the similarities and differences for the three forces, 1. Gravitational Force 2. Colomb Force 3. Magnetic Force Make pictures to explain the differences.

Using the information provided in Lecture #3, compare the amount of energy released by chemical and nuclear reactions, given an identical mass of fuel. Describe two features of nuclear weapons design which reflect the physical differences between chemical and nuclear reactions.

In the figure, four charges, given in multiples of 5.00Ý10-6 C form the corners of a square and four more charges lie at the midpoints of the sides of the square. The distance between adjacent charges on the perimeter of the square is d = 3.60Ý10-2 m. What are the magnitude and direction of the electric field at the center of the square? The magnitude of E? Ex? Ey?

A ball of mass 500g is shot with an initial velocity of 10 m/s. the ball hits a pendulum bob (initially at rest) of mass of 2kg and the collision is perfectly elastic. a) find the velocity of the pendulum bob immediately after the collision. b) find the length of the pendulum if it comes to rest after turning by an angle of 30 degrees.

- Part b is the one I am stuck on!!!

A. Germanium is a semiconductor. If small amounts of the elements In, P, Sb, or Ga are placed into the Ge as impurities (not at the same time but in four separate instances) what types of semiconductors are manufactured in the four cases?

B. Normally, in conducting materials, we think of current as being carried by electrons as they move through a solid. In semiconductors, it is also common to talk about the current being carried by the “holes” in the valence band.

a. Explain how “holes” move through a solid material

b. If, in a p-type semiconductor device, electric current is moving from left to right, in which direction will the holes be moving?

A bullet of mass 2.7 g strikes a ballistic pendulum of mass 2.7 kg. The center of mass of the pendulum rises a vertical distance of 11 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.