What are the advantages and disadvantages of radiation delivered through radiopharmaceutical or via an external source

in a basketball game a referee throws the basketball upwards from an initial height of 2.00 meters above the floor, with sufficient initial speed such that its highest point will be 4.20 meters above the floor. a basketball players outstretched hand is 2.50 meters above the floor when he holds his hand above his head, and he can jump with an initial speed of 3.90m/s upwards. how long after the ball is released from the referees hand should the player jump in order to reachthe ball just as his highest point of his jump, if he is to do so (a) while the ball is still on its way up, and (b) when the ball is on its way back down?

7) a) What is the energy emitted in 1 minute from a black coffee mug which has a radius of 4 cm and height 6 cm and temperature of 70 Fahrenheit. What will the answer be if the coffee mug is at 200 Fahrenheit?

b) Now, assume the mug is completely filled with creamed coffee. Assume both of their temperatures are initially at 200 Fahrenheit and the atmospheric temperature is 70 Fahrenheit. How long will it take each one to reach 71 F ignoring the transfer of heat to each other by conduction? (Take the density of the coffee to be 1.1 g/cm3 , its specific heat to be .95 cal/g.C and the mass of the cup to be 200 grams and its specific heat to be .4 cal/g.C. Also, take the emissivity of the creamed coffee to be

Answer: a) E = 512.84 Joules, E = 1233.92 Joules b) tcoffee = 190.8 hrs, tcup = 3.64 hrs

Two objects with masses of m₁ = 3.20 kg and m₂ = 7.90 kg are connected by a light string that passes over a frictionless pulley, as in the figure below.

A string passes over a pulley which is suspended from a horizontal surface. A circular object of mass m₁ and a rectangular object of m₂ are, respectively, attached to the left and right ends of the string.

(a) Determine the tension in the string. N

(b) Determine the acceleration of each object. (Enter the magnitude only.)
m/s²

(c) Determine the distance each object will move in the first second of motion if both objects start from rest.

V1=1000 m/s, V2=1800 m/s, V3= 800 m/s, V4= 1400 m/s

angle1= 35 deg, angle2= 60 deg, angle3= 130 deg, angle4= 340 deg.

1.) Find the sum V in cartesian and polar coordinates of V1=1000 m/s, V2=1800 m/s 2.) Find the difference of V in polar and cartesian coordinates for V3= 800 m/s and V4= 1400 m/s. The angles are angle1= 35 deg, angle2= 60 deg, angle3= 130 deg, angle4= 340 deg.

Three objects are located as follows: 3.70 kg at (0, +12.0 m), 2.80 kg at (-16.0 m, 0), and 7.40 kg at (+35.0 m, 0). Find the:

A) center of mass.

B) magnitude and direction of the force of gravity on the 3.70 kg object.

C) total gravitational potential energy of the system

The dynamic duo of Je’Kai and Oluwalani have an acrobatic routine where Je’Kai applies a 112 N external force to Oluwalani’s horizontally outstretched right leg at a point x = 0.35 m and y = 0.03 m with his hip socket as the origin. Find the torque vector about the hip socket (origin) if the applied force during the routine points in (a) the x-direction only and (b) if it points in the z-direction only. Suppose that the 112 N external force is directed vertically down through his leg’s center of mass, in the y-direction, but does not include the 155 N weight of his own leg. If his rectus femoris in his quadricep is capable of applying a force of 925 N along the muscle at an angle of 21˚ above the horizontal at an attachment point of x = 0.45 m from the hip socket, then (c) is the rectus femoris alone capable of sustaining his leg in this position?

Torque and Energy

You are working with your friend to build a brick fireplace. The contractor dropped 1000 - 1 kg bricks at the base of your driveway which must be carted to the build site in wheelbarrows.

Your wheelbarrow has handles that are a total of 2 m long (from the wheel to your hands), with the barrow located at 1 m (from the wheel to the center of mass of the barrow).

Your friend has a wheelbarrow where the handles are a total of 1.5 m long, with the barrow located at 0.5 m.

(A) Draw a schematic diagram of the two wheelbarrows and the forces based on the problem description.

(B) Assuming you were to load each wheelbarrow with 100 kg of bricks, which wheelbarrow will be easier to use (require less force to move)?

c) If you can lift with a maximum force of 100 N, and your friend can lift with a maximum force of 125 N, how many bricks can each of you lift in your wheelbarrow?

(D) If you and your friend make the same number of trips using your own wheelbarrows, how many trips will it take for you to move all the bricks to the build site?

(E) Ignoring wheelbarrows, and thinking of this simply in terms of energy, how much work will it take to move 1000 – 1 kg bricks from your driveway to the build site, if the distance is 50 m

(F) You are building the fireplace on a 1 m tall concrete base. Assuming the bricks all start out laying on the ground, what is the potential energy of the first layer of 15 bricks when they are placed on the 1m tall base.

A blue car with mass mc = 512 kg is moving east with a speed of vc = 17 m/s and collides with a purple truck with mass mt = 1397 kg that is moving south with an unknown speed. The two collide and lock together after the collision moving at an angle of θ = 56° South of East

1.What is the magnitude of the initial momentum of the car

2.What is the magnitude of the initial momentum of the truck

3.What is the speed of the truck before the collision

4. What is the magnitude of the momentum of the car-truck combination immediately after the collision

5. What is the speed of the car-truck combination immediately after the collision?

Boxcar #1 has a mass of 2000 kg.  Boxcar #2 has a mass of 1200 kg.  Boxcar #1 is moving at 12.00 m/s to the right before they hit and stick together.

A)         Suppose that the velocity of Boxcar #2 before the collision is 8.00 m/s to the right. What is the velocityafter the totally inelastic collision?

B)         Suppose, instead, that the speedafter the totally inelastic collision is 3.00 m/s.  What was the velocity of Boxcar #2 before the collision?  Give all possible answers.

Two 7.1 Ω resistors are connected in parallel, as are two 3.1 Ω resistors. These two combinations are then connected in series in a circuit with a 19 V battery. What is the current in each resistor? What is the voltage across each resistor?

given a two-level atomic system where level-2 is more energetic than the ground state level-1, what is the meaning of the expression      

dN₂/dt = B₁₂u_vN₁ -B₂₁u_vN₂-A₂₁N₂         when in thermal equilibrium show that     A₂₁N_{2 +} B₂₁u_vN₂ = B₂₁u_vN₁

A pickup truck with mass 2150 kg is traveling with a speed of 26.6 m/s, while a compact car of mass 1121 kg is traveling in the opposite direction with the same speed. The truck and car undergo a head-on collision and thereafter move together as a single body. What is the change in kinetic energy (AK) of the system consisting of both vehicles?
Help me please

Using the method of jones calculus show that the effect of a half wave plate on a circularly polarised state is to turn it into another circular state of the opposite handedness