In a police rifle test, a 15-g bullet traveling 213 m/s in a vertical direction suddenly buries itself in a 2.4-kg block of wood at rest directly above it. As a result, the bullet-block combination moves vertically upward.

(a) Determine the velocity of the bullet-block combination just after the impact.

(b) Determine the maximum height reached by the bullet/block combination.

(c) Is kinetic energy conserved in this collision?   

Planets X, Y, and Z have circular orbits around a Star, which is similar to our own Sun. Given the data listed below, answer the following questions.

Note: "Days" are treated as "Earth days", thus having 24 hrs.

a) Use the data for Planet X to calculate the mass of this star.  

b) Use the data of of Planet Y to determine its period.

c) Use the data of Planet Z to determine its orbital radius.

A uniform, solid sphere of radius 5.00 cmand mass 1.75 kgstarts with a purely translational speed of 3.25 m/sat the top of an inclined plane. The surface of the incline is 1.75 mlong, and is tilted at an angle of 24.0∘with respect to the horizontal. Assuming the sphere rolls without slipping down the incline, calculate the sphere's final translational speed ?2at the bottom of the ramp.

A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative x direction and has a magnitude of 3.50 mT. At one instant the velocity of the proton is in the positive y direction and has a magnitude of 1830 m/s. At that instant, what is the magnitude of the net force acting on the proton if the electric field is (a) in the positive z direction and has a magnitude of 5.10 V/m, (b) in the negative z direction and has a magnitude of 5.10 V/m, and (c) in the positive x direction and has a magnitude of 5.10 V/m?

1. Plot a graph of Table 2. Consider which variable (voltage or current) should be on the x and y axes.
2. What is the relationship between voltage and current? Use data from your graph to support your answer.
3. Estimate the slope of the linear line and record it in Table 3.
4. How does the value of the slope compare to the resistance you measured? Calculate the percent difference.
5. Use the results of your experiment to verify Ohm’s Law.

A 2kg block slides down a surface inclined at 30 degrees. In traveling 50cm its speed changes from 1 to 2 m/s. Find the work done by gravity and coefficient of kinetic friction?

purpose of the condenser in a refrigeration system? a) rejects heat from refrigerant b)absorbs heat into the refrigerant c) rejects heat from the condensing medium d) increases pressureand temp of the refrigerant

A block of mass 23 kg is set on top of a 37 degree incline with a hight of 13.5 m. The incline rests on a table that is 27.8 m above the ground on the planet Mercury (M = 3.285 * 10^23 kg, R = 1516 mi). The coefficient of kinetic friction between the block and the incline is 0.18. The gravitational acceleration on Mercury is 3.68 m/s.

How far from the base of the table does the block land?

4. Suppose a newborn panda bear of mass 98.0 kg is exhibiting uniform circular motion while

orbiting a neutron star of mass 1.50*10^21 kg and radius 3.50*10^5 m. The distance that the

bear maintains from the surface of the neutron star is 50:0 km. What is the magnitude of the

baby panda's tangential velocity?

A 80.0 kg ice hockey goalie, originally at rest, catches a 0.150 kg hockey puck slapped at him at a velocity of 18.0 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities (in m/s) be in this case? (Assume the original direction of the ice puck toward the goalie is in the positive direction. Indicate the direction with the sign of your answer.)

An object with mass 0.150 kg is acted on by an elastic restoring force with force constant 11.0 N/m . The object is set into oscillation with an initial potential energy of 0.130 J and an initial kinetic energy of 5.10×10⁻² J .

1. What is the amplitude of oscillation?

2. What is the potential energy when the displacement is one-half the amplitude?

3. At what displacement are the kinetic and potential energies equal?

4. What is the value of the phase angle ϕ if the initial velocity is positive and the initial displacement is negative?

A 82.0 kg worker climbs a cell tower which is 72.0 m tall. The worker brings 208 kg of tools and equipment to the top off the tower. The tower can be modeled as equivalent to a steel cylinder that has a cross sectional area of .022 m^2. By how much did the tower compress when the worker was at the top of the tower. Young's modulus for steel is 20.0 x 10^10 Pa.

A. .0465 mm

B. .0242 mm

C. .0345 mm

D. .0121 mm

In an experiment electrons are released with a kinetic energy of 2.8 eV. The amazing physicists doing the experiments are increasing the wavelength by 50%. Do you remember what happens? Are the photoelectrons faster or slower? The energy now is 0.44 eV.

A) Based on that information, what is the material of the cathode? (calculate the work function and compare to table 28.1 in our textbook).

B) What is the initial wavelength of the light?

C) When you go a few pages back in the textbook you can find out the temperature of a physical object radiating at that wavelength

Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to report the mass truthfully).

(a) What is the force constant (in N/m) of the spring in such a scale if it stretches 7.90 cm for a 11.0 kg load?

  13645.56 N/m

(b) What is the mass (in kg) of a fish that stretches the spring 5.50 cm?

7,66 kg

(c) How far apart (in mm) are the half-kilogram marks on the scale?

  3.6E-3 mm

Part A and C are wrong and I want details.