An unmarked police car traveling a constant 85 km/h is passed by a speeder traveling 139 km/h . Precisely 1.00 s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.40 m/s2 , how much time passes after the police car is passed by a speeder and before the police car overtakes the speeder (assumed moving at constant speed)?

11)Two books are stacked on a table and are at rest. Hitchhiker’s Guide to the Galaxy lies on top of War and Peace which sits on the table. War and Peace is much heavier than Hitchhiker’s Guide to the Galaxy. Draw a free body diagram for each book. >> 12)The author Tolstoy claims: “The weight of Hitchhiker’s Guide to the Galaxy is a force that acts on War and Peace.” Is this correct? Explain your answer. >> 13)The author Douglas Adams states that there is only one force acting on Hitchhiker’s Guide to the Galaxy and the only reason that it does not move is because War and Peace is in the way. Is this correct? Explain your answer.

The New York Wheel is the world's largest Ferris wheel. It's 183 meters in diameter and rotates once every 37.3 min.

1.Find the magnitude of the average velocity at the wheel's rim, over a 7.80-min interval.

2.Find the magnitude of the average acceleration at the wheel's rim, over a 7.80-min interval.

3.Find the magnitude of the wheel's instantaneous acceleration.

4.Determine the ratio of the difference between the magnitude of the wheel's instantaneous acceleration and the magnitude of the average acceleration to the magnitude of the average acceleration.

You are given a vector in the xy plane that has a magnitude of 89.0 units and a y component of -64.0 units.

A) Assuming the x component is known to be positive, specify the magnitude of the vector which, if you add it to the original one, would give a resultant vector that is 80.0 units long and points entirely in the −x direction.

B) Specify the direction of the vector.

The giant squid axon has a diameter of 100μm, a membrane thickness of 7.5nm, and a specific membrane capacity of 1μF/cm2. Draw a schematic of the axon, local charge distributions, and indicate the electric field vector across the membrane at rest. Calculate the magnitude of the electric field across the membrane.

Two systems are in oscillation: a simple pendulum swinging back and forth through a very small angle and a block oscillating on a spring. The block-spring system takes twice as much time as the pendulum to complete one oscillation. Which of the following changes could make the two systems oscillate with the same period?

A. Increasing the mass of the pendulum bob

B. Increasing the angle through which the pendulum swings by a small amount

C. Decreasing the mass of both the block and the pendulum bob

D. Shortening the pendulum

A rock is thrown off a cliff at an angle of 46° above the horizontal. The cliff is 120 m high. The initial speed of the rock is 21 m/s. (Assume the height of the thrower is negligible.)

(a)

How high above the edge of the cliff does the rock rise (in m)?

(b)

How far has it moved horizontally when it is at maximum altitude (in m)? m

(c)

How long after the release does it hit the ground (in s)?

(d)

What is the range of the rock (in m)?

(e)

What are the horizontal and vertical positions (in m) of the rock relative to the edge of the cliff at

t = 2.0 s,

t = 4.0 s,

and

t = 6.0 s?

(Assume the +x-direction is in the horizontal direction pointing away from the cliff, the +y-direction is up towards the sky, and x = y = 0 at the point from which the rock is thrown.)

mx(2.0 s)=

my(2.0 s)=

mx(4.0 s)=

my(4.0 s)=

mx(6.0 s)=

my(6.0 s)=

Two circular disks spaced 0.005 m (0.50 cm) apart form a parallel-plate capacitor. Transferring 1.10 ×10^9 electrons from one disk to the other causes the electric field strength to be 2.50 ×10^5N/C. What are the diameters of the disks? Express your answer with the appropriate units.

Compare and contrast the resistors and capacitors, separately combined, in a series and parallel settings.

Or

Describe house wiring and specify how parallel or series connections of bulbs and resistors affect the functions.

Please remember to always add references and provide substantial answers. Also, respond to one other post submitted by your peer - MORE RESPONSES ARE PREFERRED . This post needs to actually discuss the submitted work by your peer. In lieu of this, you can also respond to a post submitted by your professor. But, such a response too should be an actual discussion. An actual discussion is not merely stating, “Good job,” or other similar phrases. The references should not be from sources, such as Wikipedia, yahoo.com, answers.com, etc.

1. A 7.00 kg sled is initially at rest on a frictionless horizontal road. The sled is pulled a distance of 2.40 m by a force of 18.0 N applied to the sled at an angle of 24° to the horizontal. Find the change in the kinetic energy of the sled.

2. A 0.24-kg stone is thrown vertically upward with an initial velocity of 7.10m/s from a height 1.30 m above the ground. What is the potential energy of the stone at its maximum height relative to the ground?

Describe the process of combustion. How do flammable materials ignite?

Describe the three methods by which heat moves from one object or area to another.

Explain why it is important for an arson investigator to understand these concepts.

Think about the length of the record groove for every minute of music. Debate whether the record quality depends on the speed the record turns. Given the same size record, does a 33.33 rpm record have higher/lower/the same audio quality as a 45 rpm record?

Does a song on the outside of a 12 inch diameter record have the same/higher/lower audio quality as a song that plays closer to the center of the record?

After 500 years of drifting in space and a brief visit on board the flagship Draconia, Buck Rogers headed to the Federal Directorate of Earth in his spacecraft. His descent consisted of the following stages. Assume that each stage followed immediately after the preceding stage and that the acceleration during each stage was constant. Stage A: Friction with the atmosphere reduced the speed from 19,500 km/h to 1700 km/h in 4.0 min. Stage B: A parachute then opened to slow it down to 340 km/h in 100 s. Stage C: Retro rockets then fired to reduce its speed to zero over a distance of 75 m. (a) Calculate the spacecraft’s acceleration (m/s2 ) during each stage. (b) What total distance (km) did the spacecraft travel in each stage

What is the minimum pushing force required to move the block?

The block is moving and is still being pushed with the force found in part A. What is the magnitude of the friction force?

The block is moving and is still being pushed with the force found in part A. What is the magnitude of the acceleration of the block?

A vernier caliper consists of two scales, Main scale and a vernier scale. the vernier scale is made by dividing 19 main scale divisions into 20 parts. Least count of the main scale is 1mm. a) What is the least count of this vernier caliper. b) what is the uncertainty of this instrument. c) Describe zero errors associated with vernier calipers and reasons to occur zero errors.

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