Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 42

**physics**

A device is designed to measure the speed of a bullet. The device consists of two rotating disks, separated by a distance of d=0.850m, and rotating with an angular speed of 95.0 rad/s. The bullet first passes through the left disk and the through the right disk. It is found th...

**American History**

Explain how each of the following government policies encouraged business development: railroad subsidies; tariffs. I don't really know about how railroad subsidies encouraged business development. For tariffs, I got this: tariffs were necessary to protect domestic industr...

**physics**

A water slide is constructed so that swimmers, starting from rest at the top of the slide leave the end of the slide traveling horizontally. There is still a height between the surface of the water and the end of the slide. One person hits the water 5.00m far from the end of t...

**physics**

At the end of the semester, you are loading your gear into a van to go home. In loading the van, you can either lift a 45.0-kg crate straight up(method 1) or push it up a 3.00-m-long ramp that is inclined at an angle above the horizontal (method 2).In both methods, the crate ...

**physics**

i don't understand...this part: the potential energy change was 2646 sin A - 485 This equals the potential energy change with method 1, or 1323 sin A. Therefore 2646 sin A -485 = 1323 sin A 485 = 1323 sin A can you please explain it in details£¿

**physics**

At the end of the semester, you are loading your gear into a van to go home. In loading the van, you can either lift a 45.0-kg crate straight up(method 1) or push it up a 3.00-m-long ramp that is inclined at an angle above the horizontal (method 2).In both methods, the crate i...

**physics**

A bicyclist rides 5.0km due east, while the resistive force from the air has a magnitude of 3.0N and points due west. The rider then turns around and rides 5.0km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of 3.0N a...

**physics**

A 1200-kg car is being driven up a 5.0degrees hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f=524N. A force F is applied to the car by the road and propelsthe car forward. In addition to these two forces, two other forces act o...

**American History**

Many historians have claimed that geography has been very generous to the United States. How does the climate be generous to the United States?

**physics**

A satellite has a mass of 5850kg and is in a circular orbit 4.1*10^5m above the surface of a planet. The period of the orbit is two hours. the radius of the planet is 4.15*10^6m.What is the true weight of the satellite when it is at rest on the planet's surface? can anyone...

**physics**

A crate is resting on the bed of a moving truck. the coefficient of static friction between the crate and the truck bed is 0.40. the driver hits the brakes. assuming the truck is traveling on level ground, determine the maximum deceleration that the truck can have without the ...

**questions**

so what do you mean by 0.1g?

**physics**

a skater with an initial speed of 7.60m/s is gliding across the ice. air resistance is negligible. (a)the coefficient of kinetic friction between the ice and the skate blades is 0.100. find the deceleration caused by kinetic friction. (b)how far will the skater travel before c...

**i dont understand**

i don't understand how you get this part..a = F/M = 0.1 g = 0.98 m/s^2

**physics**

a skater with an initial speed of 7.60m/s is gliding across the ice. air resistance is negligible. (a)the coefficient of kinetic friction between the ice and the skate blades is 0.100. find the deceleration caused by kinetic friction. (b)how far will the skater travel before c...

**math**

what is "ln x/ln 2"???????

**math**

given: f(x)=x^2 g(x)=2^x find: g^-1(f(3))to the nearest tenth can any one please explain to me how to find the inverse of g of f of 3????

**math**

can anyone please explain to me how come x=pi can't not represent a function?

**physics**

an airplane has a mass of 3.1*10^4kg and takes off under the influence of a constant net force of 3.7*10^4N. what is the net force that acts on the plane's 78-kg pilot? can anyone give me some hints to do this?THX A LOT!

**physics**

a coast guard ship is traveling at a constant velocity of 4.20m/s, due east, relative to the water. on his radar screen the navigator detects an object that is moving at a constant velocity. the object is located at a distance of 2310m with respect to the ship, in a direction ...

**American History**

why do the poor whites still want to own slaves if the slaves rebelled and killed their slaveholders?

**American History**

How would a poor white react to the Nat Turner rebellion???

**business**

Why do you think some investors choose to buy index options?

**physics**

The earth moves around the sun in a nearly circular orbit of radius 1.50*10^11m. During the three summer months (an elapsed time of 7.89*10^6s), the earth moves one-fourth of the distance around the sun. (a)what is the average speed of the earth? (b) what is the magnitude of t...

**physics**

how do you know 16m,9m, and E forms a right triangle?

**physics**

In a mall, a shopper rides up an escalator between floors. at the top of the escalator, the shopper turns right and walks 9.00m to store. the magnitude of the shopper's displacement from the bottom of the escalator is 16.0m. the vertical distance between the floors is 6.00...

**business**

Sergio bought 250 shares of Silicon Acme @ 20 through his margin account. Then the stock plummets to $7.50 a share. Calculate the market value, debit balance, and customer equity if his brokerage firm's margin rate is set 60%. I got... market value = $1875 debit balance = ...

**American History**

why are the presidential cabinet and political parties called part of the unwritten constitution?

**American History**

Elastic Clause: To make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this Constitution in the government of the United States, or in any department or officer thereof. Why is the "elastic cla...

**American History**

Why does it take more states to ratify an amendment than to propose one?

**physics**

A spelunker drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.50s after the stone is dropped. How deep is the hole? how can i use the speed of sound to solve this problem?Please give me some hin...

**physics**

i still don't get where did you get the 16...

**physics**

where did you get the 16? The final answer should equal to 1.7s.

**physics**

A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fail halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the way to the ground. Can anyone give me some hints to do this? Than...

**english**

what is a widow's walk? I am trying to explain this metaphor's meaning in the book, but I don't understand this term. Can any one help please???? THX A LOT!!!

**math**

I did mutiply the second term by (x-3)/(x-3), but when I simplify it, I got mess up.

**math**

[(x-9)/(x^2-9)]-[(1)/(x+3)] I got (6-x)/(x+3) for answer. [(2)/(y-3)]+[£¨4£©/(3-y)] I got (-2)/(y-3) for answer. I'm not sure about the answers, please check them for me and correct me! THANKS A LOT!

**math**

[(x-9)/(x^2-9)]-[(1)/(x+3)] I got (6-x)/(x+3) for answer. [(2)/(y-3)]+[£¨4£©/(3-y)] I got (-2)/(y-3) for answer. I'm not sure about the answers, please check them for me and correct me! THANKS A LOT!

**physics**

Following your thinking, I first got Vo=4.02 m/s = the speed at the top of the window then I use the equation:Vf=Vo+gt, so I got Vf=5.981m/s= the speed at the bottom of the window and then I use the equation: Vf^2-Vo^2=2gd, thus I got d=1.82m = the distance from the roof to th...

**physics**

A stone is observed falling past a small window 1 meter tall in 0.2 seconds. how fast is it moving as it passes the bottom of the window?how far is the bottom of the window from the roof, where the stone originally began its fall from rest?what is the stone's average speed...

**physics**

a tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0m/s. the car is a distance d away the bear is 26m behind the tourist and running at 6.0m/s. the tourist reaches the car safely what is the maximum possible value for d? i got ...

**physics**

A force vector F1 points due east and has a magnitude of 200 newtons. A second force F2 is added to F1. The resultant of the two vectors has a magnitude of 400 newtons and points along the east/west line. Find the magnitude and direction of F2. Note that there are two answers....

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