10/23/17

What is the speed
A 20-gram rubber bullet traveling at 150 m/s hits a stationary 8.5 kg concrete block. If the bullet bounces off of the block in the opposite direction at 100 m/s, what is the final speed of the... more
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10/23/17

If copper has a density of 8.96 g/cm3, what is the volume of 6,000 g of copper?
If copper has a density of 8.96 g/cm3, what is the volume of 6,000 g of copper?
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10/23/17

proof that x+y=2xy
Proof for the equation that x+y=2xy  using whatever method.
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10/23/17

how many moles of gold are in 8.2 x 10^-10 grams of gold? Answer in units of mol your answer must be within +- 1.0%
i really need the answer ASAP  
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10/23/17

A rocket word problem
A rocket is fired straight upward so that its distance in feet above the ground x seconds after firing is given by f(x)=-16x^2+400x. Remember you can find the maximum and minimum by finding the... more
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10/23/17

An object is dropped from the top of a building and it hits the ground after 4.5 seconds. How tall is the building ? m (Round to nearest whole meter). How
 its hard i need help  
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10/23/17

Write a beta decay equation for uranium-238
My question is about beta decay. I don't know how to do these types of problems.
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10/23/17

NASA launches a rocket
NASA launches a rocket at t=0seconds. Its height, in meters above sea-level, as a function of time is given by h(t)=-4.9t2+175t+101Assuming that the rocket will splash down into the ocean, at what... more
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10/23/17

Two blocks, each of mass m = 2.3 kg, are pushed along the horizontal surface of a table by a horizontal force P of magnitude 5.7 N, directed to the right, as
shown below. The blocks move together to the right at constant velocity. (a) Find the frictional force exerted on the lower block by the table. (b) Find the coefficient of kinetic friction between... more
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10/23/17

Can some one help me write a story with these words?
I've been given twenty-four words and only have one or two ideas on what to write. I would like to see what you guys have to say. It's only a short story for ages between 13-15. Here are the... more
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10/23/17

Suppose that while moving into an apartment you move a refrigerator into place by sliding it across the floor. The refrigerator weighs 1452 N and the
coefficient of static friction between the floor and the refrigerator is 0.40. What is the least force you could exert on the refrigerator to move it?
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10/23/17

lithium releases two electrons readily
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10/23/17

How do i find instantaneous velocity with just a table of (X,Y) coordinates
So I have a table, with the range being time at ten second intervals, and a bunch of positions as my domains.
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10/23/17

m decreased by 2 is ?
Write an expression for "m decreased by 2
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10/23/17

Find the equation of a line in point-slope form, that passes through the point (1, -2)
and is perpendicular to 4x-2y=3. Please state equation and work
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10/23/17

Projectile velocity as a function of angle
A batted baseball leaves the bat at an angle θ with the horizontal and an initial velocity of v0 = 100 feet per second. The ball is caught by an outfielder 300 feet from home plate. Find θ if the... more
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10/22/17

physics question
A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0029 s. If the ball has a mass of 55 g and... more
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10/22/17

how much heat must be absorbed by 367 grams of water to raise its temperature by 45.0 to 70.0c
how much heat must be absorbed by 367 grams of water to raise its temperature by 45.0 to 70.0c
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10/22/17

What is the phase change from a gas to a solid
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10/22/17

A driver in a car traveling at a speed of 17.8 m/s sees a cat 101 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exa
A driver in a car traveling at a speed of 17.8 m/s sees a cat 101 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 2 m before the cat?
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10/22/17

Child on a swing with ropes 10 m long. Swing is pulled back until the ropes make a 47º angle with the vertical and then it is released.
Air resistance is neglected. What is the speed of the child at the bottom of the arc of the swing when the ropes are vertical?   Thank you in advance.
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10/22/17

How do i find the displacement??
An automobile with an initial speed of 3.89 m/s accelerates uniformly at the rate of 3.55 m/s2. Find the displacement after 4.15 s.   (I already have my answer i just want to make sure i got it... more
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10/22/17

A typical pH value for rain or snow in the northeastern United States is about 4.0.
s this basic or acidic? What is the corresponding hydrogen concentration? How does this compare with the hydrogen concentration of pure water?Round your answers to two decimal places when... more
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10/22/17

Find the final speed (physics)
A car with an initial speed of 6.9 m/s accelerates at a uniform rate of 0.62 m/s2 for 3.4 s. Find the final speed.
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10/22/17

How far has the car moved during the braking period? (physics)
A driver of a car traveling at 14.3 m/s applies the brakes, causing a uniform acceleration of -2.6 m/s2 , and reaches a final speed of 8.4 m/s? How far has the car moved during the braking period?
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