1,302 Answered Questions for the topic physical science

Physical Science Physics

02/21/16

physical science
A specific radioactive isotope as a half-life of 33.2 minutes. How long will it take this isotope to decay to 1/8 of its original amount?
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Physical Science Physics

02/21/16

physical science
Two short-lived isotopes of an element are produced in a nuclear reaction. One of these isotopes has a mass of 5.3731 amu and accounts for 75.5% of the production. The remaining other isotope has a... more
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Physical Science

02/18/16

Please please help me out w/ this question?
what happens when refraction of light passes from glass into water
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Physical Science

02/15/16

Please, i need your help!!!!!!!! I would be so thankful if somebody helped me w/ this!
  The picture shows a battery that is 9 V, a light bulb that is 9 Ω, Point P is a little bit below the light bulb, and a motor 9 Ω   *How much current is in the circuit when these things are... more
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02/13/16

How far up the ramp (in the direction along the ramp) does the block go before it comes to a stop?
A 4.25-kg block is sent up a ramp inclined at an angle θ = 31.5° from the horizontal. It is given an initial velocity v0 = 15.0 m/s up the ramp. Between the block and the ramp, the coefficient of... more
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Physical Science

02/13/16

What's the answer? help?
If the output work of a simple machine is ________ than the input work, the machine is said to have less than 100% efficiency.
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Physical Science

02/13/16

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A bundle of roofing shingles slides off a roof and is falling to the ground. As it falls, what kind of energy does it possess? \l "\l " A. Kinetic and potential \l "\l " B. Potential only \l "\l "... more
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Physical Science

02/13/16

HELP ME PLEASE!
Felix expends 100 W of power to climb 10 meters in 20 seconds. How much force does he exert? \l "\l " A. 400 N \l "\l " B. 20 N \l "\l " C. 200 N \l "\l " D. 10 N
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Physical Science

02/13/16

Which one would it be?
Which number is written using standard scientific notation?                         
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Physical Science Science Science Fair Project

02/12/16

Science Question
A local FM radio station broadcasts a frequency of 97.0 MHz. What is the wavelength, in meters, of the electromagnetic waves produced?  
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Physical Science

02/07/16

How do i solve this? please help me.
You expend 1000 W of power in moving a piano 10 meters in 5 seconds. How much force do you exert? A. 50,000 N B. 50 N C. 500 N D. 250 N
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Physical Science

02/07/16

HELP NEEDED!!!!!!
In an isolated system, two cars, each with a mass of 2,000 kg, collide. Car 1 is initially at rest, while Car 2 was moving at 20 m/s. What is their combined momentum after the collision? A. 0... more
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Physical Science

02/07/16

HELP!!!!!!
In an isolated system two cars each with a mass of 1000 kg collide Car 1 is initially at rest while Car 2 was moving at 10 ms. they move off together. what is their speed?
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Physical Science Science

02/07/16

physical science
Condensation is a ____ process.   heating   convection   cooling   evaporation
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Physical Science Science

02/07/16

science question
One side of an asteroid is constantly illuminated by the sun while the other side remains in the dark. If the two sides are at different temperatures, how might heat transfer from one side to the... more
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Physical Science Science

02/07/16

Science question
Determine the number of calories needed to change 27g of water at 25C into steam at 100C(degrees celsius).
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Physical Science Science

02/07/16

Science Question
You need to add ___ J of heat to raise the temperature of 100 grams water by 14 defrees celsius.  
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Physical Science

02/07/16

PLEASE HELP ME WITH THIS
As you sit in front of a computer, which of the following is exerting the least gravitational force of attraction on you? A. Your chair B. Your classmate across the room that you've had your eye... more
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Physical Science

02/06/16

How do i do this? help please!?
Two soccer players kick the same 1-kg ball at the same time in opposite directions. One kicks with a force of 20 N; the other kicks with a force of 12 N. What is the resulting acceleration of the... more
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Physical Science

02/06/16

d=vt+1/2at^2 solve for t
d=vt+1/2at^2 solve for t Have to rearrange the formula to find t. Show all the steps.
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Physical Science

02/05/16

if sarah swims at an average speed of 8 meters per second. how far will she go in 25 seconds?
i really need to learn how to sovle these kind of problems.  
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Physical Science

02/01/16

Throw ten coins onto a flat surface. Move aside all the coins that landed tails-up. Collect the remaining coins. After tossing them once again, remove all coins
Throw ten coins onto a flat surface. Move aside all the coins that landed tails-up. Collect the remaining coins. After tossing them once again, remove all coins landing tails-up. Repeat this... more
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Physical Science Science

01/30/16

Science Questio.
The total energy of a 3.0kg falling rock is 5000J. If its potential energy is 1,985J, the kinetic energy of the rock is___J.
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Physical Science Science

01/30/16

Science Questions
If the distance from the Sun varied during an asteroid's orbit, would its kinetic energy change? Would its potential energy change? Would the total energy (sum of kinetic and potential energy) of... more
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Physical Science

01/25/16

Will the honey packet take in water? Why or why not? If so, what's that process called?
There's an experiment I'm doing called the magic ketchup experiment. I would like to know what process would allow water to get inside the packet. Me and my dad are doing this experiment and he... more
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