1,314 Answered Questions for the topic physical science

Physical Science Physics Trigonometry Math Help

04/21/16

how to answer using snell's law
Need to know how to solve and how you got an answer. A beam of light moves from an optical fiber (n=1.44) to air. If the beam of light entered at an angle of 12 degrees, what is the angle of... more
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Physical Science Physics Trigonometry Math Help

04/21/16

How to find using snell's law
Need to know how to solve and how you got an answer. A beam of light moves from air to an optical fiber (n=1.44). If the beam of light entered at a 23 degree angle, what is the angle of refraction... more
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Physical Science

04/19/16

when you run around a track at 5km/h your velocity is constant
i need to make a game for my class in 8th grade i need to know if this is a true or false   
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Physical Science

04/13/16

Exoplanets are planets that orbit stars other than our sun
is it true of false
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Physical Science

03/30/16

how can Ethan BEST describe his conclusion
Ethan is observing chemical and physical properties of a substance he heats a substance and observes that the substance turn from a brown solid to a black powder he refers to several chemistry... more
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Physical Science

03/27/16

Which compound is composed of oppositely charged ions? Please help me!
\l "\l " A. SCl2 \l "\l " B. NH3 \l "\l " C. OCl2 \l "\l " D. Na2O
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Physical Science

03/10/16

objects fall toward earth at the rate of 9.8 m/s2 because of centripetal force
this is about forces and newtons laws
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Physical Science

03/07/16

LeBron can run down the court 9 m/s. How Long does it take him to run the full length of the 27m court
I need help
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Physical Science

03/02/16

IF A CAR TRAVELS 300. METERS WEST IN 12.0 SECONDS WHAT IS THE AVERAGE SPEED OF THE CAR?
IF A CAR TRAVELS 300. METERS WEST IN 12.0 SECONDS WHAT IS THE AVERAGE SPEED OF THE CAR?
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Physical Science Physics

02/26/16

Physics Question
How many moles of caffeine are there in 312.0g of caffeine?
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Physical Science Physics

02/21/16

physical science
Isotoes of an element have the same number of___.   a. neutrons but different numbers of protons   b. protons but different numbers of neutrons   c. neutrons and electrons   d. protons and... more
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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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