PHYSICS HIGH SCHOOL

Megan wants to see if mice that are fed food A or B grow at a faster rate. She measures the mass of the mice on day 1, then divides them into two groups based on the type of food they will be given. She feeds each group the same amount of food at the same time each day. Does Megan have a control group in this experiment?

Answers

Answer 1
Answer:

Answer:

No

Explanation:

It is an example of experimental group. Experimental group is defined as the group in an experiment under which each variable is tested, however, one variable is tested at a time.

On the other hand, control group is defined as the group which does not receive treatment by the researchers.

The only difference between the both group is that, under experimental group independent variable is changed but under control group it is held constant.
Answer 2
Answer: No, there is no control group because each group is treated under test conditions.

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A piston above a liquid in a closed container has an area of 1m2. The piston carries a load of 350 kg. What will be the external pressure on the upper surface of the liquid?

Answers

Pressure is defined as the force exerted per unit of area. From the information given, the force exerted can be attributed to the mass of the load carried by the piston. This means that its weight is equivalent to the force it exerts.

Weight = mass(9.81) = 3433.5 Newtons
Area of piston = 1 m^2
Pressure = Force/Area = 3433.5/1 = 3433.5 N/m^2 or Pascals.

Answer:

3.43 kPa

Explanation:

What is the temperature 32 degrees Fahrenheit in degrees Celsius?a. 20 degrees Celsius
b. 0 degrees Celsius
c. 10 degrees Celsius
d. 10 degrees Celsius

Answers

Using    (F - 32)/9  =  C/5
Where F is Fahrenheit,  C = Celsius.

Let F = 32,    (32 - 32)/9  =  C/5
                           0/9      =    C/5
                            0  =  C/5,            therefore  C =  0*5 = 0

32°F =    0°C

Answer:so that means the answer 32°F =    0°C

Explanation:

Using    (F - 32)/9  =  C/5

Where F is Fahrenheit,  C = Celsius.

Let F = 32,    (32 - 32)/9  =  C/5

                          0/9      =    C/5

                           0  =  C/5,            therefore  C =  0*5 = 0

32°F =    0°C

Which planet has a storm called the Great Dark Spot swirling in its atmosphere?a. Saturn
b. Jupiter
c. Uranus
d. Neptune

Answers

The answer is Jupiter not neptune :)
im thinking D. Neptune..

A box is being pulled to the right on flat ground with a force of 112 N at an angle of 42° to the horizontal. What is the x-component of the force of tension?

Answers

The x-component is related with the Force through the trigonometric function cosine.

cos(42°) = x-component / F ⇒ x-component = Fcos(42°) = 112N*0.743 = 83.2 N

Assume it takes 7.00 minutes to fill a 30.0 gal gas tank. (a) Calculate the rate at which the tank is filled in gallons per second. (b) Determine the rate at which the tank is filled in cubic meters per second. (c) Determine the time interval, in hours, required to fill a 1.00 m^3 volume at the same rate. ( 1 US gal = 231 in.^3)

Answers

a)
R1 = 30/(7*60)
We are multiplying 7 with 60 because there are 60 seconds in 1 minute.
R1 = 30/420 = 0.0714 gallons/second

b) For this we need to express gallons to cubic meters.
1 gallon = 0.003785 m^3
R2 = 0.0714*0.003785 = 0.00027 m^3/s

c) V = R2*t    where V is volume of some tank.
which means that
t=V/R2    
t =  3698.8s   or 
t = 1.0274 hours

If frequency is kept constant, how are the velocity and wavelength of a wave related?

Answers

Answer;

Velocity and wavelength are directly proportional when frequency is kept constant.

Explanation;

  • Frequency of a wave is the number of complete oscillations made by a given wave in one second.
  • Wavelength on the other hand, is the distance between two successful crests or troughs in a transverse wave or two successful rarefactions or compressions in a longitudinal waves.
  • The speed of a wave is given by the product of the frequency of a wave and the wavelength.
  • Speed = Frequency × wavelength,
  • Therefore, if frequency is kept constant, then the speed of a wave is directly proportional to the wavelength, such that an increase in wavelength increases the speed of the wave and vice versa.
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