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3 years ago

The purpose of the control group is to

Physics

2 answers:

pogonyaev3 years ago

5 0

Have everything in control and in order and discuss about different issues.

maxonik [38]3 years ago

4 0

A researcher must only measure one variable at a time, and using a scientific control group gives reliable baseline data to compare their results with. For example, a medical study will use two groups, giving one set of patients the real medicine and the other a placebo, in order to rule out the placebo effect.

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Intense physical activity that requires little oxygen but uses short bursts of energy is called Anaerobic exercise? True or fals

Ghella [55]

I believe that is true. Anaerobic means without (much) Oxygen. This usually builds up lactic acid in muscles.

8 0

3 years ago

The direction of the magnetic field produced by an electric current will change when the direction of the _ changes.

Scorpion4ik [409]

Answer: Electric current

Explanation :

The direction of the magnetic field produced by an electric current will change when the direction of the electric current changes.

For example :

If a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).

Let the field lines are in the clockwise direction and when the direction of current is reversed then the direction of the magnetic field is in anticlockwise direction.

8 0

2 years ago

Read 2 more answers

The altitude of a hang glider is increasing at a rate of 6.75 m/s. At the same time, the shadow of the glider moves along the gr

Rufina [12.5K]

Answer:

16.45 m/s

Explanation:

Let y be the vertical distance and x be the horizontal distance

We are given that

The altitude of hang glider increasing at the rate= $v_y=\frac{dy}{dt}==6.75m/s$

The shadow of the glider moves along the ground at speed= $v_x=\frac{dx}{dt}=15m/s$

We have to find the magnitude of glider's velocity.

We know that

Magnitude of velocity= $v=\sqrt{v^2_x+v^2_y}$

Substitute the values

$v=\sqrt{(15)^2+(6.75)^2}$

$v=\sqrt{225+45.5625}$

$v=16.45m/s$

Hence, the magnitude of glider's velocity=16.45 m/s

4 0

3 years ago

please help me and give an explanation

algol [13]

Answer:

write: I think that we can only see one side of the moon because the moon rotates and spins on its axis at the same rate that the Moon orbits the Earth.

hope this is wht ur looking for. :)

Explanation:

4 0

2 years ago

what is the voltage in mv across an 5.5 nm thick membrane if the electric field strength across it is 5.75 mv/m? you may assume

inn [45]

Answer:

V = 31.62 m V

Explanation:

Given,

Voltage across thick membrane = ?

Thickness of the membrane, d = 5.5 n m

Electric field = 5.75 M V/m

we know

$E = \dfrac{V}{d}$

V = E d

V = 5.75 x 10⁶ x 5.5 x 10⁻⁹

V = 31.62 x 10⁻³ V

V = 31.62 m V

Hence, The Voltage across the membrane is equal to 31.62 m V.

3 0

3 years ago