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Mazyrski [523]
4 years ago
8

Adults should also do muscle-strengthening activities that involve all major muscle groups, performed on _____ or more days per

week.
A 7
B 2
C 5
D 4
Physics
1 answer:
Novay_Z [31]4 years ago
8 0
The answer is B. 2 
Hope I helped!
Let me know if you need anything else! 
~ Zoe
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Due to human demand because of its importance to life, the Earth's most precious resource is 
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The answer is variant C because every living organism needs water to survive. A human can live without water only 6 days, after that period the most important organs start to shut down because of the lack of water.
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One difference between a fundamental niche and a realized niche is that ___
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A fundamental niche can be defined as the range of environmental conditions in which each of the species survives. The realized niche can be termed as the range of environmental conditions in which a species is really found.
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How is work affected when an object is lifted straight up instead of using a ramp? Work will increase.
kifflom [539]
Without friction, the amount of work only depends on the final height,
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If the ramp has no friction, then it has no effect on the total amount
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3 0
3 years ago
The current in the wires of a circuit is 60.0 milliAmps. If the voltage impressed across the ends of the circuit were halved (i.
Ksivusya [100]

Answer:

30 miliAmps

Explanation:

Step 1:

Obtaining an expression to solve the question. This is illustrated below:

From ohm's law,

V = IR

Were:

V is the voltage.

I is the current.

R is resistance.

From the question given, we were told that the resistance is constant. Therefore the above equation can be written as shown below:

V = IR

V/I = constant

V1/I1 = V2/I2

V1 is initial voltage.

V2 final voltage.

I1 is initial current.

I2 final current.

Step 2:

Data obtained from the question. This include the following:

Initial voltage (V1) = V

Initial current (I1) = 60 miliAmps

Final voltage (V2) = one-half of the original voltage = 1/2V = V/2

Final current (I2) =..?

Step 3:

Determination of the new current. This can be obtained as follow:

V1/I1 = V2/I2

V/60 = (V/2) / I2

Cross multiply to express in linear form

V x I2 = V/2 x 60

V x I2 = V x 30

Divide both side by V

I2 = (V x 30)/V

I2 = 30mA.

Therefore, the new current is 30miliAmps

5 0
4 years ago
6: A body throws a ball vertically up. It returns to the ground after 5 seconds. Find the velocity with which the ball is thrown
Elodia [21]

Answer:

Explanation:

Ball rises and falls in equal periods. Because it goes by same speeds and same route. Therefore t_{rise} = t_{fall} =2.5 s

In free fall and vertical throw movement: x= (1/2).a.t^{2}

Here, we can find the height of the ball

x= (1/2).5.(2.5^{2}) = 15.625 m

From the attaches V-t graphics, x=V.t/2

15.624=V.(2.5)/2

V=12.5 m/s

3 0
4 years ago
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