The force of gravity acting on a child's mass on earth is 490 newtons. Whats the child's mass?A. 206 kg
B. 800 kg
C. 50 kg
D. 4802 kg

Answers

Answer 1

Answer: Force of gravity on an object is the weight of the object and is given by mass times accerelation due to gravity. The accerelation due to gravity is the accerelation of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtns, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

Answer 2

Answer:

Answer:

C. 50 kg

Explanation:

Force of gravity on an object is the weight of the object and is given by mass times acceleration due to gravity. The acceleration due to gravity is the acceleration of an object in free fall and is given by 9.8m/s^2. Given that the force of gravity acting on a child's mass on earth is 490 newtons, i.e. F = mg which means that 490 newtons = 9.8 times mass. Therefore, mass of the child is 490 / 9.8 = 50 kg.

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Solar cells convert what type of energy into electrical energy and why? A. electromagnetic
B. nuclear
C. chemical
D. thermal

Answers

Solar cells convert electromagnetic energy into electrical energy.

Deep currents flow along the __________.halocline
ocean floor
ocean surface
thermocline

Answers

Your answer would be that deep currents flow along the ocean floor.

Final answer:

Deep ocean currents primarily flow along the ocean floor, driven by variations in water density. The halocline and thermocline are transitional layers in the ocean, but do not direct deep current flow.

Explanation:

Deep currents in the ocean predominantly flow along the ocean floor. These are also known as deep-ocean or abyssal currents. Unlike surface currents, which are mainly driven by wind, deep ocean currents are driven by variations in water density, which involves factors such as differences in temperature and salinity. The halocline and thermocline refer to transitional layers within the ocean where salinity and temperature change rapidly, respectively. However, they do not necessarily direct the flow of deep currents.

Learn more about Deep Ocean Currents here:

brainly.com/question/21654036

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Describes how a simple machine can make work easier?

Answers

simple machines such as ramps lessen the moment required to do work. if a triangle has a base of 5 and the height is 7, a ramp would make the hypotenuse of this triangle lessoning the total distance. using a²+b²=c² 25+49=c² 74≈8.6 and it is obvious that 8.6 is less than 12 in every unit. other simple machines such as pulleys make it lighter making it simply easier for an object to be lifted.

If we assume that 60 % of the kinetic energy delivered by a 1.80-kg hammer with a speed of 7.80 m/s is transformed into heat that flows into the nail and does not flow out, what is the temperature increase of an 8.00-g aluminum nail after it is struck ten times?

Answers

Answer:

45.6°C

Explanation:

Kinetic energy = $(1)/(2)mv^2$

Use m= 1.80kg and v=7.80m/s (mass and speed of hammer).

K = 0,5*1.80kg*(7.80m/s)^2 = K=54.8J

Heat is 60% of Kinetic energy. Q = 0.6*54.8J = 32.9J

As it is stuck 10 times the total heat is 10*32.9J = Total Heat = 329J

Use the equation $Q = mC_v \Delta T$ to find change of temperature:

$\Delta T = (Q)/(mC_v)$

Q = 329J; m = 8.00g of aluminium; C_v = 0.900J/g°C (For aluminium)

$\Delta T = (329J)/(8.00g*0.900J/g°C)$

Calculating gives Change of Temperature = 45.6°C

The inner planets are relatively small bodies composed mostly of rock and metals. Why did they develop this way instead of becoming gas giants like the outer planets?

Answers

The temperature of the early solar system explains why the inner planets are rocky and the outer ones are gaseous. As the gases coalesced to form a protosun, the temperature in the solar system rose. In the inner solar system temperatures were as high as 2000 K, while in the outer solar system it was as cool as 50 K. In the inner solar system, only substances with very high melting points would have remained solid. All the rest would have vaoprized. So the inner solar system objects are made of iron, silicon, magnesium, sulfer, aluminum, calcium and nickel. Many of these were present in compounds with oxygen. There were relatively few elements of any other kind in a solid state to form the inner planets. The inner planets are much smaller than the outer planets and because of this have relatively low gravity and were not able to attract large amounts of gas to their atmospheres. In the outer regions of the solar system where it was cooler, other elements like water and methane did not vaporize and were able to form the giant planets. These planets were more massive than the inner planets and were able to attract large amounts of hydrogen and helium, which is why they are composed mainly of hydrogen and helium, the most abundant elements in the solar system, and in the universe

https://lco.global/spacebook/planets-and-how-they-formed/

hope it helps

A force of 20 N is executed to raise a rock weighing 30 N. What is the actual mechanical advantage?