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Rashid [163]
4 years ago
7

6. Downhill walking or walking down stairs causes _______ contractions of the leg muscles.

Physics
1 answer:
Trava [24]4 years ago
5 0
<span>Downhill walking or walking down stairs causes D. Eccentric contractions of the leg muscles.</span>
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A grapefruit has a weight on earth of 4.9 newtons. what is the grapefruit's mass?
abruzzese [7]
The force of gravity is the force with which massively large objects such as the earth attracts another object towards itself. All objects of the earth exert a gravity that is directed towards the center of the earth. Therefore, the force of gravity of the earth is equal to the mass of the object times acceleration due to gravity.  

F = ma
4.9N = m (9.8 m/s^2), note that N (newtons) = kg-m/s^2
<u>m = 0.5 kg</u>
<u>The mass of the object is 0.5kg.</u>
7 0
3 years ago
How much force does it take to bring a 1,050 N car from rest to a velocity of 42 m/s in 13 seconds?
frozen [14]

Answer:

F = 339.23 N

Explanation:

Weight of a car, W = 1050 N

Initial velocity, u = 0

Final velocity, v = 42 m/s

Time, t = 13 s

The weight of an object is given by :

W = mg

g is the acceleration due to gravity

m=\dfrac{W}{g}\\\\m=\dfrac{1050}{10}\\\\m=105\ kg

The force acting on car is :

F=ma\\\\F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{105\times (42-0)}{13}\\\\F=339.23\ N

So, the force acting on the car is 339.23 N.

5 0
3 years ago
Meteoric material dates the formation of the solar system at about_____ billion years.
Alja [10]

According to meteoric material, the solar system was formed around <u>4.6 billion years</u> ago.

<h3>What substance makes up a meteorite?</h3>
  • With just trace levels of sulphide and carbide minerals, they are primarily composed of iron-nickel metal.
  • Many asteroids melted during the radioactive element decay in the early solar system, and the iron they carried, being dense, sank to the centre to create a metallic core.
<h3>What is the term for meteorite metal?</h3>
  • Meteoric iron, also known as meteoritic iron, is a native metal and a protoplanetary-disk remnant from the early universe that is found in meteorites.
  • It is mostly composed of the metals iron and nickel, primarily in the crystalline phases kamacite and taenite.

learn more about meteorite here

brainly.com/question/7993266

#SPJ4

6 0
1 year ago
Which group of elements is not usually reactive with any other elements a.metals b. Plastics c.metaloids d. Noble gases
cupoosta [38]
B plastics

They are unnatural
6 0
3 years ago
Read 2 more answers
Water _____.
Mice21 [21]
Water expands when it freezes (that's why you should never put closed, fully filled water bottles in the freezer !)

6 0
3 years ago
Read 2 more answers
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