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jeka57 [31]
3 years ago
7

A 570 kg elevator accelerates downwards at 1.5 m/s2 for the first 13 m of its motion.

Physics
1 answer:
jeka943 years ago
6 0
  • Mass of the elevator (m) = 570 Kg
  • Acceleration = 1.5 m/s^2
  • Distance (s) = 13 m
  • Let the force be F.
  • We know, F = ma,
  • Therefore, F = (570 × 1.5) N = 855 N
  • Angle between distance and force (θ) = 0°
  • We know, work done = F s Cos θ
  • Therefore, work done by the cable during this part
  • = (855 × 13 × Cos 0°) J
  • = (855 × 13 × 1) J
  • = 11115 J

<u>Answer</u><u>:</u>

<u>1</u><u>1</u><u>1</u><u>1</u><u>5</u><u> </u><u>J</u>

Hope you could get an idea from here.

Doubt clarification - use comment section.

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The asker of the second question needs a tutorial in radiometric dating. There is little likelihood that the daughter isotope has the same atomic weight as the parent isotope. To measure the mass isotopes doesn't tell us how many atoms of each exist. To get around that let's pretend — which will likely serve the purpose ineptly intended — that the values give an the particle ratio, 125:875. 

<span>The original parent isotope count was 125 + 875 = 1000. The remaining parent isotope is 125/1000 or 1/8. 1/8 = (1/2)^h, where h is the number of half-lives. </span>

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3 years ago
⦁ What is the mass of air in a room that has dimensions of 10m x 20m x 4 m? Use values from the book to show your work.
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The mass of an air can be derived from the equation from density, where D=m/v. Multiply each sides by v making the equation m= Dv. Substituting the values for density and volume. m = (1.225 kg/m3)(10x20x4)m3 gives a result of 980 kg.
8 0
4 years ago
Jon recently drove to visit his parents who live 648 miles away. On his way there his average speed was 14 miles per hour faster
Vladimir79 [104]

Answer:

speed of the Jon visiting parents = 56 mph

           speed of the Jon when returning from home = 56 - 14 = 42 mph

Explanation:

given,

distance of Jon parent's house = 648 mile

avg speed when he was visiting his parent's house be 'x' mph

avg speed when he is returning from his parent's house be 'x-14' mph

total time taken = 27 hours

total distance = speed × time

648 = x × t₁

t_1 = \dfrac{648}{x}

648 = ( x - 14 ) × t₂

t_2 = \dfrac{648}{x-14}

t = t₁ + t₂

27 = \dfrac{648}{x} + \dfrac{648}{x-14}

1 = 24 (\dfrac{1}{x} + \dfrac{1}{x-14})

x² - 62 x + 336 = 0

x² - 56 x - 6 x + 336 = 0

(x - 56 )(x - 6)=0

on solving

x = 56 ,6

hence, speed of the Jon visiting parents = 56 mph

           speed of the Jon when returning from home = 56 - 14 = 42 mph

8 0
3 years ago
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What type of bond is formed when two or more water molecules interact?
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Answer:

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how does a particle differ from its anti-particle? it has opposite mass. it has opposite charge. its wave-function is the opposi
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The mass of an antiparticle is equal to that of the particle version, but it has the opposite charge. Antiparticles have opposite charges, baryon numbers, lepton numbers, and strangeness. A subatomic particle known as an antiparticle has the same mass as a particle of regular matter but the opposite electric charge and magnetic moment. Thus, the positron (a positively charged electron) is the opposite of the negatively charged electron.

To know more about electric charge,

brainly.com/question/11461182

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