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qaws [65]
3 years ago
13

Jenna is learning how to ice skate. She wants her mother to pull her along so that she has an acceleration of 0.76 m/s2. If Jenn

a’s mass is 32.0 kg, with what force does her mother need to pull her? (Neglect any resistance between the ice and Jenna’s skates.)
Physics
1 answer:
Mademuasel [1]3 years ago
8 0
So you can use the equation force = mass x acceleration so if the equation is 0.76 and her mass is 32 you do 32 x 0.76 which is 24.32 N hope this helps :)
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Law Incorporation [45]

1. 0.16 N

The weight of a man on the surface of asteroid is equal to the gravitational force exerted on the man:

F=G\frac{Mm}{r^2}

where

G is the gravitational constant

M=8.7\cdot 10^{13}kg is the mass of the asteroid

m = 100 kg is the mass of the man

r = 2.0 km = 2000 m is the distance of the man from the centre of the asteroid

Substituting, we find

F=(6.67\cdot 10^{-11}m^3 kg^{-1} s^{-2})\frac{(8.7\cdot 10^{13} kg)(110 kg)}{(2000 m)^2}=0.16 N

2. 1.7 m/s

In order to stay in orbit just above the surface of the asteroid (so, at a distance r=2000 m from its centre), the gravitational force must be equal to the centripetal force

m\frac{v^2}{r}=G\frac{Mm}{r^2}

where v is the minimum speed required to stay in orbit.

Re-arranging the equation and solving for v, we find:

v=\sqrt{\frac{GM}{r}}=\sqrt{\frac{(6.67\cdot 10^{-11} m^3 kg^{-1} s^{-2})(8.7\cdot 10^{13} kg)}{2000 m}}=1.7 m/s

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3 years ago
7. Nancy has a mass of 60 kg and sits on the very end of a 3.00 m long plank pivoted in the middle. How much torque must her co-
netineya [11]

Answer:

Torque = 882Nm

Explanation:

Torque = Mg×distance

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Mass of Nancy=60jg

Acceleration due to gravity, g=9.8m/s^2

Torque= 60×9.8×1.5

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How much would it cost to cover the entire land area of the U.S. in dollar bills?
agasfer [191]

Answer:

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Explanation:

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  1200 miles × 3000 miles = 3.6×10^6 square miles.

The size of a dollar bill is about ...

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One mile is 160,934.4 cm, so 1 square mile is about ...

  1 mi^2 = (160,934.4 cm)^2 ≈ 2.59·10^10 cm^2

The number of dollars of interest is then ...

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It would cost about 900 trillion dollars to cover the land area of the US in $1 bills.

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