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Sphinxa [80]
3 years ago
8

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 × 1

0 24 kg and radius of the earth is 6.4 × 10 6 m.)
Physics
1 answer:
Free_Kalibri [48]3 years ago
7 0

Answer:

Explanation:

just use the gravational force equation which is G x m of earth x m of object divided by r squared (which is radius of earth)

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An asteroid is discovered in a nearly circular orbit around the Sun, with an orbital radius that is 3.570 times Earth's. What is
inysia [295]

Explanation:

Given:

r_a = 3.570R_E

R_E = 1.499×10^{11}\:\text{m}

M_S = 1.989×10^{30}\:\text{kg}

G = 6.674×10^{-11}\:\text{N-m}^2\text{/kg}^2

Let m_s= mass of the asteroid and r_a = orbital radius of the asteroid around the sun. The centripetal force F_c is equal to the gravitational force F_G:

F_c = F_G \Rightarrow m_a\dfrac{v_a^2}{r_a} = G\dfrac{m_aM_S}{r_a^2}

or

\dfrac{4\pi^2 r_a}{T^2} = G\dfrac{M_S}{r_a^2}

where

v = \dfrac{2\pi r_a}{T}

with T = period of orbit. Rearranging the variables, we get

T^2 = \dfrac{4\pi^2 r_a^3}{GM_S}

Taking the square root,

T = 2\pi \sqrt{\dfrac{r_a^3}{GM_S}}

\:\:\:\:=2\pi \sqrt{\dfrac{(3.57(1.499×10^{11}\:\text{m}))^3}{(6.674×10^{-11}\:\text{N-m}^2\text{/kg}^2)(1.989×10^{30}\:\text{kg})}}

\:\:\:\:= 2.13×10^8\:\text{s} = 6.75\:\text{years}

3 0
3 years ago
assuming that the seafloor is spreading at a rate of 1.3cm/yr, calculate how long it took africa's west coast to move 2400 kn aw
Verdich [7]

Answer: 184,615,384.6 years

Explanation:

This problem can be solve by the following equation:

V=\frac{d}{t} (1)

Where:

V=1.3 \frac{cm}{year} \frac{1 km}{100000 cm}=0.000013 \frac{km}{year} is the spreading rate of the seafloor, its velocity

d=2400 km is the distance the Africa's west coast moved at this rate

t is the time it took to the coast to move the descibed distance

Isolating t from (1):

t=\frac{d}{V} (2)

t=\frac{2400 km}{0.000013 \frac{km}{year}} (3)

Finally:

t=184,615,384.6 years This is the time it took to the Africa's west coastto  move away from the Mid atlantic ridge.

3 0
2 years ago
ou are to drive to an interview in another town, at a distance of 300 km on an expressway. The interview is at 11:15 a.m. You pl
Shkiper50 [21]

Answer:

133.62 kmh.

Explanation:

Time provided = 3.25 hours.

Distance to be covered 300 km

Times spent in first  100 km = 1 hour

Time spent in next 43 km

= 43 / 40 = 1.075 hours

Total time spent = 2.075 hours

Total distance covered = 143 km

Distance remaining = 300 - 143

=157 km .

Time remaining = 3.25 - 2.075

= 1.175

Speed required = Distance remaining / time remaining

= 157 / 1.175

= 133.62 kmh.

8 0
3 years ago
A negative slope on the velocity vs. time graph indicates that the object is not accelerating​
liubo4ka [24]

AnswerNo

However, the acceleration is the opposite of the movement:

Explanation:

8 0
3 years ago
The density of air is 1.3 kg/m^3. What mass of air is contained in a room measuring 2.5m x 4m x 10m? Give your answer in kg. Bra
krek1111 [17]
Mass= density x volume
1.3 kg/m^3 x ( 2.5x4x10) m^3
= 130 kg
7 0
3 years ago
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