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3 years ago

Which of the following is a force acting between objects that do not touch?

Physics

2 answers:

scoundrel [369]3 years ago

5 0

Answer:

the answer is

C.Electrical force

hope this helps u stay safe

Explanation:

kirill [66]3 years ago

3 0

The answer is B friction force

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How much Power is needed to lift a 200 N block

vova2212 [387]

Answer:

10 W

Explanation:

P = F x v

F = 200N

v = x2 - x1 / t

= 6 - 3 / 60

= 3 / 60

= 1 / 20

= 0.05 m/s

P = 200 x 1/20

= 10 W

4 0

2 years ago

The first artificial satellite to orbit the Earth was Sputnik I, launched October 4, 1957. The mass of Sputnik I was 83.5 kg, an

9966 [12]

Answer:

$-4.941*10^8J.$

Explanation:

To solve this exercise it is necessary to take into account the concepts related to gravitational potential energy, as well as the concept of perigee and apogee of a celestial body.

By conservation of energy we know that,

$\Delta U = \Delta_{perogee}-\Delta_{Apogee}$

Where,

$U= \frac{-GmM_e}{r}$

Replacing

$\Delta U = \frac{-GmM_e}{r_p}- \frac{-GmM_e}{r_a}$

$\Delta U = GmM_e (\frac{1}{r_A}-\frac{1}{r_p})$

Our values are given by,

$m = 85.5Kg$

$M_e = 5.97*10^{24}Kg$

$r_A = 7330Km$

$r_p = 6610Km$

$G = 6.67*10^{-11}Nm^2/Kg^2$

Replacing at the equation,

$\Delta U = (6.67*10^{-11})(85.5)(5.97*10^{24}) (\frac{1}{7330}-\frac{1}{6610})$

$\Delta U = -4.941*10^8J$

Therefore the Energy necessary for Sputnik I as it moved from apogee to perigee was $-4.941*10^8J.$

4 0

3 years ago

Match the following ERA’s Question 4

inna [77]

1. Cenozoic ERA
2. Mesozoic ERA
3. Paleozoic ERA

8 0

3 years ago

PLEASE HURRY!!!!<br>why does the temperature change?

svet-max [94.6K]

Wind, radiation, and the sun are all factors that change the temperature.

Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces.

6 0

3 years ago

a car drives at 88 km/h over a distance of 22 kilometers calculate in minutes the time taken for the audi to travel this distanc

Natali5045456 [20]

V=88 km/h d=22km t=? if d/t=V t=d/V t=22km/88km/h

t=0,25h

t=1500min

i hope this helps

7 0

3 years ago