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4 years ago

Dark matter may explain _____.

Physics

2 answers:

tia_tia [17]4 years ago

5 0

Answer: A.unexpected orbital velocities of stars in galaxies

Explanation:

Dark Matter makes up about 80% of matter in the universe. This matter does not emit light and hence, it is called dark matter as it cannot be observed directly.

The effect of the presence of the dark matter is unexpected orbital velocities of stars in galaxies. At the center, the orbital velocities are greater than those at the edge. Had there been no dark matter, the galaxy would have flown apart.

Lisa [10]4 years ago

4 0

Dark matter may explain unexpected orbital velocities of stars in galaxies.

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A charge Q is transferred from an initially uncharged plastic ball to an identical ball 17 cm away. The force of attraction is t

Alecsey [184]

Answer:

2.92 x 10¹² electrons

Explanation:

given,

distance between two plastic ball, r = 17 cm

r = 0.17 m

Force of attraction = F = 68 mN

F = 0.068 N

number of electron transferred from one ball to another.

using Coulomb Force equation

$F = \dfrac{kq^2}{r^2}$

$0.068 = \dfrac{9\times 10^9\times q^2}{0.17^2}$

q² = 2.1835 x 10⁻¹³

q = 4.67 x 10⁻⁷ C

now, number of electron

$N = \dfrac{q}{e}$

e is the charge of electron which is equal to 1.6 x 10⁻¹⁹ C

$N = \dfrac{4.67\times 10^{-7}}{1.6\times 10^{-19}}$

N = 2.92 x 10¹² electrons

electrons were transferred from one ball to the other is 2.92 x 10¹²

5 0

4 years ago

JOSEPH JOGS FROM END A TO OTHER END B OF A straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back

zzz [600]

(a) The average speed from A to B would be 1.76 metre per second and the average velocity from A to B would also be 1.76 metre per second

(b) The average speed from A to C would be 1.73 metre per second and the average velocity from A to C would be 0.87 metre per second

3 0

3 years ago

What should a sailboat operator do when approaching a PWC head-on

nekit [7.7K]

In accordance with the International Regulation for the prevention of collisions at sea:

1.- A sailing boat has a passing preference over a motorized boat, except when the motor boat is limited by its draft.

2.- The sailboat must maintain its course and speed.

3.- If it is evident that the PWC does not respond, the sailboat must sound the warning signal, and change its course to starboard.

4.- All actions must be taken as soon as possible.

5.- If a sailboat is using its engine, the situation changes, and in that case, both ships must alter to starboard.

8 0

3 years ago

11. Find the direction of the Force

d1i1m1o1n [39]

Answer:

We answer that before but I forgot

7 0

3 years ago

Ron bicycles forward with an acceleration of 2.1 m/s2. If he is applying a forward force

Mila [183]

Answer:

195

Explanation:

he can only apply as much force as his body mass so it would be 195

3 0

3 years ago