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3 years ago

Which statement is true concerning the evidence for black holes?

1 answer:

5 0

Scientists can see the effect of black holes on nearby stars is true <span>concerning the evidence for black holes.</span>

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A rock is thrown straight upward off the edge of a balcony that is 5 m above the ground. The rock rises 10 m, then falls all the

Dvinal [7]

Displacement = distance and direction from the start-point
to the end-point, regardless of the route followed on the way.

From the throw to the 'plop', the displacement is 5 meters down.

7 0

3 years ago

If the momentum of a system is to be conserved, which must be true of the net external force acting on the system?

kari74 [83]

Answer:

D. zero

Explanation:

For momentum of an isolated or closed system to be conserved (initial momentum must equal final momentum), the net external force acting on the system must be zero.

There is always external forces acting on a system, for this system’s momentum to remain constant, all the external forces acting on the system must cancel out, so that the net external force on the system is zero.

$F_{ext} = 0$

Therefore, the correct option is "D"

D. zero

7 0

3 years ago

How much time would Simpson save by increasing his average velocity to 26m/s East?

igor_vitrenko [27]

Answer:

8 minutes

Explanation:

Part of the question is missing. Complete question is:

<em>Simpson drives his car 144 km with an average velocity of 24 m/s toward the east. How much time would Simpson save by increasing his average velocity to 26m/s East?</em>

Solution:

First of all, we have to calculate the time it takes for Simpson to complete the drive moving at the initial velocity, 24 m/s. We can use the formula:

$t=\frac{d}{v}$

where

$d=144 km = 1.44\cdot 10^5 m$ is the displacement

$v=24 m/s$ is the velocity

Substituting,

$t=\frac{1.44\cdot 10^5}{24}=6000 s = 100 min$

While driving at 26 m/s, the time taken will be

$t=\frac{1.44\cdot 10^5}{26}=5538 s=92 min$

So, Simpson will save 8 minutes.

7 0

3 years ago

Which measurement is equivalent to 350 milliliters?

tensa zangetsu [6.8K]

350 milliliters equals to .35 liters
Therefore, 3.5 times 10^-1 would be the only correct answer since that is the only one that matches .35 liters

4 0

3 years ago

Which of the following describes density only in terms of metric units?

Alborosie

A) Kilograms per cubic meter. Every other option either contains pounds or feet, which are both units of measurement from the standard system, not the metric system.

7 0

3 years ago