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Naddika [18.5K]

4 years ago

5

How do scientists look for black holes in the sky

2 answers:

elena55 [62]4 years ago

6 0

To find black holes in space, scientists use telescopes to study visible light, X-rays, and radio waves. When gas orbits a black hole, it gets very hot and starts emitting X-rays and radio waves. Through special telescopes, the area surrounding the black hole looks really bright.

pentagon [3]4 years ago

5 0

Scientists look through special telescopes and the area surrounding the black hole is suppose to look really bright.

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What instrument is used to expand burr holes?

k0ka [10]

Craniotomes are used

4 0

3 years ago

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole.

Fiesta28 [93]

Answer:

6.0 m/s

Explanation:

According to the law of conservation of energy, the total mechanical energy (potential, PE, + kinetic, KE) of the athlete must be conserved.

Therefore, we can write:

$KE_i+PE_i =KE_f+PE_f$

or

$\frac{1}{2}mu^2+0=\frac{1}{2}mv^2+mgh$

where:

m is the mass of the athlete

u is the initial speed of the athlete (at the bottom)

0 is the initial potential energy of the athlete (at the bottom)

v = 0.80 m/s is the final speed of the athlete (at the top)

$g=9.8 m/s^2$ is the acceleration due to gravity

h = 1.80 m is the final height of the athlete (at the top)

Solving the equation for u, we find the initial speed at which the athlete must jump:

$u=\sqrt{v^2+2gh}=\sqrt{0.80^2+2(9.8)(1.80)}=6.0 m/s$

4 0

3 years ago

An engine takes in 2400 J of heat, and rejects 1880 J of heat into the air. What is the efficiency of the engine? (No Unit)

Galina-37 [17]

Answer:

.2166 repeating or 21.66% repeating

Explanation:

In attached image

8 0

3 years ago

Earth surface are composed of 70% of water and 30% of lands or soil.

musickatia [10]

Answer:

idk

Explanation:

7 0

4 years ago

If you dive underwater, you notice an uncomfortable pressure on your eardrums due to the increased pressure. The human eardrum h

irinina [24]

Answer:

$h=10m$

Explanation:

From the question we are told that:

Area $a=70 x 10^{-6}$

Force $F=7N$

Generally the equation for Pressure is mathematically given by

Pressure = Force/Area

$P=\frac{F}{A}$

$P=\frac{ 7}{(70 * 10^{-6})}$

$P= 1*10^{5} Pa$

Generally the equation for Pressure is also mathematically given by

$P=hpg$

Therefore

$h=\frac{P}{hg}$

$h=\frac{10000}{1000*9.8}$

$h=10m$

6 0

3 years ago