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3 years ago

Which statement is true about the Big Bang Theory?

Physics

1 answer:

zmey [24]3 years ago

4 0

I think it’s A.) it explains why the universe is made up of matter

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Which statement best describes air pressure at high altitudes? (Points : 3)

WARRIOR [948]

Air pressure decreases as altitude increases. this is because air pressure is caused by the gravity of earth, the gravity pulls on the air, compacting it and making a pressure.
But as we go higher, gravity decreases, causing less pull on the air resulting in less air pressure.

5 0

3 years ago

Read 2 more answers

A wave travels at a frequency of 387 Hz. What is the period of the wave?

Ulleksa [173]

Answer:

¹/₃₈₇ second

Explanation:

The period of a wave is the reciprocal of its frequency.

So, simply, the frequency is ¹/₃₈₇ second(s), as that is the reciprocal of the frequency, 387 Hz.

5 0

4 years ago

James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running s

liraira [26]

Answer:

Both of them reach the lake at the same time.

Explanation:

We have equation of motion s = ut + 0.5at²

Vertical motion of James : -

Initial velocity, u = 0 m/s

Acceleration, a = g

Displacement, s = h

Substituting,

s = ut + 0.5 at²

h = 0 x t + 0.5 x g x t²

$t_{James}=\sqrt{\frac{2h}{g}}$

Vertical motion of John : -

Initial velocity, u = 0 m/s

Acceleration, a = g

Displacement, s = h

Substituting,

s = ut + 0.5 at²

h = 0 x t + 0.5 x g x t²

$t_{John}=\sqrt{\frac{2h}{g}}$

So both times are same.

Both of them reach the lake at the same time.

3 0

3 years ago

A 75.00 gram sample of an unknown metal initially at 99.0 degrees Celcius is added to 50.00 grams of water initially at 10.79 de

jeyben [28]

Answer:

$c_{e1}$ = 0.331 J / g ° C

Explanation:

We have a calorimetry exercise where all the heat yielded by one of the components is absorbed by the other.

Heat ceded Qh = m1 ce1 ( $T_{h}$ - $T_{f}$ )

Heat absorbed Qc = m2 ce2 ( $T_{f}$ - T₀)

Body 1 is metal and body 2 is water . Where m are the masses of the two bodies, ce their specific heat and T the temperatures

Qh = Qc

m₁ $c_{e1}$ ( $T_{h}$ - $T_{f}$ ) = m₂ $c_{e2}$ ( $T_{f}$ - T₀)

we clear the specific heat of the metal

$c_{e1}$ = m₂ $c_{e2}$ ( $T_{f}$ - T₀) / (m₁ ( $T_{h}$ - $T_{f}$ ))

$c_{e1}$ = 50.00 4.184 (20.15 -10.79) / (75.00 (99.0-20.15))

$c_{e1}$ = 209.2 (9.36) / (75 78.85)

$c_{e1}$ = 1958.11 / 5913.75

$c_{e1}$ = 0.331 J / g ° C

5 0

3 years ago

Consider a basketball player spinning a ball on the tip of a finger. If a player performs 1.99 J of work to set the ball spinnin

sladkih [1.3K]

Answer:

25.8 rad/s

Explanation:

C = circumference of the hollow sphere = 0.749 m

r = radius of the sphere

Circumference of the hollow sphere is given as

C = 2π r

0.749 = 2 (3.14) r

r = 0.12 m

m = mass of the basketball = 0.624 kg

Moment of inertia of basketball is given as

$I = \left ( \frac{2}{3} \right )mr^{2}$

$I = \left ( \frac{2}{3} \right )(0.624)(0.12)^{2}$

I = 5.99 x 10⁻³ kg-m²

w = angular speed

KE = Kinetic energy of the ball = 1.99 J

Kinetic energy of the ball is given as

KE = (0.5) I w²

1.99 = (0.5) (5.99 x 10⁻³) w²

w = 25.8 rad/s

5 0

3 years ago