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3 years ago

10

Edwin Hubble was one of the first scientists to show that galaxies are getter farther apart from each other. (A.) True (B.) Fals

e

2 answers:

lara [203]3 years ago

5 0

The answer is A: True

i hopes this helps :D

grandymaker [24]3 years ago

5 0

The answer is True becuase

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A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A

tino4ka555 [31]

Answer:

(a) Negative Q

(b) Positive Q

Explanation:

Charge is the inherent property of matter due to the transference of electrons.

There are three methods of charging a body.

(i) Charging by friction: When two uncharged bodies rubbed together, then one body gets positive charged and the other is negatively charges it is due to the transference of electrons form one body to another.

(ii) Conduction: when a charged body comes in contact with the another uncharged body, the uncharged body gets the same charge and the charge is distributed equally.

(iii) Induction: When a uncharged body keep near the charged body, the uncharged body gets the same amount of charge but opposite in sign.

(a) When a small tack of charge Q is lowered into the hole, then due to the process of induction, the charge on the inner surface of the shell is - Q.

(b) Due to the process of conduction, the charge on the outer surface of the shell is Q.

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3 years ago

Which resistors in the circuit must always have the same voltage?

Fofino [41]

the circutory voltages do the amnesian property of circuits

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3 years ago

What element is a halogen with 5 energy levels

zhenek [66]

Answer:

astatine

Explanation:

Sorry if this is wrong i am not a hundred percent sure.

7 0

4 years ago

Read 2 more answers

How many kilograms of ice at a temperature of − 21.0 ∘C must be dropped in the water to make the final temperature of the system

Mashcka [7]

Answer:

0.1826 kg of ice is to be dropped in water to make the temperature of system to 23.3 C.

Explanation:

The amount of the heat lost by the water is the heat gained by the ice so by applying the balance of heat introduced and removed from the system, (assuming the container is insulated and is of negligible mass)

$m_ic_i\Delta T_i+m_ic_w\Delta T_2+m_i L_f=m_wc_w\Delta T_3$

Here

$m_i$ is the mass of ice which is to be calculated.
$c_i$ is the specific heat of ice which is 2100 J/kg.K

$c_w$ is the specific heat of ice which is 4190 J/kg.K
$\Delta T_i$ is the change of temperature from -21 C to 0 C.
$\Delta T_2$ is the change of temperature from 0 to 23.3 C.
$L_f$ is the Latent heat of Fusion which is 3.34×105 J/kg
$m_w$ is the mass of water which is given as 0.345 kg.
$\Delta T_3$ is the change of temperature from 83.4 C to 23.3 C.

$m_i=\frac{m_wc_w\Delta T_3}{c_i\Delta T_i+c_w\Delta T_2+L_f}\\m_i=\frac{0.345 \times 4190 (83.4-23.3)}{2100 \times (0-(-21.0))+4190 \times (23.3-0)+3.34 \times 10^5}\\m_i=0.1826 \, kg$

Here 0.1826 kg of ice is to be dropped in water.

5 0

3 years ago

An elevator manufacturing company is stress-testing a new elevator in an airless test shaft. The elevator is traveling at an unk

devlian [24]

Answer:

3.192 m/s

Explanation:

t = Time taken = 0.900 seconds

u = Initial velocity

v = Final velocity

s = Displacement = 1.1 meters

a = Acceleration due to gravity = 9.81 m/s²

$s=ut+\frac{1}{2}at^2\\\Rightarrow u=\frac{s-\frac{1}{2}at^2}{t}\\\Rightarrow u=\frac{1.1-\frac{1}{2}\times 9.81\times 0.9^2}{0.9}\\\Rightarrow u=-3.192\ m/s$

Velocity of the elevator when it snapped is 3.192 m/s

4 0

3 years ago