1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katen-ka-za [31]
3 years ago
11

Humans have existed for about 106 years, whereas the universe is about 1010 years old. If the age of the universe is defined as

1 "universe day," where a universe day consists of "universe seconds" as a normal day consists of normal seconds, how many universe seconds have humans existed?
Physics
1 answer:
son4ous [18]3 years ago
8 0

Answer:

8.64 seconds

Explanation:

According to the question

10^{10}\ years=1\ day

1\ year=\dfrac{1}{10^{10}}\ day

Humans have lived for 10^6 years

In one universe day

10^6\ years=10^6\times \dfrac{1}{10^{10}}=10^{-4}\ day

In seconds

10^{-4}\times 24\times 60\times 60=8.64\ seconds

In one universe day humans have lived for 8.64 seconds

You might be interested in
Two glass marbles (1 and 2), each supported by a nylon thread, are rubbed against a piece of silk and then are placed near a thi
iragen [17]

Answer:

d.) Marbles 1 and 2 repel each other, but no interaction occurs with marble

Explanation:

Rubbing the glass against the silk charges the glass positively.

Assuming polarization is ignored,

●Glass won't conduct electrical charge. Therefore, acting as a insulator.

●neutral objects won't distribute it's charge when affected by charge objects in proximity. Therefore, over the marble surface, the charge remain spherically symmetrical (undisturbed)

Marble 1 is positive

Marble 2 is positive

Since marble 1 and 2 are positive, repulsion will occur.

marble 3 is neutral (still assuming polarization is ignored), therefore, no interaction with marble 1 and 2

D is the answer.

4 0
3 years ago
Copper wire of diameter 0.289 cm is used to connect a set of appliances at 120 V, which draw 1850 W of power total. The resistiv
vodka [1.7K]

Answer:

(a) The power wasted for 0.289 cm wire diameter is 15.93 W

(b) The power wasted for 0.417 cm wire diameter is 7.61 W

Explanation:

Given;

diameter of the wire, d = 0.289 cm = 0.00289 m

voltage of the wire, V = 120 V

Power drawn, P = 1850 W

The resistivity of the wire, ρ = 1.68 x 10⁻⁸ Ω⋅m

Area of the wire;

A = πd²/4

A = (π x 0.00289²) / 4

A = 6.561 x 10⁻⁶ m²

(a) At 26 m of this wire, the resistance of the is

R = ρL / A

R = (1.68 x 10⁻⁸  x 26) / 6.561 x 10⁻⁶

R = 0.067 Ω

Current in the wire is calculated as;

P = IV

I = P / V

I = 1850 / 120

I = 15.417 A

Power wasted = I²R

Power wasted = (15.417²)(0.067)

Power wasted = 15.93 W

(b) when a diameter of 0.417 cm is used instead;

d = 0.417 cm = 0.00417 m

A = πd²/4

A = (π x 0.00417²) / 4

A = 1.366 x 10⁻⁵ m²

Resistance of the wire at 26 m length of wire and  1.366 x 10⁻⁵ m² area;

R = ρL / A

R = (1.68 x 10⁻⁸  x 26) / 1.366 x 10⁻⁵

R = 0.032 Ω

Power wasted = I²R

Power wasted = (15.417²)(0.032)

Power wasted = 7.61 W

5 0
3 years ago
What happens when a star exhausts its core hydrogen supply?
Allushta [10]

Answer:

It becomes a giant or supergiant.

Explanation:

Once all the hydrogen supply is gone, fusion of hydrogen into helium stops. The core starts to contract and liberates energy, which heats the superior layer until it becomes hot enough to start the fusion of hydrogen into helium.

6 0
3 years ago
Which of the following supplies the heat for the hot reservoir in a car's engine?
nata0808 [166]
Out of the choices given, igniting the gas-air mixture supplies the heat for the hot reservoir in a car's engine. The correct answer is C. 
8 0
3 years ago
Read 2 more answers
Ethan moves a 100 kg barrel up a 50 meter ramp. The amount of work Ethan has completed is:
Zinaida [17]

Answer:

I think C. 150 Joules

Explanation:

4 0
2 years ago
Read 2 more answers
Other questions:
  • If a carbon atom was broken in half, would it still be carbon?
    7·1 answer
  • How many atoms are in a 4.30 cm à 4.30 cm à 4.30 cm cube of aluminum?
    7·1 answer
  • A small, single engine airplane is about to take off. The airplane becomes airborne, when its speed reaches 161.0 kmph. The cond
    8·1 answer
  • A person watches an ambulance drive by them while emitting a steady sound from its siren. When the ambulance passes the person (
    12·1 answer
  • What is the speed of a person walking 7mi in 2hours
    10·2 answers
  • Monochromatic light is incident on a metal surface and electrons are ejected. If the intensity of the light is increased, what w
    14·1 answer
  • The radius of the aorta in a test subject determined by MRI is 1.2 cm. At rest, his end diastolic volume is 120 mL and his end s
    7·1 answer
  • Which of the following is NOT a kind of energy store?
    8·1 answer
  • Which part of the scientific method is most likely to lead to changes in a theory? (1 point)
    15·1 answer
  • All of the following are dimensions of progressive overload except multiple choice specificity. time. intensity. frequency.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!