At what time did time begin


50 points :)

Answers

Answer 1

Answer:

According to the standard big bang model of cosmology, time began together with the universe in a singularity approximately 14 billion years ago.

Explanation: the big bang

Answer 2

Answer:

approximately 14 billion years ago


Related Questions

Which of the following statements are true about gravity?
Check all that apply.
O A. Gravity doesn't exist between the Earth and the sun.
B. Gravity exists in the whole universe.
C. Gravity is a force that pushes two or more objects apart.
D. Gravity exists between two or more objects that have mass.

Answers

Answer:

B and D

Explanation:

A is wrong because objects with mass have gravity and the Earth and Sun both have mass. As we know, the Earth orbits around the Sun and the reason si because gravity.

B is corrects because throughout the whole universe there are objects like planets and meteors and more. All these objects have gravity because they have mass.

C Gravity pulls things together that is why we are on Earth and not pushed away into space.
D is correct, using Sun and a meteor. When a meteor comes within the gravity range of the sun, the sun pulls the meteor toward it. Without anything around the sun, nothing happens because there is nothing to pull.

if both the mass and velocity of a moving object are doubled, how will the objects momentum change

Answers

Answer:

The momentum will quadruple

Explanation:

Original momentum

momen = mv

now increase both

 momen = 2m * 2v = 4 mv  <====== the momentum has quadrupled

Explain how the motor takes advantages of electromagnetism to work?

Answers

Answer:
When current flows through the motor, the electromagnet rotates, causing a shaft to rotate as well. The rotating shaft moves other parts of the device.

Explanation:
An electric motor is a device that uses an electromagnet to change electrical energy to kinetic energy.

Side note:
Hope this helps!
Please give Brainliest!

1. A material through which a wave travels

A.) Velocity
B.) Increases
C.) Decreases
D.) speed
E.) medium

Answers

Answer:

Medium

Explanation:

I took a test on this last semester.

what do a class 1 lever and a class 2 lever have in common?

a)both levers place the fulcrum in between the applied force and the object being lifted.

b)both levers would lift an object on the same side of the fulcrum as the applied force

c)both levers have an output force in the same direction as the input force.

d)both levers result in a larger output force from a smaller input force.

Answers

The similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.

What is a lever?

A lever is a rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied.

A lever has three classes based on the position of the fulcrum as follows:

Class 1 has the fulcrum placed between the effort and load Class 2 has the load between the effort and the fulcrumClass 3 has the effort between the load and the fulcrum

Therefore, the similarity between class 1 lever and a class 2 lever is that both levers would lift an object on the same side of the fulcrum as the applied force.

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In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in". Explain what is actually happening to the flow of heat in this scenario.​

Answers

When the window is closed the heat is trapped inside the classroom which is circulating around the room but when the window is opened, the heat is escaping so most of the heat is escaping rather than circulating the room.

In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in" because of the thermal gradient present between the outside colds air and the warm air present inside the room, as the window gets closed the outside air would not able to extract the thermal energy of the warm air present inside the room.

What is thermal energy?

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

Thermal energy can be produced with help of various means such as by burning fossil fuels, with the help of solar energy.

As given in the problem statement In winter, your classroom is warmed by a heater. Your teacher asks you to close the window because "this will stop the cold from getting in because when the window is closed the cold air from the outside would not be able to extract the heat from the warmed air present inside the room

Thus, the flow of heat would get obstructed by the closing of the window

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a force of 50 N directed 30 degrees above the horizontal is applied to a 10 kg block at rest on a rough horizontal surface. what is the coefficient of kinetic friction between the block and the horizontalsurface if the acceleration of the block is 20 m/s^2

Answers

The coefficient of kinetic friction between the block and the horizontal surface will be 1.597.

What is kinetic friction?

A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion.

The given data in the problem is;

μ is the coefficient of kinetic friction=?

m is the mass of the block=10 kg

g is the acceleration due to gravity= 9.81 m/s²

Acceleration of block(a)=20 m/s²

Force (F)= 50 N

θ=30°

There are two forces to act on the block, one is the force directed while the other was the friction force opposing the motion.

From the newton's second law;

F= ma

F-f = ma

Fcos30°- μmg=ma

50cos 30°-μ× 10×9.81 =10 × 20

μ= 1.597

Hence, the  coefficient of kinetic friction will be 1.597.

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All the following are momentum oscillators except a. Relative Strength Index (RSI) b. Moving Average Convergence/Divergence (MACD) c. Stochastics d. Advance/Decline Line

Answers

All the following are momentum oscillators except Advance/Decline Line.

What are momentum oscillators?

Momentum oscillators measure the amount that a security's price has changed over a given period of time.

Examples of momentum oscillatorsRelative Strength Index (RSI) Moving Average Convergence/Divergence (MACD) Stochastics

Thus, all the following are momentum oscillators except Advance/Decline Line.

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In the circuit shown in Fig. E26.17, the voltage across the 2.00 Ω resistor is 12.0 V. What are the emf of the battery and the current through the 6.00 Ω resistor?

Answers

The emf of the battery of the given circuit is 18 volts and the current through the 6 ohm resistor is 3A.

What is ohm's law?

In a current carrying conductor, the voltage difference V is directly proportional to the current I through the conductor. The constant is called the resistance R.

i.e V=IR.

Emf of the battery is equal to e = V1 +V2

Current through 2 ohm resistor, I2 = V2 /R

I2 = 12/2

I2 =6 A

Voltage through 1 ohm resistor V1 = I1 R

V1 = 6 x 1 =6 volts

Emf of the battery E = 6+12 =18 volts.

The current  through 6 ohm resistor is

I = 18 /6 = 3 A

Thus, emf of the battery is 18 volts and the current through the 6 ohm resistor is 3A.

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A crowbar moves a distance of .35 meter to lift a load .05 meters off the ground.



what is the ideal mechanical advantage of the crowbar?

Answers

The ideal mechanical advantage of the crowbar will be 0.7.IMA is also equal to the distance traveled by the load divided by the distance traveled by the effort.

What is ideal mechanical advantage?

The ideal mechanical advantage of a lever is equal to the length of the effort arm divided by the length of the resistance arm.

The ideal mechanical advantage is found as;

[tex]\rm IMA=\frac{0.35}{0.5} \\\\ IMA=0.7[/tex]

Hence,the ideal mechanical advantage of the crowbar will be 0.7.

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Compare the mass on neptune (68.11) to the weight on neptune (905.863). what is the difference? why is there a difference?

Answers

Mass = in kg or lbs

Weight is mass times gravity

When cell a sends a message to
cell b, ? occurs at cell
b.
a. osmosis
b. active transport
c. synaptic transmission

Answers

Answer:

c. Synaptic transmission

Explanation:

To transmit impulses/electronic signals around the body, nerve cells transfer messages across the synapse and the movement of the chemicals from one cell to the other is known as either diffusion or synaptic transmission.

would you consider caffeine to be more or less toxic then arsenic explain

Answers

Caffeine is a widely recognized psychostimulant compound with a long history of consumption by humans. While it has received a significant amount of attention there is still much to be learned with respect to its toxicology in humans, especially in cases of overdose. A review of the history of consumption and the clinical toxicology of caffeine including clinical features, pharmacokinetics, toxicokinetics, a thorough examination of mechanism of action and management/treatment strategies are undertaken. While higher (i.e., several grams) quantities of caffeine are known to cause toxicity and potentially lethality, cases of mainly younger individuals who have experienced severe side effects and death despite consuming doses not otherwise known to cause such harm is troubling and deserves further study. An attempted case reconstruction is performed in an effort to shed light on this issue with a focus on the pharmacokinetics and pharmacodynamics of caffeine. Arsine gas is the most toxic form of arsenic. Inhalation of over 10 ppm is lethal and at concentrations higher than 25 ppm are reported to be lethal in less than an hour after exposure., while over 250ppm is reported to be instantaneously lethal.

What causes trash islands to form
Answers:
Suface winds
Tropical storms
Ocean currents

Answers

Answer:

ocean currents

Explanation:

It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then...

Select one:
a. the pulley rope is pulled 1 meter.
b. the pulley rope is pulled more than 1 meter, but less than 3 meters.
c. the pulley rope is pulled 3 meters.
d. the pulley rope is pulled more than 3 meters.

Answers

Answer:

b

Explanation:

It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then the pulley rope is pulled more than 1 meter, but less than 3 meters.

It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then. The correct answer is a. the pulley rope is pulled 1 meter.

When lifting a piano using a pulley system, the distance the pulley rope is pulled will be the same as the distance the piano is lifted. This is due to the mechanical advantage of the pulley, which reduces the amount of effort needed to lift the piano but does not change the distance the rope is pulled.

In a simple single fixed pulley system, where one end of the rope is attached to a fixed point and the other end is used to lift the piano, the distance the pulley rope is pulled will indeed be the same as the distance the piano is lifted.

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Which physical activity would an augmented reality resource help you with? Diving High jumping Walking Weight lifting

Answers

Answer:

Keeping up your healthy lifestyle also means keeping up exercising. Exercise helps control your weight. It helps maintain it, or helps you loose weight. Even though having a healthy lifestyle, exercise also helps battle the chance of getting diseases and other illnesses. Exercise can help improve your energy level, as well as making sure you get the right amount of sleep. And besides all these, exercise can make you feel great in general, and help improve your overall mood.

Explanation:

Answer:

Diving, as it's not as accessible as the others.

Explanation:

Starting from rest on a level road a girl can reach a speed of 5 m/s in 10s on her bicycle. Find average speed and distance traveled in 10s.​

Answers

Answer:

Average speed = 2.5 mph

Distance = 22.352 meters

Explanation:

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

You can use this formula for any question like this

A temperature inversion prevents the ____ currents that would carry pollutants up into the atmosphere

Answers

Answer:

convection

Explanation:

What is the best definition
of the atomic number?
A. the number of protons found in the nucleus
B. the number of protons found outside the
nucleus
C. the number of neutrons found in the nucleus

Answers

a is the correct answer

Explanation:

no.of proton defines atomic number in an atom

Answer: a

Explanation:

An atomic number is the number of protons found in the nucleus. The number of protons is equal to the number of electrons. The atomic mass the atomic number add the amount of neutrons.

at constant temperature and pressure, gas volume is directly proportional to the

Answers

Answer:

number of moles of gas.

Explanation:

. Define density. How can you calculate density of an irregular shape solid body.

Answers

Answer:

a measure of the amount of information on a storage medium

Density= mass

                volume

it symbol is roh

Explanation:

To find density

we need the mass and volume we have to devide both of the

what do you know in climate change?​

Answers

Climate change is the reason for a lot of factors such as:

Heat-trapping Greenhouse Gases And The Earth's Climate

Greenhouse Gases

Reflectivity or Absorption of the Sun's Energy

Changes in the Earth's Orbit and Rotation

Variations in Solar Activity

Changes in the Earth's Reflectivity

Volcanic Activity

There's a lot more that I could list, but hopefully this will do.

A plane left 30 minutes late than its scheduled time and in order to reach the destination 1500 km away in time, it had to increase its speed by 100 km/h from the usual speed. Find its usual speed.

Answers

Answer:

Usual speed: [tex]500\; {\rm km \cdot h^{-1}}[/tex].

Explanation:

Let the usual duration of the trip be [tex]t[/tex] hours ([tex]t > 0[/tex].) The actual duration of this trip would be [tex](t - (1/2))[/tex] hours.

The usual speed would be:

[tex]\begin{aligned}\frac{1500}{t}\end{aligned}[/tex].

The actual speed would be:

[tex]\begin{aligned}\frac{1500}{t - (1/2)}\end{aligned}[/tex].

The actual speed is [tex]100\; {\rm km \cdot h^{-1}}[/tex] greater than the usual speed. In other words:

[tex]\begin{aligned}\frac{1500}{t - (1/2)} - \frac{1500}{t} = 100\end{aligned}[/tex].

Simplify this equation and solve for [tex]t[/tex] ([tex]t > 0[/tex]):

[tex]\begin{aligned}\frac{15}{t - (1/2)} - \frac{15}{t} = 1\end{aligned}[/tex].

[tex]\begin{aligned}15\, t - 15\, \left(t - \frac{1}{2}\right) = t^{2} - \frac{1}{2}\, t\end{aligned}[/tex].

[tex]\begin{aligned}t^{2} - \frac{1}{2}\, t - \frac{15}{2} = 0\end{aligned}[/tex].

[tex]2\, t^{2} - t - 15 = 0[/tex].

[tex](2\, t + 5)\, (t - 3) = 0[/tex].

Since [tex]t > 0[/tex], the only possible value for [tex]t[/tex] would be [tex]t = 3[/tex].

Thus, the usual duration of this trip would be [tex]3\; {\rm h}[/tex]. The usual speed of this trip would be:

[tex]\begin{aligned}v &= \frac{s}{t} = \frac{1500\; {\rm km}}{3\; {\rm h}} = 500\; {\rm km \cdot h^{-1}}\end{aligned}[/tex].

How much force is needed to accelerate a 100 kg car at a rate of 3 m/s

Answers

Formula to find force: acceleration x mass

100 x 3=300
300N is needed (force is measured in newtons)

Please help me guys please help please

Answers

Answer:

C = frequency × wavelength, where C is the speed of the photons which is the speed of light ~3×10^8

frequency = C/wavelength

f = 3×10^8/400×10^-9m

f = 3/4 × 10^15Hz

f = 0.75×10^15Hz

f = 7.5×10^14Hz

At time t = 0 s, an object is moving to the right
with a velocity v that can be modeled by the
equation v=(4.2 m/s)-(1.4 m/s?)t. At what time,
if any, does the object change its direction of
motion?

Answers

This object should not change its direction of motion because despite its velocity it will be still moving to the right.

What does the equation describe?

The equation describe the velocity of an object and how this velocity changes depending on time.

How is the direction of motion relate?

The equation does not describe the direction of motion. Due to this, it is expected the direction is the same and does not change.

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a body moves on to 120 km long track if he moves first 30 km with a speed of 30 km per hour then what is the speed for next 90 so that average speed becomes 60 km per hour​

Answers

Answer:

90 km/hr

Explanation:

AVERAGE is 60 km/hr  so   120 km / 60 km/hr = 2 hours total

first 30 km / 30 km / hr = 1 hour   used    1 hour left

  now there is 90 km to cover in the second hour

         so that must be   90 km/hr

What is the speed of light in quartz

Answers

Answer:

Approximately 2.06⋅108 meters per second.

Explanation:

The four fundamental forces are c. strong force, weak force, electromagnetic force, gravity. b. nuclear force, gravity, tidal force, magnetic force. d. nuclear force, electromagnetic force, gravity, tidal force. a. strong force, weak force, electric force, magnetic force.

Answers

Answer:

The statements that describe the relationship between history and geography are:

Geography is the setting of the history's story.

Geography plays a role in historic events.

History affects geography, and geography influences history.

The second, third, and the fifth statements are the correct answers.

Explanation:

first 1=2=5=3=0=5=8=7=x=y

The mass of the Moon is 7.35 × 1022 kg and its radius is 1738 km. What is the gravitational field strength on the surface of the Moon?

Answers

Answer:

g = 1.62 N/kg

Explanation:

g = GM/r²

  = (6.67 x 10⁻¹¹   x   7.35 x 10²²) / (1738 x 10³)²

  = 1.62 N/kg

Hope this helps!

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