A cross-country runner runs 4 km in 15 minutes. What can you calculate using this information?

Answer:

ocean currents

Explanation:

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

Answer:

convection

Explanation:

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

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

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

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Answer:

The momentum will quadruple

Explanation:

Original momentum

momen = mv

now increase both

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

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.

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

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.

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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Answer:

Approximately 2.06⋅108 meters per second.

Explanation:

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.

Answer:

Medium

Explanation:

I took a test on this last semester.

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:

[tex] \bold{\underline{\underline{\underbrace{Answer}}}} [/tex]

5 images

Explanation:

⠀

⠀

What is reflection of light?

The reflection of light is the phenomenon in which the rays of light falls on the object and change it's path.

⠀

How image is formed in plane mirror?

When you look at the mirror the image is formed behind the mirror and it is virtual. The light from the object which reaches the mirror gets reflected back.

⠀

⠀

The formula to find the no. of images between the 2 plane mirror at any angle θ.

[tex] \sf No. \: of \: images = \frac{360 \degree}{ \theta} - 1[/tex]

According to the question the plane mirror is inclined at 60° angle.

Substituting the required values.

[tex] \sf \large \frac{ \cancel{360} \small \: \: 6}{ \cancel{60}} - 1 \\ \\ \sf \large 6 - 1 \\ \\ \boxed{ \frak{ \implies 5} }[/tex]

The 2 plane mirror will form 5 images inclined at 60° angle.

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

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.

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.

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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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.

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:

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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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.

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

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

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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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].

Answer:

number of moles of gas.

Explanation:

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

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

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

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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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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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

Answer:

4 m/s

Explanation:

v=u+ at  and  v^2=u^2+2as.

It is given that  v=0,t=5  s    and  s=10  m.

⇒0=u+5a  and  0=u^2+20a.

⇒a=−u/5  and  a=−u^2/20.

⇒u/5 = u^2/20⇒u=4  m/s.

⇒  The initial velocity is  4  m/s.