how far can a person run in 15 minutes if he or she runs a at an average speed of 16 km/hr? what is the runners distance traveled in miles

Answers

Answer 1

Answer: To find this, we would divide 60 by 15 because there is 60 minutes in an hour and we're trying to find how much of 16 km he can run in 15 minutes. When we divide 60 by 15 we get 4. Now we divide 16 by 4 to get 4. So he can run 4 km in 15 minutes.

Answer 2

Answer:

Answer:

2.5

Explanation:

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How does the concentration of a hydrogen ion affect the ph levels of a substance?

Answers

Acidic and basic are two extremes that describe chemicals, just like hot and cold are two extremes that describe temperature. Mixing acids and bases can cancel out their extreme effects, much like mixing hot and cold water can even out the water temperature. A substance that is neither acidic nor basic is neutral.

The character of acidic, basic and neutral is defined by the concentration of hydrogen ions [H+](mol/L). A solution with a concentration of hydrogen ions higher than 10-7mol/L is acidic, and a solution with a lower concentration is alkaline (another way to say basic). Using the formula, pH=-log[H+], a pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic. As one can see from this formula, ten times a given concentration of hydrogen ions means one unit lower in terms of pH value (higher acidity), and vice versa.

Pure water is neutral, with a pH of 7.0. When chemicals are mixed with water, the mixture can become either acidic or basic. Vinegar and lemon juice are acidic substances, while laundry detergents and ammonia are basic.

Chemicals that are very basic or very acidic are called "reactive." These chemicals can cause severe burns. Automobile battery acid is an acidic chemical that is reactive. Automobile batteries contain a stronger form of some of the same acid that is in acid rain. Household drain cleaners often contain lye, a very alkaline chemical that is reactive.

Currently, is our planet an open or closed system?

Answers

Our planet is closed system because there is a limit of how much matter could be exchanged.

How do you connect 1 ohm, 2 ohm and 3 ohm resistors to getan equivalent resistance of 5/6 ohm.

Answers

You (or your homework sheet) may be fishing for the answer "connect
the 3 resistors in parallel", but that does not do the job.

When those 3 resistors are connected in parallel, their combined resistance
is 6/11 ohm.

If the 2 and the 3 alone are in parallel, their combination is 6/5 ohms, and
adding the 1 ohm in series makes 2.2 ohms.

If the 1 and the 2 alone are in parallel, their combination is 2/3 , and adding
the 3 in series makes 3 and 2/3 .

If the 1 and the 3 alone are in parallel, their combination is 3/4 , and adding
the 2 in series makes 2.75 .

There is nothing you can do with those 3 resistors, or with any 2 of them,
or with any 1 of them, that will give you 5/6 ohm .

An internal combustion engine uses fuel, of energy content 44.4 MJ/kg, at a rate of 5 kg/h. If the efficiency is 28%, determine the power output and the rate of heat rejection

Answers

Efficiency = Power Output / Power Input

Power Input = Rate of Energy input = 44.4 MJ/kg * 5 kg/h

= 222 MJ/h

But 1 hour = 3600seconds

222 MJ/h = 222 MJ/3600s = 0.061667 MW J/s = Watts

Power input = 0.061667 MW = 61 667 W

From Efficiency = Power Output / Power Input

   28% = Power Output / 61667

   Power Output = 0.28 * 61667

   Power Output = 17266.76 W

Power Output = 17 267 W

Rate of heat Rejection = Power input - Power output

      = 61667 - 17267 = 44400 W

Rate of heat Rejection = 44 400 W.

C- Copyright.

Which of the following do waves carry?a) matter
b) energy
c) matter and energy
d) the medium

Answers

Waves carries energy among the given options. Hence, option (b) is correct.

What is wave?

A wave is a dynamic disturbance that propagates and causes a change in equilibrium of one or more parameters in physics, mathematics, and related subjects. Quantities may oscillate regularly around an equilibrium (resting) value at certain frequency if a wave is periodic.

A travelling wave is one in which the entire waveform moves in one direction; in contrast, a standing wave is one in which two periodic waves are overlaid and move in the opposing directions. In a standing wave, there are some points where the wave amplitude seems reduced or even zero, and these positions have null vibration amplitudes.

Wave equations (standing wave fields of two opposing waves) or one-way wave equations (single wave propagation in a certain direction) are frequently used to describe waves.

Learn more about wave here:

brainly.com/question/3639648

#SPJ6

i would go with energy, because they give alllooooot of energy, from the waves.
hope that this would help you! =)

A runner is at the starting line and hears the starting gun. He starts running from rest with a constant acceleration ai = 0.53 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him a time interval tr to cross the finish line. It takes him a time interval ts = 7.5 s to return to rest after crossing the finish line. Use the given coordinate system where x is positive to the right. a)Enter an expression for the time, tr, it takes for the runner to cross the finish line, in terms of d and ai

Answers

To find the time, tr, it takes for the runner to cross the finish line, we can use one of the kinematic equations that relate displacement, initial velocity, acceleration, and time. Since the runner starts from rest, his initial velocity is zero, so we can use the equation:

Δx=v0t+21at2

where Δx is the displacement, v0 is the initial velocity, a is the acceleration, and t is the time. Plugging in the given values of Δx=d, v0=0, and a=ai, we get:

d=0+21ait2

Solving for t, we obtain:

t=ai2d

This is the expression for the time, tr, it takes for the runner to cross the finish line, in terms of d and ai.

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