Ask question

Ask question

All categories

2 years ago

14

A runner completes the 300-meter dash in 38 seconds. What is the speed of the runner? Round your answer the answer to the neares

t tenth.

1 answer:

loris [4]2 years ago

6 0

Answer:

speed = 7.9 m/s

Explanation:

speed = total distance / time taken

speed = 300 / 38

speed = 7.89473684 m/s

to the nearest tenth

speed = 7.9 m/s

You might be interested in

A plane rises from take-off and flies at an angle of 5 degrees5° with the horizontal runway. When it has gained 800800 feet, f

dedylja [7]

Answer:

$distance=9188149.567feet$

Explanation:

Given Data

Angle α=5°

height h=800800 feet

To find

Distance r

Solution

As we Know that

$Sin\alpha =(\frac{Perpendicular}{hypotenuse} )\\Sin\alpha =\frac{h}{r}\\ r=\frac{h}{Sin\alpha}\\ r=\frac{800800feet}{Sin(5^{o} )}\\ r=9188149.567feet$

4 0

2 years ago

Suppose that during any period of ¼ second there is one instant at which the crests or troughs of component waves are exactly in

kolezko [41]

<h3><u>Answer;</u></h3>

A. 4

<h3><u>Explanation;</u></h3>

<em><u>The period of a wave or periodic time is the time taken for a complete oscillation to occur. </u></em>For example its is the time taken between two successive crests or troughs.
<em><u>The beats or oscillation that occur in one second represents the frequency. Frequency is the number of complete oscillations or beats in one second in a wave.</u></em>
Frequency, measured in Hertz is given by the reciprocal of the periodic time.
Thus; <u><em>Frequency or beats per second = 1/(1/4) = 4</em></u>
<u><em>Hence , 4 beats per second</em></u>

6 0

2 years ago

HELP ASAP! GIVING BRAINLIEST!

Blababa [14]

Answer:

1. Emma standing on top of mountain

Since she is at the rest position and at some height from the ground so here energy is due to gravitational potential energy

So we have

gravitational potential energy

$U = mgH$

2. Emma jumping down from mountain top

Due to free fall Emma will start moving with some speed in downwards direction so here we have

$KE = \frac{1}{2}mv^2$

motion energy

3. tension in rope at Emma’s lowest position

Due to stretch in the rope here position come to the lowest end and speed comes to zero so whole energy is converted into elastic potential energy

$U = \frac{1}{2}kx^2$

elastic potential energy

4. Emma bouncing back

Due to bouncing back she will again have its kinetic energy with some speed upwards

$KE = \frac{1}{2}mv^2$

motion energy

8 0

2 years ago

Read 2 more answers

What disadvantage does floating buoys have when it comes to converting wave energy to electrical energy? A) They generate only m

arsen [322]

Answer:

B

Explanation:

6 0

2 years ago

2. A certain object revolves at a rate of 30 rpm. Please determine the frequency and period of this

schepotkina [342]

Answer:

The time period of the motion is, T = 0.03 s

The frequency of the rotation is, f = 30 Hz

Explanation:

Given data,

The rotational speed of an object, ω = 30 rpm

ω = 188.5 rad/s

The time period of motion is,

T = 2π / ω

Substituting the given values in the above equation

= 2π / 188.5

T = 0.03 s

The time period of the motion is, T = 0.03 s

The frequency of rotation,

f = 1 /T

= 1 / 0.03

= 30 Hz

Hence, the frequency of the rotation is, f = 30 Hz

7 0

3 years ago