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3 years ago

Kenny and Chris are walking down the road. They walk a distance of 250meters in

Physics

2 answers:

ruslelena [56]3 years ago

7 0

Explanation:

Distance is 250m

Time is 50sec

Formular

Speed= distance/time

Speed=250/50

Speed is 5m/s

If correct mark as brainliest

8_murik_8 [283]3 years ago

5 0

Answer:

$\boxed {\boxed {\sf 5 \ m/s}}$

Explanation:

Speed is the rate an object moves. It is found by dividing the distance by the time.

$s=\frac{d}{t}$

Kenny and Chris walked a distance of 250 meters in 50 seconds. So:

d= 250 m
t= 50 s

Substitute the values into the formula.

$s=\frac{250 \ m}{ 50 \ s}$

Divide.

$s= 5 \ m/s$

Kenny and Chris had an average speed of 5 meters per second.

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Explanation:

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3 years ago

Which subatomic particle has a negative charge?

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C. $\displaystyle electron$

Explanation:

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3 years ago

The blades in a blender rotate at a rate of 6100 rpm. When the motor is turned off during operation, the blades slow to rest in

MissTica

Answer:

155.80rad/s

Explanation:

Using the equation of motion to find the angular acceleration:

$\omega_f = \omega_i + \alpha t$

$\omega_f$ is the final angular velocity in rad/s

$\omega_i$ is the initial angular velocity in rad/s

$\alpha$ is the angular acceleration

t is the time taken

Given the following

$\omega_f = 6100rpm$

Time = 4.1secs

Convert the angular velocity to rad/s

1rpm = 0.10472rad/s

6100rpm = x

x = 6100 * 0.10472

x = 638.792rad/s

$\omega_f = 638.792rad/s\\$

Get the angular acceleration:

Recall that:

$\omega_f = \omega_i + \alpha t$

638.792 = 0 + ∝(4.1)

4.1∝ = 638.792

∝ = 638.792/4.1

∝ = 155.80rad/s

Hence the angular acceleration as the blades slow down is 155.80rad/s

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3 years ago

[10 POINTS ❗️❗️ and brainlist :)]

ludmilkaskok [199]

The answer to this is D

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3 years ago

Read 2 more answers

The surface of the Sun has a temperature of about 5 800 K. If the radius of the Sun is 7 × 108 m, determine the power output of

Nimfa-mama [501]

Answer:

a. $3.95\times10^{26}$ W

Explanation:

$T$ = temperature of the surface of sun = 5800 K

$r$ = Radius of the Sun = 7 x 10⁸ m

$A$ = Surface area of the Sun

Surface area of the sun is given as

$A = 4\pi r^{2} \\A = 4(3.14) (7\times10^{8})^{2}\\A = 6.2\times10^{18} m^{2}$

$e$ = Emissivity = 1

$\sigma$ = Stefan's constant = 5.67 x 10⁻⁸ Wm⁻²K⁻⁴

Using Stefan's law, Power output of the sun is given as

$P = \sigma e AT^{4} \\P = (5.67\times10^{-8}) (1) (6.2\times10^{18}) (5800)^{4}\\P = 3.95\times10^{26} W$

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4 years ago