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4 years ago

11

which of this is not example of simple machine? A) a crowbar,B)a knife,C)a bicycle,D)a wheelchair ramp

1 answer:

DaniilM [7]4 years ago

3 0

B. Knife HOpe this helps :3

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What is the purpose of a rearview mirror in a car?

Shalnov [3]

The third choice.

The driver wants to see the object that is behind him. The light reflects off the mirror into the eyes of the driver portraying the object behind him

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3 years ago

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Dario, a prep cook at an Italian restaurant, spins a salad spinner and observes that it rotates 20.0 times in 5.00 seconds and t

BabaBlast [244]

Answer:

$-\frac{8\pi}{3}rad/s^2$

Explanation:

To solve this problem we need to apply the concept related to Angular Acceleration. We can find it through the equation

$\omega_f^2-\omega_i^2=2\alpha\theta$

Where for definition,

$\omega_i = \frac{\theta}{t}$

The number of revolution $(\theta)$ was given by 20 times, then

$\omega_i = \frac{20*2pi}{5}$

$\omega = 8\pi rad/s$

We know as well that the salad rotates 6 more times, therefore in angle measurements that is

$\theta = 6*2\pi rad = 12\pi rad$

The cook at the end stop to spin, then using our first equation,

$0-8\pi = 2\alpha (12\pi)$

re-arrange to solve $\alpha$ ,

$\alpha = \frac{-8\pi}{2*12\pi}$

$\alpha = -\frac{8\pi}{3}rad/s^2$

We can know find the required time,

$\omega_f-\omega_i = \alpha t$

Re-arrange to find t, and considering that $\omega_f=0$

$t= \frac{\omega_i}{\alpha}$

$t=\frac{-8\pi}{-8\pi/3}$

$t=3s$

Therefore take for the salad spinner to come to rest is 3 seconds with acceleration of $-\frac{8\pi}{3}rad/s^2$

6 0

3 years ago

Read 2 more answers

Speed is always measured in terms of a unit of distance divided by a unit of time, is this correct?

maw [93]

Answer: speed is not measured in time but in distance like 100 feet per second that is how speed is measured.

5 0

2 years ago

The force of friction on an object is dependent on two things. what are they?

ruslelena [56]

1.the kinds of surface
2.the amount of force pushing the surfaces together

7 0

3 years ago

1. A 1000 kg bag of sand has an<br> acceleration of 0.5m/s/s. What is the<br> force on the bag?

densk [106]

Answer:

We conclude that the force on the bag is 500 N.

Explanation:

Given

Mass m = 1000 kg

Acceleration a = 0.5 m/s²

To determine

Force F = ?

We know that when a force is applied to a body, it produces acceleration.

<u>Important Tip: </u>

We can determine the force on the bag using the formula F = ma

Using the formula

$F = ma$

where

$F$ is the force

$m$ is the mass

$a$ is the acceleration

now substitute m = 1000, and a = 0.5 m/s² in the formula

$F = ma$

$F = (1000)(0.5)$

$F=500$ N

Therefore, we conclude that the force on the bag is 500 N.

5 0

3 years ago