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3 years ago

11

Taylor mixes two liquids together in a beaker. A solid forms at the bottom of the beaker, and the liquid changes from pink to bl

ue. Which of the following is true about the properties of the products?

1 answer:

Dimas [21]3 years ago

3 0

It is a chemical change and a physical change

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A merry-go-round at a playground is a circular platform that is mounted parallel to the ground and can rotate about an axis that

hram777 [196]

Answer:

$V_2=3.3m/s$

Explanation:

From the question we are told that:

Distance $d_1=1.4m$

Tangential speed $V=2.2m/s$

Distance 2 $d_2=2.1m$

Generally the equation for Angular velocity is mathematically given by

$w=\frac{v}{r}$

Therefore

$\frac{v_1}{r_1}=\frac{v_2}{r_2}$

$V_2=\frac{2.2*2.1}{1.4}$

$V_2=3.3m/s$

8 0

3 years ago

What is the mass of a 2 kg object on the Earth and on the moon?

ArbitrLikvidat [17]

Answer: A 2.00-kilogram object weighs 19.6 newtons on Earth.

Explanation:

4 0

3 years ago

Two cars are lifted to the same elevation in a service station. If one car is twice as massive as the other, how do their potent

Ymorist [56]

Answer:

1. The car which is twice as massive as the other will have twice potential energy.

Explanation:

The potential energy of an object is given by:

$U=mgh$

where

m is the mass of the object

g is the gravitational acceleration

h is the height of the object measured to some reference level

In this problem, we have two cars at same elevation (= same h in the formula) but one car has twice the mass of the second car. Calling m the mass of one car and 2m the mass of the second car, we have:

- Potential energy of the first car:

$U=mgh$

- potential energy of the second car:

$U'=(2m)gh=2mgh=2U$

So, the car which is twice as massive as the other will have twice potential energy.

3 0

4 years ago

While performing an experiment, the student creating the data table is not sure if a measurement from the experiment is a vector

marin [14]

Before coming into conclusion first we have to understand both scalar and vector .

A scalar quantity is a physical quantity which has only magnitude for it's complete specification.

A vector quantity is that physical quantity which not only requires magnitude but also possesses direction for it's complete specification.

So the most important factor that differentiate vector from scalar is the direction.

As per the question the student is doing an experiment where he is recording the data obtained during the process.

In order to arrange them in data table, he should ask about the direction of the quantity under consideration.

Hence the correct option is the third option(C)i.e does the measurement include direction?

7 0

3 years ago

Read 2 more answers

At a time t = 2.80 s , a point on the rim of a wheel with a radius of 0.230 m has a tangential speed of 51.0 m/s as the wheel sl

bonufazy [111]

Answer:

Part A) the angular acceleration is α= 44.347 rad/s²

Part B) the angular velocity is 195.13 rad/s

Part C) the angular velocity is 345.913 rad/s

Part D ) the time is t= 7.652 s

Explanation:

Part A) since angular acceleration is related with angular acceleration through:

α = a/R = 10.2 m/s² / 0.23 m = 44.347 rad/s²

Part B) since angular acceleration is related

since

v = v0 + a*(t-t0) = 51.0 m/s + (-10.2 m/s²)*(3.4 s - 2.8 s) = 44.88 m/s

since

ω = v/R = 44.88 m/s/ 0.230 m = 195.13 rad/s

Part C) at t=0

v = v0 + a*(t-t0) = 51.0 m/s + (-10.2 m/s²)*(0 s - 2.8 s) = 79.56 m/s

ω = v/R = 79.56 m/s/ 0.230 m = 345.913 rad/s

Part D ) since the radial acceleration is related with the velocity through

ar = v² / R → v= √(R * ar) = √(0.23 m * 9.81 m/s²)= 1.5 m/s

therefore

v = v0 + a*(t-t0) → t =(v - v0) /a + t0 = ( 1.5 m/s - 51.0 m/s) / (-10.2 m/s²) + 2.8 s = 7.652 s

t= 7.652 s

4 0

3 years ago