1 Which requires more work, lifting a 10kg sack of<br> coal or lifting a 15kg bag of feathers?

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which co

svp [43]

Answer:

2 in front of water and 1 in front of oxygen

Explanation:

3 0

3 years ago

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Which of the following vectors is equal to r⃗ AB?

alisha [4.7K]

<h3>Vector AB is equal to vector DC</h3>

<h3>Further explanation</h3>

Vector is a quantity that has a magnitude and direction.

A vector in a cartesian coordinate is represented by an arrow in which the slope of the arrow shows the direction of the vector and the length of the arrow shows the magnitude of the vector.

A position vector of a point is a vector drawn from the base point of the coordinates O (0,0) to that point.

The addition of two vectors can be done in the following ways:

$\overrightarrow {AB} + \overrightarrow {BC} = \overrightarrow {AC}$

A negative vector is a vector with the same magnitude but in opposite direction.

$\overrightarrow {AB} = -\overrightarrow {BA}$

Let's tackle the problem!

Two vectors are equal if they have the same magnitude and direction. In the attached picture, it can be clearly seen that the vector AB has the same magnitude and direction with vector DC. Therefore, vector AB is equal to vector DC.

<h3>Learn more</h3>

Velocity of Runner : brainly.com/question/3813437

Kinetic Energy : brainly.com/question/692781

Acceleration : brainly.com/question/2283922

The Speed of Car : brainly.com/question/568302
Magnitude of A Vector : brainly.com/question/2678571

<h3>Answer details</h3>

Grade: High School

Subject: Physics

Chapter: Vectors

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate , Vector , Scalar

7 0

3 years ago

A hot metal ball is hung in an oven that is maintained at 700 K; and it cools. When the temperature of the ball is 950 K, it is

rjkz [21]

Answer:

The ball will lose heat at the rate of 0.072 J/min.

Explanation:

According to the Newton's cooling law, the rate of cooling R is given by the formula.

R=-k(T-To)

where k is a constant, T is the temperature of the object and To is the temperature of the surrounding.

Initially, R=0.15 J/min, To=700 K and T=950 K.

So 0.15=-k(950-700)

k=-0.15/250 J/K min.

Finally, To=700 K and T=820 K

R=-(-0.15/250)(820-700)

R= 0.072 J/min

Know more about Newton's cooling law.

brainly.com/question/14513140

#SPJ10

3 0

2 years ago

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The Earth is approximately 150 million kilometers away from the Sun. If light travels at a speed of approximately 300,000 kilome

evablogger [386]

The correct answer to the question is 8.33 minutes.

CALCULATION:

The distance of earth from sun s = 150 million km.

We know one million = 10 lakh = $10^6$

Also 1 km = $10^3\ m$

Hence, the distance s = $150\times 10^6\times 10^3\ m$

= $15\times 10^{10}\ m$

The speed of light c = 300,000 km per second

= $3\times 10^8\ m/s$

We are asked to calculate the time.

The time of the reaching earth is calculated as -

$time=\ \frac{distance}{velocity}$

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

$=\ \frac{15\times 10^{10}} {3\times 10^8}\ second$

$=\ 500\ seconds$

We know one minute = 60 second.

Hence, 500 seconds = $\frac{500}{60}\ minute$

= $8.33\ minute$ [ans]

4 0

3 years ago

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A. Some materials exhibit the property of superconductivity under certain conditions.

Vlada [557]

Answer:

Conditions for Superconductivity

The material must be cooled below a characteristic temperature, known as its superconducting transition or critical temperature (Tc). ... The magnetic field to which the material is exposed must be below a characteristic value known as the critical magnetic field (Hc).

7 0

3 years ago

1 Which requires more work, lifting a 10kg sack of coal or lifting a 15kg bag of feathers?