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3 years ago

A runner covers onelap of a circular track 40.0m in diameter in 64.0s .

Physics

1 answer:

Alekssandra [29.7K]3 years ago

4 0

Answer:

(A) 0.625 m /sec

(B) 0 m /sec

(d) 0.692 m /sec

Explanation:

We have given that a runner covers one lap of track which is 40 m in length in 64 sec

(a) Average speed will be equal to ratio of distance traveled and time taken

So average speed $v=\frac{s}{t}=\frac{40}{64}=0.625m/sec$

(B) Average velocity is the ratio of displacement and time taken

As he completed one lap means comes to his initial position

So displacement will be zero

So average velocity $v=\frac{0}{64}=0m/sec$

So average speed $v=\frac{s}{t}=\frac{20}{28.9}=0.6920m/sec$

(D) For half lap displacement will be equal to distance traveled

So average velocity will be equal to v=\frac{s}{t}=\frac{20}{28.9}=0.6920m/sec

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If the pressure of a substance is increased during a boiling process, will the temperature also increase, or will it remain cons

7nadin3 [17]

Answer:

on increasing pressure, temperature will also increase.

Explanation:

Considering the ideal gas equation as:

$PV=nRT$

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

Thus, at constant volume and number of moles, Pressure of the gas is directly proportional to the temperature of the gas.

P ∝ T

Also,

Also, using Gay-Lussac's law,

$\frac {P_1}{T_1}=\frac {P_2}{T_2}$

Thus, on increasing pressure, temperature will also increase.

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3 years ago

Which factor affects the amount of runoff that occurs in an area?

jarptica [38.1K]

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4 years ago

When a force of 15 newtons is applied to a stationary chair, it starts moving. What can you say about the frictional force betwe

harkovskaia [24]

First you need to make a difference between friction while object is stationary and the friction while object is moving. Force required to start moving some object is slightly greater than force required to maintain objects movement. That means that to move a chair you need some force F1 but you can than slightly reduce force and chair will still be moving.

Now to the problem in this question: It can be said that "stationary friction force" is equal to 15 Newtons. Its also good to know that friction force between chair and floor while you are increasing your push is also increasing and is equal to force of your push. Once it reaches 15N which is it "critical value" for that chair, chair starts moving and friction force drops a little bit and now it is called friction force of moving chair.

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3 years ago

PLEASE HELP !

pochemuha

HOPE IT HELPS LET ME KNOW IF U NEED EXPLANATION

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3 years ago

What is the empirical formula of a compound that contains 27.0% s

eduard

Answer:

Empirical formula of the compound = SOCl₂

Explanation:

QUESTION:What is the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass?

The empirical formula of a compound is its simplest formula. It tells us

* The component element present in a molecule of the compound.

* The ratio in which these elements are combined together, i.e mole ratio.

To calculate the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass. ( Relative atomic mass of S=32gmol⁻¹, 0=16gmol⁻¹, Cl=35.5gmol⁻¹)

Sulphure S, Oxygen O, Chlorine Cl

percentage by mass: 27.0% 13.4% 59.6%

Step 1:

Divide by their relative

atomic mass: 27.0/32.0 13.4/16.0 59.6/35.5

⇒⇒⇒⇒⇒⇒⇒⇒⇒ 0.844 0.838 1.679

Step 2:

Divide by the

smallest mole ratio: 0.844/0.838 0.838/0.838 1.679/0.838

∴ 1 : 1 : 2.

from the analysis above, the compound contains Sulphur, Oxygen and Chlorine in the ratio of 1:1:2.

∴ Empirical formula of the compound = SOCl₂

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3 years ago