Numerade

Questions asked

INSTANT ANSWER

If 0.25 kg of water at 90.0°C is added to 0.35 kg of water at 20.0°C in an aluminum calorimeter with an inner cylinder of mass 0.100 kg. Find the final temperature of the mixture

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INSTANT ANSWER

Consider the following diagram that shows three negative point charges of equal size \( -q \). Which arrow \( (A, B, C \) or \( D) \) represents the correct direction of the net electric field? Select one: A. A B. B C. C D. D E. The field is equal to zero at point \( P \)

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ANSWERED

Vipender Yadav

Numerade educator

Consider the following diagram that shows three negative point charges of equal size ( -q ). Which arrow ( (A, B, C ) or ( D) ) represents the correct direction of the net electric field? Select one: A. A B. B C. C D. D E. The field is equal to zero at point ( P )

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ANSWERED

Vipender Yadav

Numerade educator

The amount of latent heat that is required to melt the substance is equal to the amount of latent heat required to freeze the substance. True or false

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ANSWERED

Vipender Yadav

Numerade educator

Consider the following schematic diagram that shows Q1 = 3C and Q2 = -3C . Which arrow (A,B, C or D) represents the net electric field at point P due to these two charges? Select one: A B C D The field is equal to zero at point P.

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ANSWERED

Christopher Dzorkpata

Numerade educator

By using a ray diagram of a convex lens for an object located in front of the lens, the image of the object will be upright, either; virtual or real, located either; behind the lens or in front of the lens. The height of the image can remain the same, or can be also reduced or enlarged

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ANSWERED

Christopher Dzorkpata

Numerade educator

A bowling ball at rest has a temperature of 18°C. The ball is then rolled down a bowling alley. Ignoring the dissipation of energy by friction and drag forces, is the internal energy of the ball higher, lower, or the same as when the ball was at rest? Is the temperature of the ball higher, lower, or the same as when the ball was at rest?

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ANSWERED

Ajay Singhal

Numerade educator

Before starting out on a long drive, you check the air in your tires to make sure they are properly inflated. The pressure gauge reads 31.0 lb/in2 (214 kPa), and the temperature is 15°C. After a few hours of highway driving, you stop and check the pressure again. Now the gauge reads 35.0 lb/in2 (241 kPa). What is the temperature of the air in the tires now?

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ANSWERED

Sanu Kumar

Numerade educator

Consider two point charges. One point charge has a magnitude of +15 ?µC and the other point charge has a magnitude of -5 µC are separated by a distance of 30 cm. What is the magnitude of electric field due to these charges at a point midway between them? In your calculations use k = 9x10? Nm²/C². Select one: 8 × 10? N/C directed toward the negative charge 8 × 10? N/C directed toward the positive charge 8 × 10? N/C directed toward the negative charge 8 × 10? N/C directed toward the negative charge 8 × 10? N/C directed toward the positive charge

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INSTANT ANSWER

Consider two point charges. One point charge has a magnitude of \( +15 \mu \mathrm{C} \) and the other point charge has a magnitude of \( -5 \mu \mathrm{C} \) are separated by a distance of \( 30 \mathrm{~cm} \). What is the magnitude of electric field due to these charges at a point midway between them? In your calculations use \( \mathrm{k}=9 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{C}^{2} \). Select one: \( 8 \times 10^{5} \mathrm{~N} / \mathrm{C} \) directed toward the negative charge \( 8 \times 10^{5} \mathrm{~N} / \mathrm{C} \) directed toward the positive charge \( 8 \times 10^{6} \mathrm{~N} / \mathrm{C} \) directed toward the negative charge \( 8 \times 10^{4} \mathrm{~N} / \mathrm{C} \) directed toward the negative charge \( 8 \times 10^{6} \mathrm{~N} / \mathrm{C} \) directed toward the positive charge

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Moahmed A.