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4 years ago

The distance versus time graph for Object A and Object B are shown. Which object moves with changing speed?

Physics

1 answer:

Nadya [2.5K]4 years ago

6 0

Answer:

<em>Both: Object A and Object B, because different distances are traveled in the same time interval</em>

Explanation:

<u>Constant Speed Motion </u>

An object is said to have constant speed it travels same distances at the same time intervals. For example, an object who travels 4 meters in 2 seconds has a constant speed if it also travels 6 meters in 3 seconds and 10 meters in 5 seconds. The constant speed is 2 m/s.

We can see in the image provided two graphs of distance vs time of two objects. If they were traveling at a constant speed, that graph should be a single line (increasing, decreasing of horizontal). None of the graphs show a line, which indicates the object some times travels more or less distance in a given time interval than in other equal time intervals. Thus, the answer is the last option:

Both: Object A and Object B, because different distances are traveled in the same time interval

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3 years ago

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A student whirls a rubber stopper attached to a string in a horizontal circle above her head. If the radius of the stopper in ci

algol13

Answer:

$v = 12.57 m/s$

Explanation:

As we know that the radius of the circular motion is given as

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time period of the motion is given as

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now we know that it is moving with uniform speed

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3 years ago

Given that two vectors A = 5i-7j-3k, B = -4i+4j-8k find A×B

WARRIOR [948]

$\textbf{A}×\textbf{B}= 68\hat{\textbf{i}} + 52\hat{\textbf{j}} - 8\hat{\textbf{k}}$

Explanation:

Given:

$\textbf{A} = 5\hat{\textbf{i}} - 7\hat{\textbf{j}} - 3\hat{\textbf{k}}$

$\textbf{B} = -4\hat{\textbf{i}} + 4\hat{\textbf{j}} - 8\hat{\textbf{k}}$

The cross product $\textbf{A}×\textbf{B}$ is given by

$\textbf{A}×\textbf{B} = \left|\begin{array}{ccc}\hat{\textbf{i}} & \hat{\textbf{j}} & \hat{\textbf{k}} \\\:\:5 & -7 & -3 \\ -4 & \:\:4 & -8 \\ \end{array}\right|$

$= \left|\begin{array}{cc}-7 & -3\\\:4 & -8\\ \end{array}\right|\:\hat{\textbf{i}}\:+\:\left|\begin{array}{cc}-3 & \:\:5\\-8 & -4\\ \end{array}\right|\:\hat{\textbf{j}}\:+\: \left|\begin{array}{cc}\:\:5 & -7\\-4 & \:\:4\\ \end{array}\right|\:\hat{\textbf{k}}$

$= 68\hat{\textbf{i}} + 52\hat{\textbf{j}} - 8\hat{\textbf{k}}$

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3 years ago

Your electricity bill says 834-kWh of consumption. With this amount of energy, how many 59-W light bulbs can be powered for an a

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Answer:

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Explanation:

So the electrical energy consumed by each 59-W light bulb within 7 hours is the product of the power and time duration

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If each light bulb consumes 0.413 kWh, then the total number of light bulbs needed to consume 834 kWh would be

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4 years ago

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podryga [215]

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3 years ago