All categories

3 years ago

If you see a crosswalk signal flashing, you should look out for:

Physics

2 answers:

Andrei [34K]3 years ago

7 0

C. Pedestrians yielding to cross traffic

lorasvet [3.4K]3 years ago

5 0

C.) Pedestrians yielding to cross traffic.

You might be interested in

Select the choice that best completes the following sentence. Simple machines A. reduce the amount of energy needed to do work.

boyakko [2]

It is actually are tools that make work easier C because i just had it on study island

7 0

3 years ago

Read 2 more answers

I SERIOUSLY can't do this type of questions so can someone solve it detailedly and putting with letters (there is a system you n

KatRina [158]

Answer:

4 Ohms

Explanation

(This is seriously not as hard as it looks :)

You only need two types of calculations:

replace two resistances, say, R1 and R2, connected in a series by a single one R. In this case the new R is a sum of the two: $R = R_1+R_2$
replace two resistances that are connected in parallel. In that case: $\frac{1}{R}= \frac{1}{R_1}+\frac{1}{R_2}\\\mbox{or}\\R= \frac{R_1\cdot R_2}{R_1+R_2}$

I am attaching a drawing showing the process of stepwise replacement of two resistances at a time (am using rectangles to represent a resistance). The left-most image shows the starting point, just a little bit "warped" to see it better. The two resistances (6 Ohm next to each other) are in parallel and are replaced by a single resistance (3 Ohm, see formula above) in the top middle image. Next, the two resistances (9 and 3 Ohm) are nicely in series, so they can be replaced by their sum, which is what happened going to the top right image. Finally we have two resistances in parallel and they can be replaced by a single, final, resistance as shown in the bottom right image. That (4 Ohms) is the <em>equivalent resistance</em> of the original circuit.

Using these two transformations you will be able to solve step by step any problem like this, no matter how complex.

5 0

3 years ago

W=4j, d=2m,and F=10N find cosine

ruslelena [56]

Correct your answer to the amount of significant figures the questions wants

4 0

3 years ago

Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts

tangare [24]

Answer:

Value of acceleration in each case is $7.52\ m/s^2 \ and \ 7.14\ m/s^2.$

Explanation:

According to newton's law :

$F_{net} = ma$ ...equation 1.

In the given case, $F_{net}=$ Force by both the children - Friction force .

$F_{net} = (75+95)-12=158\ N.$

Putting value of F in equation 1.

$a=\dfrac{F_{net}}{m}=\dfrac{158}{21}=7.52\ m/s^2.$

Now, if friction force = 20 N.

Therefore, $F_{net}=(75+95)-20=150\ N.$

Putting value of F and a in equation 1.

$a=\dfrac{F_{net}}{m}=\dfrac{150}{21}=7.14\ m/s^2.$

Hence , this is the required solution.

8 0

3 years ago

A circular sector has an area of 64 in. squared. The radius of the circle is 8 in. What is the arc length of the sector?

Rom4ik [11]

Answer:

L = 16 [in]

Explanation:

In order to find the arch we must first find the angle that forms the circular sector, using the following formula:

$A = \frac{\alpha*r^{2} }{2} \\where:\\A= area = 64[in^{2}]\\r = radius = 8[in]\\\\\alpha = angle[rad]therefore\\\alpha =\frac{2*A}{r^{2} } \\\alpha =\frac{2*64}{8^{2} } \\\alpha =2[rad]$

Now using the following equation we can calculate the arc length

$L=\alpha *r\\L=2*8\\L=16[in]$

5 0

3 years ago