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lara [203]
3 years ago
15

In a shopping mall, two elevators pass each other moving in opposite directions. Each elevator is moving at the same speed. The

relative velocity of one elevator to the other is 10 m/s. What is the velocity of each elevator relative to a person standing on the ground?

Mathematics
2 answers:
STALIN [3.7K]3 years ago
6 0

Problem 5

Say Up is positive. When the up elevator sees the separation increasing at a speed of 10 m/s it means that you have +5 - - 5 true to the observer below. He sees each of them moving at the same speed away from one another. Answer A.

Problem 6

6 looks right to me. A timer would be the second best answer but it starts at 0. Answer C

Problem 7

It can't be zero. Nothing would get anywhere if it was zero. When you look up and see a plane, isn't it going in the direction you think it's going? It can't appear to be going west. That would take it to Vietnam or Melbourne. It must be flying east when seen flying from ground level and since we are not asked to consider air resistance or the earth's rotation, the answer must be D.

Problem 8

I'll go with your definition.

Problem 9

It's moving forward as well, just not as quickly. 126 - 68 = 58 m/s if 126 is taken as positive. Answer D

Nata [24]3 years ago
5 0
Since both have same speed
v(rel.) x-(-x)= 10( from law of vector addition)
2x=10,x= 5m/sec
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mina [271]

Answer:

No, Mia is not correct, the answer is -2.

Step-by-step explanation:

First we are going to use the distributive Property.

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We get 1.5m+.8, so 2(0.75+0.4)=1.5m+.8

Now we are going to distribute on the oher side. 4(.5m-.8)

4x .5m=2m and 4x.8=3.2. Keep the sign the same and we get 2m-3.2, so 4(.5m-.8)=2m-3.2

We put this into the new equation to get 1.5m+.8+7.8=-6.4m+2m-3.2

Step 2: combine like terms

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Plug that into our equation and we get 1.5mn+8.6=-4.4m-3.2

Step 3: Switch the sides

Bring -4.4m to the other side to get 1.5m+4.4m=5.9m

One side is 5.9m

We bring 8.6 to the other side to get -8.6. now we do -3.2-8.6=-11.8.

Our new equation is 5.9m=-11.8

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6 0
3 years ago
Read 2 more answers
The school cafeteria sells three different types of sandwiches: chicken, turkey,
dusya [7]

Answer:

Number of chicken sandwiches = 150

Number of turkey sandwiches = 150

Number of roast beef sandwiches= 100

Step-by-step explanation:

We are told the school cafeteriat makes and sells 3 different types of sandwiches which are; chicken, turkey and roast beef.

Let chicken be x, turkey be y and roast beef be z.

We are told they make 400 sandwiches in total.

Thus;

x + y + z = 400

However, we are told that the cafeteria makes same number of chicken and turkey sandwiches.

Thus, x = y

Thus;

Total is now;

x + x + z = 400

2x + z = 400 - - - (eq 1)

Now,we are told that chicken, turkey and roast beef sandwiches are sold for $3, $3.5 and $4 respectively. Also that the total amount realized from sales is $1375.

Thus;

3x + 3.5y + 4z = 1375

Since x = y. Thus;

3x + 3.5x + 4z = 1375

6.5x + 4z = 1375 - - - (eq 2)

Let's make z the subject in eq 1.

Thus;

z = 400 - 2x - - - (eq 3)

Putting 400 - 2x for z in eq(2) gives us;

6.5x + 4(400 - 2x) = 1375

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225 = 1.5x

x = 225/1.5

x = 150

Putting 150 for x in eq 3 gives;

z = 400 - 2(150)

z = 400 - 300

z = 100

Since x = y. Then y = 150

4 0
3 years ago
There are a total of 20 cubes in a box. There are 8 red cubes, 6 green cubes, 4 orange cubes, and 2 yellow cubes. What is the pr
natita [175]
Green = 6
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8/20 can be simplified to 2/5
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1 year ago
Simplify the folllowing: (xy^3 z^4)
allsm [11]

Answer:

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4Step-by-step explanation:

3 0
2 years ago
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Valentin [98]

Answer:

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