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Harrizon [31]
3 years ago
9

Classwork Let's tick (V) the correct answer.

Mathematics
1 answer:
Fynjy0 [20]3 years ago
6 0

Answer:

Option i

Step-by-step explanation:

The given expression is , 5x² - 3xy .

We can clearly see that there are two terms in the expression , 5x² and 3xy .

<u>T</u><u>herefore </u><u>option </u><u>(</u><u>i)</u><u> </u><u>is </u><u>correct</u><u> </u><u>.</u>

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Please answer these questions!!!!!! Fast!!!!!!
vodka [1.7K]

Answer:

For an object of mass M and velocity V, the kinetic energy is written as:

K = (M/2)*V^2

And also remember that:

1 J = 1 kg*m/s

a) we know that:

Mass = M = 0.7 kg

Velocity = V = 60 m/s

Then the kinetic energy is:

K = (0.7kg/2)*(60m/s)^2 = 1,260 J

b) We know that in a closed system, the energy is conserved.

This means that if we hit an object with an energy E, the maximum energy that we can give to that object is E.

Then if we have a bat of mass M = 2kg, and velocity V = 30m/s

The kinetic energy of the bat (before hitting the ball) is:

K = (2kg/2)*(30m/s)^2 = 900 J

Obviously, this will never happen, because after we hit the ball the bat keeps moving for a bit, meaning that it still has some kinetic energy and it did not transfer all of the kinetic energy to the ball. But we can not have a more precise estimation, because we do not know the mass of the ball and a lot of other needed information, so we can conclude that, the theoretical maximum energy that could be given to the ball, is 900 J.

c) Here we have:

Mass = M = 1950 kg

Velocity = V = 10 m/s

then the energy is:

K = (1950kg/2)*(10 m/s)^2 = 97,500 J.

d) Notice that in the equation of the kinetic energy we have the velocity squared, which means that the contribution of the velocity is larger than the contribution of the mass.

Then the option with the largest velocity most likely would have the largest kinetic energy, then the correct option is the second counting from the top, with a kinetic energy equal to:

K = (0.25 kg/2)*(50m/s)^2 = 312.5 J.

5 0
3 years ago
Two nimbers have a product of 90 and a sum of 19. What are the two numbers?​
bulgar [2K]

Answer:

9 + 10 = 19 product is 9 x 10 = 90 9^2 + 10^2 = 181

6 0
2 years ago
What is the solution to the equation x/-3=4? <br> A)x=-7 B)x=-4/3 C) x=-1 D)x=-12
pav-90 [236]

d) x=-12 because x/-3=4 can be rearranged as x=4x-3 so x=-12

7 0
3 years ago
the cost of renting a scooter is represented by 3j+5. Write and simplify an expression that represents the cost of renting 6 sco
wariber [46]

Simplified expression that represents the cost of renting 6 scooters is 18 j +30

<u>Step-by-step explanation:</u>

Given data:

The cost of renting of a scooter is represented by 3j +5

So, from that, we can say in general,

The cost of renting of n scooters is represented by  

                                 n \times(3 j+5)

But according to given, the value of n is 6. i.e. to find the cost for six number of scooters. We can calculate now as follows

So, the cost of renting of a scooter is represented by  

                                 6 \times(3 j+5)=18 j+30

3 0
3 years ago
Help me pleaseeeeeeeee
Mashutka [201]

Answer:

The answer is 7

Step-by-step explanation:

25 times 25=625

24 time 24=576

625-576=7

And the square root of 49 is 7.

4 0
2 years ago
Read 2 more answers
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