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3 years ago

Jane finished a race in 7 minutes. How many seconds is this.

Mathematics

2 answers:

Serggg [28]3 years ago

7 0

Answer:

420 seconds

Step-by-step explanation:

(60 seconds in a minute, 60 x 7 = 420)

#Nova

Murljashka [212]3 years ago

4 0

Answer:

420 seconds

Step-by-step explanation:

There are 60 seconds in a minute, since there are 7 minutes, all we need to do is multiply the minutes by seconds.

60 × 7 = 420

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A fair ordinary dice is thrown once.<br> Select the probability of getting a 4 or a 5?

dusya [7]

There are 6 numbers on a dice 1,2,3,4,5,6. If you want to get a 4 or a 5, that would be 2 numbers out of the total number of numbers There 6 numbers in total so the probability of getting a 4 or 5 is 2 out of 6 or 1 out of 3 or 1/3

6 0

4 years ago

True or False (& Justify): If a ball is thrown horizontally from the top edge of a 150m building at a speed of 25 m/sec, the

kap26 [50]

Answer:

38.6 m/s

Step-by-step explanation:

The motion of the ball is a projectile motion, which consists of two independent motions:

- A uniform motion (constant velocity) along the horizontal direction

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction

Therefore we have to analyze the horizontal and vertical motion separately.

Along the horizontal direction, the velocity is constant during the motion, since there are no forces acting in this direction. So the horizontal velocity 3 seconds after the launch will be the same as the velocity at the launch:

$v_x = v_0 = 25 m/s$

The vertical velocity instead changes according to the suvat equation:

$v_y = u_y - gt$

where

$u_y=0$ is the initial vertical velocity

$g=9.8 m/s^2$ is the acceleration due to gravity

t is the time

Therefore, after t = 3 s,

$v_y=0-(9.8)(3)=-29.4 m/s$

So the velocity after 3 seconds is < 25, -29.4 > m/s. The magnitude of the velocity is

$v=\sqrt{v_x^2+v_y^2}=\sqrt{25^2+(-29.4)^2}=38.6 m/s$

3 0

4 years ago

Help please thank you

Ad libitum [116K]

In order for the triangle to be isosceles, we have to set two lengths of the triangle equal to each other.

Let's take the lengths 5x-12 and x+20 and set them equal to each other.

5x - 12 = x + 20

Combine like terms by moving them over to their respective sides.

Subtract x from both sides of the equation.

4x - 12 = 20

Add 12 to both sides of the equation.

4x = 32

Divide both sides by 4.

x = 8

Check your answer by substituting.

5x - 12 = x + 20

5(8) - 12 = 8 + 20

40 - 12 = 28

28 = 28

Solution: x = 8

5 0

4 years ago

15 POINTS Help me out ASAP

laila [671]

It’s 1,195,742,250,000,000/5,832

5 0

3 years ago

Please answer asap!!!

antiseptic1488 [7]

Answer:

The airplane reaches its maximum height of 74 feet in 14 seconds.

Step-by-step explanation:

The easiest thing to do here is to plug in the two numbers given in the answer choices. Finding the height at 14 seconds and the height after 74 seconds is straightforward from here.

h (14) = -(14-14)²+ 74

h (14) = 0 + 74

h (14) = 74

h (74) = -(74-14)² + 74

h (74) = -(60)² + 74

h (74) = -3600 + 74

h (74) = -3,526

Now, we know that a height of an airplane won't be negative, as the height below the ground cannot be reached.

because our equation includes -(t-14)², any number greater than 14 will be a larger negative than 0--setting the height to an impossible number.

{However, we add +74 feet, so our t-14 could be any number that is less than 74 when squared (after first subtracting 14 from the number). Numbers like 15, (resulting in subtracting 1 from 74), 16 (resulting in -4 from 74), 17 (74-9), 18 (74-16), 19 (74-25), 20 (74-36), 21 (74-49), 22 (74-64) are still above the minimum input}

{So, our t could be up to 22, and any number above this maximum limit, such as 23, result in a height of 0}

for example: -(23-14)² + 74

-(9)² = -81

-81 + 74 = -7

All numbers below 14, which would end in an eventual negative outcome [ -(x)² = negative if x < 0 ]

are greater than a t of 14.

-(13-14)² = -1

; showing that t = 14 is our maximum height

(remember that if you have -(x)² you get the negative version of x² [pemdas. the negative outside of the parenthesis is equivalent to multiplying the parenthesis by -1. (E)xponents comes before (M)ultiplication].)

6 0

2 years ago