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2 years ago

PLEASE HELPPPPPPPPPPPP

Physics

2 answers:

zzz [600]2 years ago

8 0

5000 / 500 gives 10, it isn't B because B doesn't have any units so it would be D

bogdanovich [222]2 years ago

4 0

Okay, so we know speed here denoted by s = distance(d) by time taken(t)
Substituting the values, we get s= 5000m/500 sec
5000/500= 10 and the units are m/sec
It’s option d since b does not have UNITS!

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Choose the scientific notation that best represents the standard notation given. 6,840,000,000 m 68.4 x 108 m 6.84 x 108 m 6.84

faust18 [17]

ANSWER

$6.84\times 10^9$

EXPLANATION.

To write in scientific notation means , we write in form,

$k\times 10^n$

Where n is an integer and

$1\le k\:$

The given number is,

$6,840,000,000$

We move the decimal point backward to obtain our k, the n here is 9, because we moved backward 9 times.

This implies that,

$6,840,000,000=6.84\times 10^9$

The correct answer is D

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2 years ago

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It is cold and dry outside. You go down the slide and experience a small electric shock. What charge must you and slide be in or

ruslelena [56]

Answer:

Explanation:

the charge wants to ultimately balance out so either you or the slide gave the other electrons to balance the charges

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3 years ago

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A major league baseball has a mass of 0.145 kg.

galben [10]

The momentum of the ball when it hits the ground is 4.89 kg.m/s.

The given parameters;

mass of the baseball, m = 0.145 kg
height of fall of the ball, h = 58 m

The final velocity of the ball when it hits the ground is calculated as follows;

$v_f ^2 = v_0^2 + 2gh\\\\v_f^2 = 0 + 2gh\\\\v_f^2 = 2gh\\\\v_f = \sqrt{2gh} \\\\v_f = \sqrt{2\times 9.8 \times 58}\\\\v_f = 33.72 \ m/s$

The momentum of the ball when it hits the ground is calculated as follows;

P = mv

P = 0.145 x 33.72

P = 4.89 kg.m/s

Thus, the momentum of the ball when it hits the ground is 4.89 kg.m/s.

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2 years ago

The formula used to find force is F=m*v. true or false

zepelin [54]

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4 0

2 years ago

A football player kicks a football downfield. The height of the football increases until it reaches a maximum height of 15 yards

Trava [24]

Answer:

kick 1 has travelled 15 + 15 = 30 yards before hitting the ground

so kick 2 travels 25 + 25 = 50 yards before hitting the ground

first kick reached 8 yards and 2nd kick reached 20 yards

Explanation:

1st kick travelled 15 yards to reach maximum height of 8 yards

so, it has travelled 15 + 15 = 30 yards before hitting the ground

2nd kick is given by the equation

y (x) = -0.032x(x - 50)

$Y = 1.6 X - 0.032x^2$

we know that maximum height occurs is given as

$x = -\frac{b}{2a}$

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and maximum height is

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so kick 2 travels 25 + 25 = 50 yards before hitting the ground

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8 0

3 years ago

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