If you had thrown the pennies down from the observation deck 321m above street level at an initial velocity of 1.99m/s, determine their speed as they reach the ground.

Answers

Answer 1

Answer:

Answer: 79.3 m/s

Explanation: Use the equation V^2-Vo^2=2a(ΔY)

We know that the initial velocity is 1.99 m/s, so that is our Vo. We also are given that the height of the deck is 321, so therefore, our delta y is 321. Finally, our acceleration is 9.81 m/s^2 since that is the acceleration of gravity during free fall. We are solving for the final velocity (V)

So, our equation is V^2-(1.99^2)=2(9.8)(321)

Next, V^2-(3.96)=6291.6

V^2=6295.56

Take the square root of both sides, and V=79.3 m/s

Answer 2

Answer:

Answer:79.3 m/s

Explanation:

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A soccer player kicks a ball with a speed of 30 m/s at an angle of 10. How long does the ball stay in the air?

Tony walks at an average speed of 70 m/min from his home toschool. If the distance between his home and the school is
2100 m, how much time does it take for Tony to walk to
school?
min

Answers

Answer:

The answer is 30 min

Explanation:

t = s/v

v = 70 m/min, s = 2100 m

t = 2100/70 = 30 min.

Hope it helps you! ＼(^ᴥ^)／

Aiden takes 0.10s to throw a baseball, which leaves his hand with a velocity of 49m/s. The balls acceleration is

Answers

Since the ball was not moving before it let Aiden's hand, the formula used to calculate the acceleration is
$a = (v)/(t)$
, where a is acceleration, v is velocity and t is the time. We put them in the formula and get
$a = (49)/(0.1) \n a = (490)/(1) \n a = 490$
The acceleration is 490 m/s^2

Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down from the edge, but Alice takes a running start and jumps with an initial horizontal velocity of 25 m/s. Neither person experiences any significant air resistance. Just as they reach the lake below.A) Alice reaches the surface the lake first. B) Tom of reaches the surface of the first. C) Alice and Tom will reach the surface of the lake at the same time. D) Information is not enough

Answers

Answer:c

Explanation:

Given

Alice launches with horizontal velocity $u=25\ m/s$

Tom simply drops straight down from the edge

Time taken by both the person is same as they have same initial vertical velocity i.e. zero so the time taken to reach the ground is zero.

Although Alice will travel more horizontal distance compared to Tom.

Thus option c is correct

The molecular formula for phosphorous pentoxide is p4o10. What is its empirical formula?

Answers

Answer: P2O5

Explanation:

Final answer:

The empirical formula for phosphorous pentoxide is P2O5.

Explanation:

The empirical formula for phosphorous pentoxide is P2O5.

To find the empirical formula, we need to determine the ratio of atoms in the compound.

Since the molecular formula of phosphorous pentoxide is P4O10, we divide the subscripts by their greatest common divisor (gcd) to get P2O5 as the empirical formula.

Learn more about empirical formula here:

brainly.com/question/32125056

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Which of the following statements is not true regarding atmospheric pressure?

Answers

Answer:

Atmospheric pressure increases with increasing altitude

Explanation:

Atmospheric pressure decreases with increasing height (altitude).

Ideally, there are no options given here with which the question can be answered, however after searching the question on google, a similar question popped up on two websites with the same set of options. doubnut.com and weegy.com and the options are;

A. Mercury and aneroid barometers are used to measure atmospheric pressure.

B. You calculate absolute pressure by adding atmospheric pressure to gauge pressure.

C. Atmospheric pressure increases with increasing altitude.

D. When atmospheric pressure is higher than the absolute pressure of a gas in a container, a partial vacuum exists in the container

When atmospheric pressure is higher than the absolute pressure of a gas in a container.

Continental crust is primarily witch kind of rock

Answers

The correct answer is granite oceanic. Continental crust is primarily a granite oceanic. Continental crust is the layers of sedimentary, igneous, and metamorphic rocks that form the area of the shallow seabed that is near the shore.

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