a stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge

Answers

Answer 1

Answer: The height of a falling object, h, in terms of the seconds passed, t, is
h = 0.5(-9.8t^2) + v_0t + h_0
0 = -4.9(8)^2 + 0 + h_0
h_0 = 64 * 4.9
= 313.6 meters

Answer 2

Answer:
Here's a formula that tells the distance covered by an
accelerating object starting from rest. The formula is
very useful, and it's simple enough to memorize:

   Distance = (1/2) (acceleration) (time squared) .

If the object is falling, then the acceleration is gravity, 9.8 m/s²,
and the distance is

   (4.9) (time²) .

In this question,

   D = (4.9) (8²)

   = (4.9 x 64) = 313.6 meters.

Coupla comments:

-- This calculation ignores air resistance.
    We kind of ALWAYS do that, otherwise
    the calculation would be very complicated,
and would need a lot of other numbers
    that we don't know, like the size and shape
    of the falling object, and the density of the air.

-- This is a very big building ... about 1,029 feet.
   In New York City, the Chrysler building and
   the New York Times building are both only
   15 feet taller than that.

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A pet turtle moves 30.1 mm in 72s. how slow is it moving? is this a speed or a velocity?

Answers

The pet turtle is moving at a certain speed, and to determine how slow it's moving, we can calculate its speed.

Speed is a scalar quantity, which means it only has magnitude and no direction. Velocity, on the other hand, is a vector quantity and includes both magnitude and direction.

To calculate the speed of the turtle, you can use the formula for speed:

Speed (S) = Distance (D) / Time (T)

In this case, the turtle moves 30.1 mm in 72 seconds:

S = 30.1 mm / 72 s

To make the units more convenient, we can convert millimeters to meters (1 meter = 1000 millimeters):

S = (30.1 mm / 1000) m / 72 s

S ≈ 0.000301 m / 72 s

Now, let's calculate the speed:

S ≈ 0.00000418056 m/s

So, the pet turtle is moving at a speed of approximately 0.00000418056 meters per second.

It's important to note that this is indeed a speed, not a velocity, because it only provides the magnitude of the motion (how fast it's moving) without specifying a direction.

Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag?

Answers

Answer;

18 Joules

Explanation;

Work is the measures the transfer of energy when an object moves over a given distance.

Work is therefore given by; Force × distance

Force =36 Newtons

Distance = 0.5 meters

Hence; work = 36 N × 0.5 N

= 18 Joules

the answer is 18 joules hope this helps

A DUI conviction not only affects the driver involved but also his or her ___________A. friends.
b. family.
c. Both A and B

Answers

Answer: option C

Explanation:

A DUI (driving while under the influence of alcohol or drugs) conviction means that a person has been found guilty, of either DUI or has been found guilty of driving with a 0.8% or more blood alcohol concentration. If a person is found guilty, the DUI conviction will remain on record of driving for 75 years. A DUI conviction not only affects the driver and his/her personal relationships. Conviction can also lead to imprisonment, which will also have a negative effect on family and friends.

Your answer would be both A and B, so c.

Why can't alpha particles penetrate deeply into solids? Alpha particles have low mass. Alpha particles have high mass. Alpha particles have low velocity. Alpha particles have high velocity.

Answers

Alpha particles have both high mass and low velocity, but it would be the former that determines why they can't penetrate. An alpha particle is made of two protons and two neutrons, which is quite a large mass for a particle. This large mass keeps it from penetrating too deeply into anything, since it will essentially "get stuck" when it comes too near to another atom.
So the answer, I believe, is B. Alpha particles have high mass.

The answer is the Alpha Particles have low velocity

The figure shows a velocity-versus-time graph for a particle moving along the x-axis. At t=0s, assume that x=0m. What is the particle's position at t=3.0s?

Answers

distance = area under graph v-t
area = 4x2 + 1x(2+4)/2 = 11
at 3s, particle is at 11m

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