All categories

3 years ago

A rock is dropped from a cliff and hits the ground 6.0 seconds later. How high is the cliff?

Physics

2 answers:

PolarNik [594]3 years ago

6 0

It all depends on the wight of the rock to but each 1 sec is 1 mile so about 6 miles

Lemur [1.5K]3 years ago

5 0

Answer:

The height of the cliff is found to be 176.4 m

Explanation:

Since, the body is being dropped from a certain height and reaches the ground in some time. Thus, we can apply the equations of motion (modified for vertical motion) in this case, due to constant accelerated motion. We have the following data:

Acceleration due to gravity = g = 9.8 m/s²

Time to reach ground = t = 6 sec

Initial Velocity of the Rock = Vi = 0 m/s (Because, the rock will be at rest, initially)

Height of cliff = H = ?

Now, applying second equation of motion (modified for vertical motion), to the rock, between the top of the cliff and ground, we get:

H = Vi t + (1/2)gt²

Using values:

H = (0 m/s)(6 sec) + (1/2)(9.8 m/s²)(6 sec)²

H = 176.4 m

You might be interested in

Through which one of the following mediums is the velocity of a sound wave the greatest?

Colt1911 [192]

Answer: C. Steel

Explanation: When a sound wave travels through a solid body consisting

of an elastic material, the velocity of the wave is relatively

high. For instance, the velocity of a sound wave traveling

through steel (which is almost perfectly elastic) is about

5,060 meters per second. On the other hand, the velocity

of a sound wave traveling through an inelastic solid is

relatively low. So, for example, the velocity of a sound wave

traveling through lead (which is inelastic) is approximately

1,402 meters per second.

6 0

3 years ago

A current exists whenever electric charges move. If ΔQ is the net charge that passes through a surface during a time period Δt,

jeka57 [31]

Answer:

It represents the change in charge Q from time t = a to t = b

Explanation:

As given in the question the current is defined as the derivative of charge.

I(t) = dQ(t)/dt ..... (i)

But if we take the inegral of the equation (i) for the time interval from t=a to

t =b we get

Q =∫_a^b▒〖I(t) 〗 dt

which shows the change in charge Q from time t = a to t = b. Form here we can say that, change in charge is defiend as the integral of current for specific interval of time.

5 0

4 years ago

How do you calculate percentage uncertainties???

ch4aika [34]

I is just the uncertainty over the actual number multiplied by 100.

example:

36.1( +/- 0.1)

The percentage of the uncertainty here is 0.1/36.1x 100=0.3%

5 0

3 years ago

Two resistors are connected in parallel two equivalent resistance is 3,75 ohm if one resistor has a resistance of 10ohm what is

yawa3891 [41]

Answer:

6 Ω

Explanation:

Two resistors in parallel = 3.75 ohm when one is 10 ...

r1 * r2 / (r1+r2) = 3.75

10 r2 / ( 10 + r2 )= 3.75

10 r2 = 37.5 + 3.75r2

6.25 r2 = 37.5

r2 = 6Ω

5 0

2 years ago

A container is formed by revolving the region bounded by the graph of y=x^2, and the x-axis, 0 < x < 2, about the y-axis.

Cerrena [4.2K]

Answer:

Balanced chemical equations only show formulae, not names. A balancing number, written in normal script, multiplies all the atoms in the substance next to it.

3 0

4 years ago