You drop a rock down a well that is 5.4 m deep. How long does it take the rock to hit the bottom of the well?

Answers

Answer 1

Answer: Equation of motion:

$y_(f)=y_(o)+v_(o)t+ (1)/(2) at^(2)$

Since initial velocity is zero, the second term goes away:

$y_(f)=y_(o)+0+ (1)/(2) at^(2)$

$y_(f)=y_(o)+(1)/(2) at^(2)$

$y_(f)-y_(o)= (1)/(2) at^(2)$

$y_(f)-y_(o)=5.4m$

$5.4m= (1)/(2) at^(2)$

$(2(5.4m) )/(a) = t^(2)$

$a = g = 9.81 (m)/( s^(2))$

$(2(5.4m) )/(9.81 (m)/( s^(2) ) ) = t^(2)$

$1.1 s^(2) = t^(2)$ $\sqrt{1.1 s^(2)} = \sqrt{t^(2)}$

$t = 1.05s$

Answer 2

Answer:

Answer:

1.05 s

Explanation:

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A forklift raises a crate weighing 8.35 × 102 newtons to a height of 6.0 meters. What amount of work does the forklift do?

Answers

You are almost there, often you are given a mass. But, here you already have a force. You just need to use:W=FdWhere W is work done, F is force, d is distance. Units of work will be Nm

Answer:

You just need to use:W=Fd Where W is work done, F is force, d is distance. Units of work will be Nm

Explanation:

A police car is traveling at a velocity of 18.0 m/s due north, when a car zooms by at a constant velocity of 42.0 m/s due north. After a reaction time of 0.800 s the policeman begins to pursue the speeder with an acceleration of 5.00 m/s2. Including the reaction time, how long does it take for the police car to catch up with the speeder?

Answers

Answer:

t = 10.4 s

Explanation:

given,

velocity of the police car = 18 m/s

reaction time of policeman = 0.8 s

acceleration of the policeman to catch up the speeder = 5 m/s²

time taken to catch the speeder be t₁

distance traveled by the police and the speeder will be same

$D_p = D_s$

$u t_1 + (1)/(2)at_1^2 = u' t_1$

$18* t_1+ 0.5 * 5* t_1^2= 42* t_1$

$2.5 t_1^2 - 24 t_1 = 0$

$(2.5 t_1 - 24)t_1 = 0$

$t_1 = (24)/(2.5)$

t₁ = 9.6 s

total time taken by the policeman

= reaction time + t₁

= 0.8 + 9.6

t = 10.4 s

Total time taken by the policeman to catch the speeder is 10.4 s

A book is resting on a table. The table is raised on one end to an angle of 15° to the floor. If the book remains at rest, what keeps the book from sliding

Answers

Answer:

Static Friction is acting upon the book

What characteristics makes a substance a mineral?A. It is hard
B. It is organic
C. Its structure is crystal
D. Its a liquid, solid, or gas

Answers

Answer:c-its structure is crystal

Explanation:

A substance is called a mineral if it meets the following requirement

naturally occurring,

inorganic,

solid,

definite chemical composition,

ordered internal structure

So the definite answer is crystal structure because they have an ordered internal structure.

Hope it helps

Final answer:

A mineral is a naturally occurring, inorganic, solid substance with a specific chemical composition and a crystalline structure. Hardness may vary among minerals and they are not organic. They are solid under normal conditions on Earth.

Explanation:

A mineral is defined by several specific characteristics: it is naturally occurring, inorganic, solid, has a definite chemical composition, and has a ordered internal arrangement of atoms - structure typically crystalline in nature.

It is hard: Not all minerals are hard. The hardness of a mineral is determined by the Mohs scale. So, hardness is a characteristic but not a definition.
It is organic: This statement is untrue. Minerals are inorganic substances.
Its structure is crystal: This is true. Minerals have a crystalline structure due to the orderly, repeating pattern of their atoms.
It's a liquid, solid, or gas: This is partly correct. Minerals are solids under normal conditions on Earth.

Learn more about Mineral here:

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Kuiper Belt objects are composed of which substances? Select all that apply.A. Iron
B. Silicon
C. Water
D. Methane
E. Ammonia

Answers

IM sure there is C, D, and E in kuiper belts, but not really sure of silicon and iron

a cylinder of mass 34.5 kg rolls without slipping on a horizontal surface. At a certain instant, its center of mass has a speed 9.5 m/s. Determine the rotational kinetic energy