A man standing on top of a 30 m tall building throws a brick downwards with a velocity of 12 m/s. Determine the speed of the brick just before it hits the ground.

Answers

Answer 1

Answer:

27.1m/s

Explanation:

Given parameters:

Height of the building  = 30m

Initial velocity  = 12m/s

Unknown:

Final velocity  = ?

Solution:

We apply one of the kinematics equation to solve this problem:

         v²  = u²  + 2gh

v is the final velocity

u is the initial velocity

g is the acceleration due to gravity

h is the height

          v²   = 12²  + (2 x 9.8 x 30)

          v  = 27.1m/s


Related Questions

Between ball B and ball C, ball ____ has LESS potential energy because ___
a: c;its mass is greater
b: b;its mass is smaller
c: c; its mass is smaller
d: b;its mass is greater

Answers

Answer: b

Explanation:

Ec= (1/2)m × v^2

By the formula, you can see that the bigger the mass, the bigger the Cinetic Energy.

b: b; its mass is smaller

Between ball B and ball C, ball B has LESS potential energy because its mass is smaller.

A potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched.

Potential energy is given by formula.

[tex]P.E= m*g*h[/tex]

Since, P.E is directly proportional to mass. Thus, the ball having smaller mass will have the less P.E.

Thus, option b is correct.

Learn more:

brainly.com/question/13584911

They did a flu shot from McKinnon at 45° to the horizontal with an initial speed of 25 m/s and that is positioned at a horizontal distance of 50 m from the canyon from which it is shot how long does it take the daredevil to travel the 50 m horizontally

Answers

Answer:

The time taken for the daredevil to travel the 50 m horizontally is 2.83 s.

Explanation:

Given;

angle of projection, θ = 45°

initial speed of the projectile, u = 25 m/s

horizontal distance traveled by the projectile, x = 50 m

The time taken for the daredevil to travel the 50 m horizontally is calculated as;

[tex]t =\frac{X}{u_x}[/tex]

where;

[tex]u_x[/tex] is the horizontal component of the velocity = uCosθ

[tex]t =\frac{X}{u Cos \ \theta} \\\\t =\frac{50}{25 \times Cos(45)} \\\\t= \frac{50}{17.678} \\\\t = 2.83 \ s[/tex]

Therefore, the time taken for the daredevil to travel the 50 m horizontally is 2.83 s.

Im so nervous about something and I need advice!!! PPPLLLLZZZZ DO NOT REPORT!! WILL MARK BRAINLIEST!!!

Answers

Answer: depends on what your nervous about

Explanation:tell me what your nervous about

Can yall help me please?? I can't get it wrong!

Answers

Answer:

The answer should be C

Explanation:

An area with an area with low air pressure

2. What is the acceleration of gravity on Planet x on which an object weights 300 N if it weighs 98 N on Earth?​

Answers

Answer:on Planet X on which an object weighs 300 N if it weighs 98 N on Earth? ... How are weight, mass, and acceleration due to gravity related

Explanation:

Which of the following would be considered an exercise program?

a
basketball
b
football
c
aqua dynamics

d
soccer

Answers

probably c

.........

Answer:

c

Explanation:

what is the measurements unit for force​

Answers

Answer:

newton

newtonThe SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m.

What is the magnification of an object that is 4.15 m in front of a camera that has an image position of 5.0 cm? I need to show work and i don’t know what to do

Answers

It’s -0.012


Done !!!!!!!

When magma is cooled, it changes into which of the following?

Answers

Answer: You didnt finish the question. But as magma cools it turns to igneous rock.

Which lighting source has lower energy costs and a longer life but can be dangerous?
a. fluorescent
b. laser
c. incandescent
d. neon

Answers

Answer: I'm like 98% sure it's fluorescent cause it's got mercury

Explanation:

Is visible light a form of
radiation? Explain.

Answers

Answer:

Yes,in fact visible 'light' is a form of radiation, which can be defined as an energy that travels in the form of electromagnetic waves. It can also be described as a flow of particle-like 'wave-packets', called photons, that travel constantly at the speed of light (about 300 000 kilometres per second).

Explanation:

If an element forms a 2+ ion in which group of the periodic table would you expect to find it

Answers

To form a 2+ ion, you need to lose two negatively charged electrons. Because metals have relatively empty outer shells, they lose electrons. Metals are on the left hand side of the table, and in order to lose two electrons, you need to have two electrons to start with. The groups of the table are based on the number of electrons an element has in the outer shell, so Group 2 metals will lose two electrons to gain a 2+ charge


So group 2:)

A 3.0 g bullet traveling at a speed of 400 m/s enters a tree and exits the other side with a speed of 200 m/s. Where did the bullet's lost KE go, and what was the energy transferred?

Answers

Answer:

1800J

Explanation:

Step one:

given data

mass of bullet m= 3g= 0.03kg

initial velocity u = 400m/s

final velocity v= 200 m/s

Step two:

1.The bullet's lost kinetic energy went inside the tree.

2. The energy transferred is computed as

= initial KE- KE final

Initial KE= 1/2mu^2

Initial KE= 1/2*0.03*400^2

Initial KE= 1/2*0.03*160000

Initial KE= 1/2*4800

Initial KE= 2400J

KE final= 1/2mv^2

KE final= 1/2*0.03*200^2

KE final= 1/2*0.03*40000

KE final= 1/2*1200

KE final= 600J

KE transferred = 2400-600

KE transferred= 1800J

4. The electric force between electric charges is much larger than the
gravitational forces between charges. Why, then, is the gravitational force
between the Earth and the Moon much larger than the electric force between
them?*
A. The electric force is small in comparison because charges are VERY small but the
gravitational force has to do with the mass of the Earth and Moon.
B. The electric charge is actually greater and the question is false.
C. The phases of the Moon determine the amount of electric and gravitational force.

Answers

The electric force is small in comparison because charges are VERY small but the

gravitational force has to do with the mass of the Earth and Moon.

Write down the factors on which moment depends upon ?​

Answers

Answer:

The size of a forceThe perpendicular distance from the pivot the line of action of force

Explanation:

Factors that affect the moment of a force are;

The size of a forceThe perpendicular distance from the pivot the line of action of force

The magnitude of force applied is directly proportional to the moment of force in that for a perpendicular distance d, increased in force applied will result to a higher moment of force. When the perpendicular distance from the pivot is decreased while the force applied remains constant, the moment of force decreases.

How are mass and volume alike

The cease to exist when placed in a liquid

They are only found in solids

They always stay the same

They are both measured in grams

Answers

I think its B: they are only found in solids.

Shawn is doing drills out on the field by pulling a tire behind him for 30 m. If Shawn is applying a net force of

1200 N to pull the tire, then how much work is Shawn doing?

Answers

Answer:

The work done by Shawn in moving the tire is 36,000 J

Explanation:

Given;

net force applied by Shawn , F = 1200 N

distance he moved the tire, d = 30 m

The work done by Shawn in moving the tire is calculated as;

W = Fd

Substitute the given values and solve for Work done;

W = 1200 x 30

W = 36,000 J

Therefore, the work done by Shawn in moving the tire is 36,000 J

How does static electricity apply to car
paint application?

Answers

Answer:

For electrostatic paint to be applied, the vehicle needs to be grounded and positively charged. This creates a magnetic attraction to the negatively charged paint. Due to this charge, when the paint leaves the nozzle, it is attracted to the vehicle's charge and will stick to it.

Explanation:

Using the information given, find the Atomic Mass of the unknown element: 12 PROTONS, 12 NEUTRONS, 12 ELECTRONS​

Answers

Answer:

A. 12

Explanation:

Answer is 12

Explanation

help meeeeeeeeeeee
i need help on drawing a school gym for one of my classes

Answers

Answer:

a little to late

Explanation:

srry

Nuclear Physicist or Scientist (It doesn't really matter)
Describe the properties of waves that make the technology that a Nuclear Physicist or Scitenist uses possible. If you have chosen a research career, what topics are the researchers interested in learning more about? Some properties you can discuss include: transverse or longitudinal, wavelength, frequency, amplitude, travels through a vacuum or does not

Thank you!

Answers

Answer:

Radio waves

Explanation:

Would a ship in Lake Ontario (fresh water) float higher or lower in the water than in the Atlantic Ocean (salt water)?

Answers

Atlantic Ocean (salt water)

1.Seema is the wife of and Rahul is the brother of Robin. Robin is the only uncle of Ram .What is Ram relation with Seema ?​

Answers

Answer:

Ram is the son of Seema

Son po siya ni Seema

what is the velocity of a car that travels 175 miles in 3.0 hours ?​

Answers

Answer:

58.3333333

miles

Explanation:

Which best explains why trees are considered a renewable resource? O They are useful to humans. O They can be replanted. 0 They provide a source of food. They are used to produce heat.​

Answers

Answer:

They can be replanted.

Explanation:

Renewable sources can be found again and again, similar to how you can plant a tree again to receive food sources and heat production, which in turn is useful to humans.

When The trees are considered a renewable resource because They can be replanted. The correct option is 'B'.

What is a Renewable Resource?

When Renewable sources can be found, again and again, similar to how you can plant a tree again to receive food sources and also heat production, they are in turn useful to humans.

When the renewable resources are resources, generally naturally happening, they can replenish to the rate that they can return the used volume and also be swallowed.

A renewable resource will either produce itself naturally through automatic approaches to that resource or through human interaction and guidance.

Therefore, The correct option is 'B'.

Find more information about Renewable Resource here:

https://brainly.com/question/25389846


2. Two projectiles thrown from the same point at angles 0,=60° and 02=30° with the horizontal,
attain the same height. What is the ratio of their initial velocities (Voi:Voz)?

Answers

Answer:

The answer is below

Explanation:

The maximum height (h) of a projectile with an initial velocity of u, acceleration due to gravity g and at an angle θ with the horizontal is given as:

[tex]h=\frac{u^2sin^2\theta}{2g}[/tex]

Given that the two projectile has the same height.

[tex]For\ the\ first\ projectile\ with\ an\ angle\ \60^0 \ with\ the\ horizontal\ and initial\ velocity\ u_1:\\\\h=\frac{u_1^2sin^260}{2g} =\frac{0.75u_1^2}{2g} \\\\For\ the\ second\ projectile\ with\ an\ angle\ \30 \ with\ the\ horizontal\ and initial\ velocity\ u_2:\\\\h=\frac{u_2^2sin^230}{2g} =\frac{0.25u_2^2}{2g}\\\\\frac{0.25u_2^2}{2g}=\frac{0.75u_1^2}{2g}\\\\0.25u_2^2=0.75u_1^2\\\\\frac{u_1^2}{u_2^2} =\frac{0.25}{0.75} \\\\\frac{u_1^2}{u_2^2}=\frac{1}{3} \\[/tex][tex]\\\frac{u_1}{u_2}=\sqrt\frac{1}{3}[/tex]

What is one of the forms of a gene called?

allele

dominant

heterozygous

recessive

Answers

Answer:

Explanation:

.

Answer:

alleles

my answee need to be at least 20 characters long :(

A train is accelerating at a rate of 2.0 m/s/s. If it accelerates at this rate for 30
seconds, what is the change of velocity? *

Answers

Answer:

60m/s

Explanation:

Given parameters:

Acceleration  = 2m/s²

Time  = 30s

Unknown:

Change in velocity  = ?

Solution:

Acceleration is the rate of change of velocity with time.

Mathematically;

         Acceleration  = [tex]\frac{Change in velocity }{Time }[/tex]

Now,

 Change in velocity  = Acceleration x time

So,

  input the parameters and solve;

 Change in velocity  = 2 x 30  = 60m/s

A clock's hour hand goes through 1.5 revolutions in 90
minutes.Calculate the angular displacement of the minute hand in
degrees

Answers

Answer:

Explanation:

how far around a circle is once around in degees?

1.5 * 360 = 540°

The shortstop plays between first and second base.
true or false

Answers

SINGLE TO RIGHT OR CENTER FIELD-On a single to center or right field the first baseman will be the cutoff to home. The shortstop will cover second base.

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