Answer:
The brick was traveling at 49 m/s the instant before hitting the ground.
Explanation:
When an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is [tex]g = 9.8 m/s^2[/tex].
The final velocity of a free-falling object after a time t is given by:
[tex]vf=g.t[/tex]
The distance traveled by a dropped object is:
[tex]\displaystyle y=\frac{gt^2}{2}[/tex]
The brick takes 5 seconds to land from the high scaffold. The speed at which it lands is:
[tex]vf=9.8\cdot 5[/tex]
vf=49 m/s
The brick was traveling at 49 m/s the instant before hitting the ground.
A car stops with an acceleration of -20 m/s/s in 8 seconds. How far did it go while stopping?
Answer:
640 m.
Explanation:
The following data were obtained from the question:
Acceleration (a) = –20 m/s/s
Time (t) = 8 s
Final velocity (v) = 0 m/s
Distance (s) =.?
Next, we shall determine the initial velocity (u) of the car. This can be obtained as follow:
Acceleration (a) = –20 m/s/s
Time (t) = 8 s
Final velocity (v) = 0 m/s
Initial velocity (u)
a = (v – u) / t
–20 = (0 – u) / 8
–20 = – u / 8
Cross multiply
–20 × 8 = – u
– 160 = – u
Divide both side by – 1
u = – 160 / – 1
u = 160 m/s
Finally, we shall determine the distance travelled by the car before stopping as follow:
Time (t) = 8 s
Final velocity (v) = 0 m/s
Initial velocity (u) = 160 m/s
Distance (s) =.?
s = (v + u)t /2
s = (0 + 160) × 8 /2
s = (160 × 8) /2
s = 1280 / 2
s = 640 m
Therefore, the car travelled 640 m before stopping.
In a scientific test conducted in Arizona, a special cannon called HARP (High Altitude Research Project) shot a projectile straight up to an alti-tude of 180.0 km. If the projectile's initial speed was 3.00 km/s, how long did it take the projectile to reach its maximum height?
Answer:
It took the projectile 120 s to reach the maximum height.
Explanation:
Given;
maximum height of the projectile, s = 180 km = 180,000 m
initial speed of the projectile, u = 3 km/s = 3000 m/s
final velocity at maximum height, v = 0
Apply the following kinematic equation for average velocity of the projectile;
[tex]s = (\frac{v+u}{2} )t\\\\(v+u)t = 2s\\\\t = \frac{2s}{v+u} \\\\t = \frac{2*180,000}{0+3,000}\\\\ t = 120 \ s[/tex]
Therefore, it took the projectile 120 s to reach the maximum height.
Find the direction of the sum of
these two vectors:
12.0 m
45.0°
9.66 m. A
m A,
Answer:
82.2
Explanation:
It’s due by tonight, please show work.
Plz guys answer my question
Define kinetic energy and thermal energy. Describe what happens to each as the temperature of a substances increases.
Answer:
All matter is made up of particles that are constantly moving. The motion of the particles results in kinetic energy. The part of total internal energy that can be transferred is thermal energy. As temperature increases, the particles in a substance move faster and have greater kinetic and thermal energy.
Explanation:
Question 7 of 10
Which event is an example of melting?
A. People see their breath on a cold winter day.
B. Dew forms on the leaves of a tree.
C. Frost forms on a blade of grass.
O D. An ice cube forms a small puddle on the counter.
WHICH TYPES OF ENERGY IS HAPPENING
Answer:
kinetic energy turned potential energy
Explanation:
it moves up the hill and stops so the movement is kinetic energy and the stop is potential energy
If you could repeat the lab and make it better, what would you do differently and why? There are always ways that labs can be improved. Now that you are a veteran of this lab and have experience with the procedure, offer some advice to the next scientist about what you suggest and why. Your answer should be at least two to three sentences in length.
Answer:
I suggest that you recheck your answers multiple times and make sure that they are making sense. Also I think that you should Study the organisms very well and you should be careful when making observations so that you really are sure that the organism has 4 wings and not only 2 wings(for example).
Explanation:
I hope this answers your question
PLEASE MARK ME BRAINLIEST :) :) :) :) :)
To win the game, a place kicker must kick a football from a point 21 m (22.9656 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 16 m/s at an angle of 55.3◦ from the horizontal. The acceleration of gravity is 9.8 m/s^2 By how much vertical distance does the ball clear the crossbar? Answer in units of m
In projectile horizontal distance is given by :
[tex]h = \dfrac{u^2sin^ 2\theta}{2g}[/tex]
Putting all given values, we get :
[tex]h = \dfrac{u^2sin^ 2\theta}{2g}\\\\h=\dfrac{16^2\times sin^2 \ 55.3^o}{2\times 9.8}\\\\h=13.1\ m[/tex]
Therefore, maximum height of football is 13.1 m.
Hence, this is the required solution.
Find the length of a rectangle with the area 20cm² and width 10cm
Answer:
The answer is 2 because 10 times 2 equals 20
Explanation:
Answer:
2 cm
Explanation:
A=L * w
20 = 10 * L
L = 20/10
L = 2cm
What role do electrons play in creating intermolecular forces?
The electrons repel positively charged molecules
Electron movement creates partial charges in different regions of molecules
They don't play any role
Electrons prevent dipole dipole interactions
Answer:
Electron movement creates partial charges in different regions of molecules.
Explanation:
The electrons play a role in the creation of London forces, which are intermolecular forces produced by the movement of the electrons in the atoms and molecules. The distribution of electrons will produce the formation of a temporary dipole, generating a partial charge in the atoms, which can induce a dipole into a subsequent atom (creating again partial charge), and so on.
Hence, the correct option is the second option: Electron movement creates partial charges in different regions of molecules.
I hope it helps you!
The role played by electrons in creating intermolecular forces is that electron movement creates partial charges in different regions of molecules.
Molecules are held together by intermolecular forces. There are several kinds of intermolecular forces such as;
Dipole - dipole interactionDispersion forcesHydrogen bonding etcIn all the kinds of intermolecular interactions mentioned above, interaction between molecules is made possible by movement of electrons which creates temporary or permanent dipoles in molecules due to partial charges in different regions of molecules.
Learn more: https://brainly.com/question/14281129
PART II – CHOOSING THE APPROPRIATE UNIT For each example below choose the appropriate unit to measure each (mm, cm, m or km). 1. Width of physics book _____ 2. Distance from New York to Utah _____ 3. Length of fingernail _____ 4. Length of hallway _____ 5. Height of a mountain _____ 6. Length of a fork _____ 7. Distance between cities _____ 8. Width of your eyeball _____
Answer:
Explanation:
In this unit of measurement for distance or length, the units are arranged from the least to the largest unit i.e
mm < cm < m < km
Where mm is millimeter, cm is centimeter, m is meter and km is kilometer.
Hence, the appropriate unit to be used depends on how small or wide the length/distance being referred to is. For instance, the length of a stapler pin should be measured in millimeter while the length of a pen should be measured in centimeter. The appropriate measurement can be determined by determining the closest unit the value falls into. For instance, there is no need to refer to a length as 1000 cm when it can be referred to as 10 m (since 100 cm equals 1 m)
1. Width of a physics book should be measured in centimeters (this is similar to length of a pen).
2. Distance from New York to Utah should be measured in kilometers (Distance between far cities or states are measured in kilometers).
3. Length of a fingernail should be measured in millimeters (this is similar to the length of a stapler pin)
4. Length of hallway should be measured in meters (This is generally larger than centimeter but lesser than kilometer)
5. Height of a mountain should be measured in kilometers (This is usually a very long distance from the earth surface)
6. Length of a fork should be measured in centimeters (This is similar to the length of a pen).
7. Distance between cities should be measured in meters (except the distance is far apart, distance between close cities are measured in meters)
8. Width of the eyeball should be measured in millimeters (similar to the length of a stapler pin and fingernail).
Physics is Confusing :( pt 2
Answer:
C
Explanation:
yeah it is
Use the information from the graph to answer the question. What is the acceleration of the object?
m/s2
The acceleration of the object is determined as -2.5 m/s².
What is acceleration?Acceleration is the rate of change of velocity with time.
Mathematically, acceleration is given as;
a = Δv/Δt
a = (v₂ - v₁)/(t₂ - t₁)
where;
v₂ is the final velocityv₁ is the initial velocityt₂ is the final timet₁ is the initial timeFrom the graph;
the initial velocity = 40 m/s
the final velocity = 10 m/s
the final time = 12 seconds
the initial time = 0 second
acceleration = (10 - 40) / (12 - 0)
acceleration = -30/12
acceleration = -2.5 m/s²
Thus, the acceleration of the object is determined as -2.5 m/s².
Learn more about acceleration here: https://brainly.com/question/605631
#SPJ1
You burn a 100 kg log. If you add the mass
of the log, soot and gasses given off
while the log was burning they will equal
A.120kg B. 50kg C.100 D. 80
Answer:c.100
Explanation:
True or False: Exercise is an underrated stress reliever and can be used to 25
overcome mental, physical, and emotional battles."
O True
False
Answer:
I think it is true I'm not saying it is but if you get another person who says its true say true
Explanation:
What does it mean to say that mass is conserved during a physical change?
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
Answer:
100% oon test
Explanation:This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
electric bulb connected to a 220 volt supply line draw a current of 0.05 ampere calculate the amount of coulomb super second following to the bulb
You don't need to calculate anything.
You said "0.05 Ampere".
"Ampere" means "coulomb per second".
When momentum is transferred from one object to another, their combined momentum remains the same. * True or False
Answer:
true
Explanation:
hope this helps
A 25.1 kg boy climbs to the top of a 11.08 m tall water slide at an amusement park. He carries a 2.94 kg rubber ball with him. Taking the bottom of the slide to be the zero point, what is the gravitational potential of just the boy in joules? (do not include units)
Answer:
3080
Explanation:
Potential energy is the energy stored or contained in a body as a result to its relative position to other objects, an example is an object that is placed at a height above the ground thereby experiencing gravitational energy.
Potential energy = mass × gravity × height
Given that: height = 11.08 m, gravity = 9.81 m/s² and mass = mass of boy + mass of ball = 25.1 + 2.94 = 28.34 kg
Potential energy =28.34 × 9.81 × 11.08 = 3080
The organisms and environments that make up a community, called an Response area, are constantly changing. Sudden and violent events, such as Response area from the ocean and Response area, that often cause these changes are called Response area. Response area results when rainfall exceeds the holding capacity of a drainage system.
Answer:
ecosystem; hurricanes and tornadoes; catastrophic events.; Fooding; moving water; soil
Explanation:
After using the word bank to fill in the blanks in the passage, the passage reads;
"The organisms and environments that make up a community called an ecosystem are constantly changing. Sudden and violent events, such as hurricanes and tornadoes that often cause these changes are called catastrophic events. Fooding results when rainfall exceeds the holding capacity of a drainage system. The energy of the fast-moving water and the layers of sediment carried by it can uproot or bury plants, reshape the soil and destroy roads and buildings."
Potential energy calculation - MxGxH. Gravity equals 10. How much
potential energy does a 5 gram golf ball that is falling from 40 ft have? Use
your calculator if need be. *
Answer:
Ep = 0.6095 [J]
Explanation:
As defined in the problem statement, potential energy is defined as the product of mass by gravity by height. But first we must convert all the values given to measures of the international system (SI)
g = gravity = 10 [m/s^2]
h = elevation = 40 [ft] = 12.19 [m]
m = mass = 5 [g] = 0.005 [kg]
Ep = potential energy [J]
Ep = 0.005*10*12.19 = 0.6095 [J]
A speed-time graph is shown below:
Speed vs. Time
What is the average acceleration of the object represented in the graph above over the eight seconds?
A) 0.5 cm/s2
B) 1.0 cm/s2
C) 1.5 cm/s2
D) 2.0 cm/s2
Answer:
The average acceleration of the object is 0.5 cm/s^2. Answer: A)
Explanation:
Average Acceleration
The average acceleration of a moving object is the rate at which the speed changed over time in a specific period. It can be calculated as follows:
[tex]\displaystyle \bar a=\frac{v_f-v_o}{t}[/tex]
Where vf is the final speed, vo is the initial speed and t is the time.
The speed-time shows the speed starts at 0 cm/s and ends at 4 cm/s over the 8 seconds period. The average acceleration is:
[tex]\displaystyle \bar a=\frac{4-0}{8}=0.5[/tex]
The average acceleration is 0.5 cm/s^2
A) Correct. The average acceleration is 0.5 cm/s^2
B) Incorrect. The average acceleration is 0.5 cm/s^2
C) Incorrect. The average acceleration is 0.5 cm/s^2
D) Incorrect. The average acceleration is 0.5 cm/s^2
Answer:
A) 0.5 cm/s2
Explanation
I took the quiz the correct answer is A
Why can we have faith in our scientific understandings? Why or why not?
I need help guyssss plssss
Answer:
Cd(NO3)2 + Na2S --> CdS + 2 NaNO3
Explanation:
HElP ME PLEASSEEEE ITS URGENT!!!
Answer:
1. states
2. kinetic theory
3.particles cqlled atoms
4.motion
5.collide
thats all I remember
Who yall think gonna win Seahawks or Vikings? Seahawks all the way
Answer:
Seahawks
Explanation:
THEY ARE THE BEST TEAM!!!
Answer:
seahawks
Explanation:
yes they r gud
a car traveling at a speed of 46 m/s encounters an emergency and comes to a complete stop. how much time will it take for the car to stop if it accelerates at -1m/s/s
Please help! Due in 10 min! Please show work!
Davien and Jackson are headed to a beach that is 50km from school. At noon, Davien leaves his house that is 10 km closer to the beach than the school is and moves at 40 km/h. Jackson starts from school at 12:30 P.M. and moves at 100 km/h. What time does Davien reach the beach? *
Answer:
They both arrive at 1:00 PM
Explanation:
Amount Davien has to drive : 40km
Amount Jackson has to drive = 50km
Davien moves at 40km/h,
Therefore, it only takes Davien 1 hour to get there.
12:00 PM + 1 hour = 1:00 PM
Jackson moves 100km/h
He needs to drive 50 min, so 50/100 = 1/2
It takes him half an hour, or 30minutes
If he leaves at 12:30, then he gets there at 1:00 PM
