Answer:
it has the same mechanicals as a baseball
Explanation:
A food packet is dropped from a helicopter during a flood-relief operation from a height of 750 meters. Assuming no drag (air friction), what will the velocity of the packet be when it reaches the ground?
Answer: 121.2 m/s
Explanation:
Here we will use the conservation of energy.
We can write the total energy of an object as:
E = K + U
For this particular case we have:
K = kinetic energy = (m/2)*v^2
U = potential energy = m*g*h
where:
m = mass of the object.
g = gravitational acceleration = 9.8m/s^2
h = height at which the object is dropped, in this case 750m
v = velocity of the object.
Right when the packet is dropped, it's velocity is equal to zero, this means that there is no kinetic energy and only potential energy, then we have:
Ei = Ui = m*9.8m/s^2*750m = m*(7350m^2/s^2)
And when the object is about to hit the ground, h will be almost equal to zero, this will mean that we will have only kinetic energy, and because of the conservation of energy, this final energy must be the same as the initial energy, then we will have
Ei = Ef
m*(7350m^2/s^2) = Ef = Kf
m*(7350m^2/s^2) = (m/2)*v^2
We can divide by m in both sides to get:
(7350m^2/s^2) = (1/2)*v^2
√( 2*(7350m^2/s^2)) = v = 121.2 m/s
Then the velocity of the packet when it reaches the ground is 121.2 m/s
What term or phrase describes a point that appears to stay in place and can be used to detect the motion of an object?
Answer:
reference point
Explanation:
you can use a reference point to tell when an object is in motion or staying still. :)
A 20 kg mass is hanging on one side of a pulley and a 5 kg mass is hanging on the other. Determine the acceleration of each mass.
Answer:
i believe it's 7
Explanation:
Please do all of i will give you brainlest and thanks to best answer plz do it righ
Answer:
Winter
Explanation:
1.) What is the process called when a liquid changes to a
gas below the boiling point?
2.) What phase of matter maintains its shape when a
force is applied?
ASAP???? 16 points need help ?????
Answer:
1.)Evaporation, 2.) solid
Explanation:
hope this helps can i get brainliest
Which of the following is an example of rotation?
O A. The Moon traveling around Earth
O B. A car driving around a racetrack
O C. Earth traveling around the Sun
O D. An ice skater spinning in place
Plz di all plz i will give brainest and thanks to best answer do it right
6. A car drives 750 miles in 10 hours. Calculate the speed of the truck
.
Answer:
75 miles an hour
I hope this is correct and helps
A 50 kg object is accelerating to the right at 5 m/s2. What is the net force acting on the object?
Answer:
250 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 50 × 5
We have the final answer as
250 NHope this helps you
Which of the following is NOT a characteristic of members of the plant kingdom?
A.Specialized tissues for water absorption
B. Cells are eukaryotic
C. Perform photosynthesis to produce glucose
D. Cell wall made of cellulose
Answer:
A. i think
Explanation:
Which of the following is a resistor?
fan
switch
battery
Thank you!
What is pitch?
O A measure of the speed of sound
O The highness or lowness of sound
O A characteristic of light
Answer:
The second one
Answer:
The highness or lowness of sound
Explanation:
Help me pretty please with a cherry on top!!
Answer:
A. im not for sure hope it helps
Explanation:
A 10kg ball has a momentum of 40 kg.m/s. What is the ball’s speed.
Show the work and equations.
Answer:
4 m/sExplanation:
The speed of the ball can be found by using the formula
[tex]s= \frac{p}{m} \\ [/tex]
p is the momentum
m is the mass
From the question we have
[tex]v = \frac{40}{10} = 4 \\ [/tex]
We have the final answer as
4 m/sHope this helps you
HELP ASAP TIMED TEST
A snowball is dropped from a height of H and reaches the ground with a speed of V. If you want to double the speed that the snowball has when it reaches the ground, at what height should you drop it from?
a
2H
b
4H
c
√2H
d
8H
e
16H
Answer:
Correct choice: b 4H
Explanation:
Conservation of the mechanical energy
The mechanical energy is the sum of the gravitational potential energy GPE (U) and the kinetic energy KE (K):
E = U + K
The GPE is calculated as:
U = mgh
And the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass of the object
g = gravitational acceleration
h = height of the object
v = speed at which the object moves
When the snowball is dropped from a height H, it has zero speed and therefore zero kinetic energy, thus the mechanical energy is:
[tex]U_1 = mgH[/tex]
When the snowball reaches the ground, the height is zero and the GPE is also zero, thus the mechanical energy is:
[tex]\displaystyle U_2=\frac{1}{2}mv^2[/tex]
Since the energy is conserved, U1=U2
[tex]\displaystyle mgH=\frac{1}{2}mv^2 \qquad\qquad [1][/tex]
For the speed to be double, we need to drop the snowball from a height H', and:
[tex]\displaystyle mgH'=\frac{1}{2}m(2v)^2[/tex]
Operating:
[tex]\displaystyle mgH'=4\frac{1}{2}m(v)^2 \qquad\qquad [2][/tex]
Dividing [2] by [1]
[tex]\displaystyle \frac{mgH'}{mgH}=\frac{4\frac{1}{2}m(v)^2}{\frac{1}{2}m(v)^2}[/tex]
Simplifying:
[tex]\displaystyle \frac{H'}{H}=4[/tex]
Thus:
H' = 4H
Correct choice: b 4H
21. A teacher does the following:
i. walks 4 m, south
ii. walks 8 m, east
iii. walks 4 m, north
iv. walks 8 m, west.
The overall displacement of the teacher is
a. Om
b. 6 m
c. 12 m
d. ... Nonsense! It cannot be calculated without knowing time information.
Answer:
displacement is the change from a starting point. she ends up back where she started so her displacement is zero meters although she traveled 24m in all.
If you are sitting in a bus that is traveling along a straight, level road at 100 km/hr., you are traveling at 100 km/hr too. (a) If you hold an apple over your head, how fast is it moving relative to the road? (b) Relative to you? (c) If you drop the apple, does it still have the same horizontal motion? Explain.
What Law is it?
(a) The velocity of the apple with respect to the road is 100 km/h.
(b) The velocity of the apple with respect to you is 0 km/h.
(c) If you drop the apple the horizontal velocity will not change due to law of conservation of linear momentum.
What is the relative velocity of the apple?
The relative velocity of the apple placed over your with respect to the road is calculated as follows;
Velocity of the apple = 100 km/h
Velocity of the road = 0 km/h
Va/r = 100 km/h - 0 km/h
Va/r = 100 km/h
The velocity of the apple relative to you is calculated as follows;
your velocity = 100 km/h
velocity of the apple = 100 km/h
Va/y = 100 km/h - 100 km/h
va/y = 0 km/h
If you drop the apple, the horizontal velocity will remain the same, because gravity does not affect horizontal motion.
The law is law of conservation of linear momentum.
Learn more about relative velocity here: https://brainly.com/question/17228388
#SPJ1
where does reduction occur in an electrolytic cell
a. cathode
b. salt bridge
c. anode
d. wire
Answer:
The answer is actually a. Cathode
Explanation:
Just took the quiz
In an electrolytic cell, the reduction occurs at the cathode. So, the correct option is a.
What is meant by reduction ?Reduction is defined as the process through which a reactant gain electrons during a chemical reaction.
Here,
An electrolytic cell is an equipment that uses electric current to drive a redox reaction.
Redox reactions are the type of reaction that involves the transfer of electrons between the reactants. That means, in redox reactions, both oxidation and reduction occurs. The reactant that gains the electrons is said to be reduced and the one that losses the electrons is said to be oxidized.
In an electrolytic cell, cathode is the positively charged electrode. So, electrons are attracted towards it, and as a result, the cathode gets reduced.
Hence,
In an electrolytic cell, the reduction occurs at the cathode.
To learn more about reduction, click:
https://brainly.com/question/1222373
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what is the two kinds of solids in amorphous
Solids can be classified into two types: crystalline and amorphous. Crystalline solids are the most common type of solid. They are characterized by a regular crystalline organization of atoms that confer a long-range order. Amorphous, or non-crystalline, solids lack this long-range order.
If a refrigerator draws about 0.5 amps when plugged into a 120 V wall outlet how much power (watts) does it use?
Answer:60 W
Explanation:
7. A 1000-kg car comes to a stop without skidding. The car's brakes do 50,000 J of work
to stop the car. Which of the following was the car's velocity when the brakes were
initially applied?
Answer:
10 m/s
Explanation:
Ronald observes a large island off the coast of Indonesia on a map. A few months later, he observes that there are many smaller islands in place of the large one he had seen earlier. Which of these could have caused this change?
Answer:
idgaf
Explanation:
lol
how longitudinal waves are formed
Answer:
forever
Explanation:
If you add an additional neutron to an atomwhat do you create?
Answer:
However, if you add a thousand neutrons, you will be creating one super-radioactive atom. Neutrons play a major role in the mass and radioactive properties of atoms. You may have read the page on isotopes. Isotopes are created when you change the normal number of neutrons in an atom.
Explanation:
The neutron is a subatomic particle, symbol n or n⁰, which has a neutral (not positive or negative) charge and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Their properties and interactions are described by nuclear physics.
PLEASE HELP!!!! What happens to cause the tissue around a cut to become swollen run and painful
O A .White blood cells burst and release wastes made by digesting pathogens.
O. B Fluid and white blood cells move into the tissue from nearby blood vessels
O. C Lymph nodes develop in the tissue and begin trapping pathogens
O. D Chemical messengers released by the tissue cause nearby muscles to contract and pull on bones
Answer:
the answer would be B
Explanation:
swelling is the result of the increased movement of fluid and white blood cells into the injured area.
HELP ASAP !
Which of the following situations would result in no work done by the force indicated?
a
The object undergoes only a slight displacement while the force is acting on it.
b
The force is perpendicular to the displacement of the object.
c
The force is not completely parallel to the displacement of the object
d
All of the above result in no work done by the force indicated.
Answer:
b The force is perpendicular to the displacement of the object.
Explanation:
Work is done when a force is applied on a body causing it to move in a particular direction.
Work done = Force x displacement
For work to be done, a force must applied on a body to move it through a specific distance in direction.
When force is perpendicular to the displacement of the object, the component vector resolution is 0 and the work done is 0.
A rectangular block measures 4.1 cm by 2.8 cm by 2.1 cm.
Calculate its volume giving your answer to an appropriate
number of significant figures.
Answer:v=l x w x h
Explanation:
h=height
w=width
l=length
Answer:
24.108 cm3
Explanation:
4.1x2.8x2.1
24.108cm3
A Car accelerates from 4 m/s to 16 m/s in 4 seconds. What is the car's
acceleration?
O 12 m/s^2
3 m/s^2
4 m/s^2
O 1 m/s^2
Answer:
4 m/s^2
that is the right acceleretion a car
Answer:
I believe that the answer is 3 m/s^2
Explanation:
since acceleration is final velocity minus initial velocity divided by time, we can plug in known values and solve.
a=(f-i)/t
a=(16-4)/4
a=12/4
a=3
3m/s^2 is the acceleration
How do I calculate how many meters are in 7.2 light years?
The exact question is:
Calculate in meters the distance between a galaxy and the Earth if the distance is equal to 7.2 light years.
Answer:
68.2 Quadrillion meters
Explanation:
A lightyear is the distance that light travels in one year.
Speed of light is [tex]3*10^8\ m/s[/tex]
So light covers 300,000,000 meters in one second.
One year has 31536000 seconds so , light covers
[tex]9.461*10^{15}\ meters\ in\ one\ year[/tex]
so 7.2 light years is
[tex]7.2*(9.461*10^{15})\\6.82*10^{16}[/tex]
so 7.2 light years is
6.82 x 10^(16) meters or
68.2 Quadrillion meters
A supply plane drops a package to the ground for stranded campers below. After falling for 8.14 seconds, the package will have a downward velocity of 80.79 m/s. How high was the plane when it dropped the package?
Answer:
333 m
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 0 m/s.
Time (t) = 8.14 s.
Final velocity (v) = 80.79 m/s.
Acceleration due to gravity (g) = 9.8 m/s²
Height (h) =?
v² = u² + 2gh
80.79² = 0 + (2 × 9.8 × h)
6527.0241 = 0 + 19.6h
6527.0241 = 19.6h
Divide both side by 19.6
h = 6527.0241 / 19.6
h = 333 m
Thus, the plane was at a height of 333 m when the package was dropped.
