Answer:
(a) 100.38 m
(b) 183.49 m
(c) 6.12 seconds and 12.24 seconds.
Explanation:
Given that a body is thrown vertically upwards with a velocity of 60 m/s.
Assuming that upward direction is positive
So, the initial velocity, u=60 m/s
As the acceleration due to gravity, g=9.81 m/s^2, acts in the downward direction, so
a=-9.81 m/s^2
(a) By using the equation of motion, the displacement of the body after time t=2 seconds, is
[tex]s=ut+\frac 1 2 at^2 \\\\ s=60\times 2 +\frac 1 2 (-9.81)2^2 \\\\[/tex]
s=100.38 m
Hence, the height of the body will be 100.38 m after 2 seconds.
(b) At the maximum height, the velocity of the object is zero, so
v=0.
The maximum height is the displacement of the body where it attains zero velocity.
Using the equation of the motion.
[tex]v^2=u^2+2as \\\\0= 60^2 +2(-9.81)s \\\\s=\frac {3600}{2\times 9.81} \\\\[/tex]
s=183.49 m
Hence, the maximum height of the body is 183.49 m.
(c) Time to reach the maximum height
v=u+at
0=60 +(-9.81)t
t=60/9.81
t=6.12 seconds.
The body will take 6.12 seconds to reach the maximum height.
As the time to reach the maximum height from the initial position is the same as the time to reach the initial position from the maximum height.
So, the total time to returns again to the place where it was launched
= 2 x 6.12 = 12.24 seconds.
Alan and Monica tested how fertilizer X affected the growth of a plant. Alan and Monica put 100 grams of fertilizer X in pot 1. They put 0 grams of fertilizer X in pot 2.
What is pot 2 called in science?
A.
a test group
B.
a data group
C.
an observational group
D.
a control group
Answer:
D.
a control group
Explanation:
In a scientific experiment such as the one above, there is an experimental group and a control group. The experimental group is the group that receives the treatment while the control group does not receive any treatment. The control group helps the researcher to observe if the treatment had any significant effect.
In this case, it will help Alan and Monica to determine if fertilizer X actually had an effect on the plant. Therefore, the pot with o grams of fertilizer in it is the control group.
If the torque required to loosen a nut on the wheel of a car has a magnitude of 40.0Nm, what minimum force must be exerted by a mechanic at the end of a 30.0cm wrench to loosen the nut
Explanation:
Minimum force means that the force should be applied at a 90° angle from the wrench.
40.0Nm / (0.30m) = 133.33N.
The mimumum force is 133.33N.
A box is 30cm wide 40cm long and 25cm high calculate area boa
Answer:
SA = 5900 sqcm
Explanation:
I am assuming you meant surface area since this is a three dimensional box. This formula for surface area (SA) is SA = 2 (wl + hl + hw). Once you have that would just have to plug the numbers in and calculate!
a pupil adds 37g of ice at 0°C to 100g of water at 30°C. The final temperature of the water and melted ice is 0°C. no heat is lost to, or gained from, the surroundings.
The specific heat capacity of water is 4.2 J/ (g°C)
what is the specific latent heat of ice?
A) 47 J/g c) 4700 J/g
b) 341 J/g d) 12600 J/g
Answer:
The specific latent heat of ice is approximately 341 J/g
The correct option is;
b) 341 J/g
Explanation:
The given parameters are;
The mass of ice the pupil adds to the water, m₁ = 37 g
The initial temperature of the ice, T₁ = 0°C
The mass of the water to which the ice is added, m₂ = 100 g
The initial temperature of the water, T₂₁ = 30°C
The final temperature of the water and the melted ice, T₂₂ = 0°C
The specific heat capacity of the water, c₂ = 4.2 J/(g·°C)
By the principle of conservation of energy, we have;
The heat gained by the ice = The heat lost by the water = ΔQ₂
Given that the ice is only melted with no change in temperature, we have;
The heat gained by the ice = The latent heat needed for melting the ice
ΔQ₂ = m₂ × c₂ × (T₂₂ - T₂₁) = 100 × 4.2 × (0 - 30) = -12,600 J
The heat gained by the ice = m₁ × [tex]L_f[/tex]
Where;
[tex]L_f[/tex] represents the specific latent heat of fusion of ice;
We have;
12,600 = 37 × [tex]L_f[/tex]
[tex]L_f[/tex] = 12,600/37 = 340.54 J/g ≈ 341 J/g
The specific latent heat of fusion of ice = [tex]L_f[/tex] ≈ 341 J/g.
help pls i need this right now
Answer:
0i,63.5j. Just see i as x and j as y
The north pole of one bar magnet is near the south pole of another bar
magnet. What happens to the magnets?
A. They twist away from each other.
B. They repel each other
C. They attract each other.
D. They neither attract nor repel each other.
Answer:
I think it could be C.
hope it helps!
Certain family dynamics, such as abusive parenting, can increase the susceptibility of someone developing a(n) __________ disorder.
Answer:
personality disorder
Explanation:
Certain family dynamics, such as abusive parenting, can increase the susceptibility of someone developing a(n) personality disorder.
How does a person with personality disorder behave?
A disorder is diagnosed when these personality traits are significantly “deviated” from others and are very inflexible, impairing a person's adaptation to everyday situations and causing distress and discomfort in their personal relationships and other areas of life.
Personality disorders are generally pervasive and persistent patterns of thinking, perceiving, reacting, and relating that cause significant distress or functional impairment.
See more about personality disorders at brainly.com/question/27291111
FOR A liquid drop of radius r falling in air with terminal velocity, power delivered by gravitational force is propotional to
Answer:
P = m g v
Explanation:
Power is defined as the relationship between work and time
P = W / t
The work is defined by the scalar product of the force and the displacement, in the case of a drop falling the vertical force and the displacement has the same direction, therefore the angle between them is zero and the cosines of zero is one (cos 0 = 1)
W = F y
the gravitational force is proportional to the weight of the drop (F = mg)
W = mg y
we substitute
P = m g y / t
the terminal velocity of the drop is constant
P = m g v
just want a ride with
Answer:
My best friend lol cuz since quarantine i didn't see her
which is a more scientific way of measuring earthquake? why?
Answer:Earthquakes are measured using seismographs, which monitor the seismic waves that travel through the Earth after an earthquake strikes. Scientists used the Richter Scale for many years but now largely follow the “moment magnitude scale,” which the U.S. Geological Survey says is a more accurate measure of size.
which describes what a velocity/ time graph looks like with no acceleration?
Answer:
A straight line with no slope.
Answer:
C on edge 2021
Explanation:
What would be the net force on an object if the object's acceleration is 0?
Answer:
Explain. yes it is possible because when the net force is zero and acceleration is zero. ... no, Neglecting air friction, the only force acting on this object is the force of gravity downward. There is no force of equal magnitude as the force of gravity acting in the opposite direction.
is
A 0.155 kg arrow is shot upward
at 31.4 m/s. What is its kinetic
energy (KE) when it is 30.0 m
above the ground?
Kinetic energy = 29.912 J
Further explanationGiven
mass = 0.155 kg
vo=initial velocity = 31.4 m/s
h/d=30 m
Required
KE=kinetic energy
Solution
vt²=vo²-2ad⇒vt=final velocity
vt²=31.4²-2.10.30⇒g=10 m/s²
vt²=985.96-600
vt²=385.96 m/s
Kinetic energy (KE)
[tex]\tt KE=\dfrac{1}{2}mv^2\\\\KE=\dfrac{1}{2}\times 0.155.\times 385.96\\\\KE=29.912~J[/tex]
Answer:
The answer is 30.8 (J)
Explanation:
You're welcome
Find the number of moles and the number of molecules in one cubic meter of air at 1 atmospheric pressure and 0C.
Answer:
The number of moles of the air is 4.464 x 10⁻⁴ mole
The number of molecules is 2.688 x 10²⁰ molecules
Explanation:
Given;
pressure of the air, P = 1 atm
volume of the air, V = 1 m³
temperature of the air, T = 0° C = 273 K
The number of moles of the air is calculated as;
PV = nRT
[tex]n = \frac{PV}{RT}[/tex]
where;
n is the number of moles
R is ideal gas constant = 8.2057m³atm/mol.k
[tex]n = \frac{1atm \ \times \ 1m^3}{(8.2057 \ m^3 atm/mol.K)(273 \ K)} = 4.464 \ \times 10^{-4} \ mol.[/tex]
The number of molecules is calculated as follows;
1 mole ---------------------> 6.022 x 10²³ molecules
4.464 x 10⁻⁴ mole ----------> ?
= (4.464 x 10⁻⁴) (6.022 x 10²³ molecules)
= 2.688 x 10²⁰ molecules of air.
Help me with this question please
Answer:
the answer is A, 9.5 units
What is the force on a 1000 kg elevator that is free falling at 9.8 m/s/s?
Answer:
Explanation:
Force = (mass) · (acceleration)
= (1,000 kg) · (9.8 m/s²)
= 9,800 newtons
Refresh the simulation, and then add six protons and six electrons to make a neutral carbon atom. the Mass Number window. What's the mass number of this carbon atom?
Answer:
The mass number of this carbon atom is 12.
Explanation:
Mass number = Number of protons + Number of neutrons = 6 + 6 = 12
Brainlist pls!
Answer:
6
Explanation:
Explain what happens as an object moves through each phase of matter.
ASAP PLEASE ????????
Explanation:
gas vibrate and move freely at high speeds, liquid vibrate, move about and slide past each other. solid vibrate (jiggle) but generally do not move from place to place
which weather change usually occurs when the difference between the air temperature and the dewpoint temperature is decreasing
Answer:
relative humidity increases
Explanation:
hope this helps:)
Write skeleton equations for the following reaction. Write the correct formula in each blank. You do not need to make the subscripts small. For example for carbon dioxide, write CO2
barium chloride ____ + potassium sulfate ____ → barium sulfate _____ + potassium chloride _____ sodium+iron(III) chloride→iron+sodium chloride
Please help me!!
1. BaCl2+K2SO4⇒BaSO4+KCl
2. Na+FeCl3⇒Fe+NaCl
Further explanationGiven
Word equation
Required
Skeleton equation
Solution
A chemical reaction can be expressed in terms of:
words equation the skeleton equation balanced equationThe skeleton equation is still in unbalanced form
So only chemical formulas of reactants and products and the relative amounts of the reactants and products are not included
For example :
• word equation
Ethane + Oxygen ⇒ Carbon dioxide + Water
• skeleton equation
C₂H₆ + O₂ ⇒ CO₂ + H₂O
• balanced equation
2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O
1.
word equation
barium chloride ____ + potassium sulfate ____ → barium sulfate _____ + potassium chloride _____
skeleton equation
BaCl2+K2SO4⇒BaSO4+KCl
2.
word equation
sodium+iron(III) chloride→iron+sodium chloride
skeleton equation
Na+FeCl3⇒Fe+NaCl
The table shows information about four objects resting at the top of a hill.
A 3-column table with 4 rows titled Four Objects at Rest on a Hill. The first column labeled Object has entries W, X, Y, Z. The second column labeled Mass (kilograms) has entries 50, 35, 62, 24. The third column labeled Potential Energy (Joules) has entries 980, 1029, 1519, 1176.
Which object is on the tallest hill?
W
X
Y
Z
It's Z your welcome :)
Answer:
It is Z i believe.
Explanation:
Potential Energy = mass x gravity x height
W: 980 = (50)(9.8)(h)
X: 1029 = (35)(9.8)(h)
Y: 1519 = (62)(9.8)(h)
Z: 1176 = (24)(9.8)(h)
simplify:
W: 980 = 490h
X: 1029 = 343h
Y: 1519 = 607.6h
Z: 1176 = 235.2h
Divide from both sides of each equation:
W: (980/490) = h
X: (1029/343) = h
Y: (1519/607.6) = h
Z: (1176/235.2) = h
Simplify the left side:
W: 2 = h
X: 3 = h
Y: 2.5 = h
Z: 5=h
elements X and Y have atomic number of 11 and 17 respectively. Which one of the elements is a metal?
Answer:
atomic 11
Explanation:
atomic 11 Na is metal
A swing held up by someone at one side has the potential to swing when released.
True
False
A repeating disturbance that transfers energy through matter or space is called a _____.
Answer:
Collateral Damage
Explanation:
Answer:
The answer is Wave
Explanation:
If you could change one rule in soccer, what would it be and why?
A carbon fiber car bumper is hit by another car with the stress of 106,483 Pa. If carbon fiber has a Young's modulus of 228 x 109 Pa, what is the amount of strain it will experience?
Answer:
Stress = 4.67 * 10^-7 N/m²
Explanation:
Young's modulus of the material = Stress/Strain
Given
Young's modulus = 228 x 10^9 Pa
Stress = 106,483 Pa
Required
Strain
From the formula;
Strain = Stress/Young modulus
Strain = 106,483 /228 x 10^9
Stress = 4.67 * 10^-7 N/m²
Cindy pours cool milk into a hot bowl of oatmeal and then stirs it with a room-temperature spoon. Which substance will have heat flow from it to the other substances?
the milk
the spoon
the oatmeal
the surrounding air
Answer:
The OatMeal
Explanation:
Answer:
C.) The Oatmeal
Since the oatmeal is the hottest it will spread the other substances which will increase the temperature of the milk, spoon, and the surrounding air.
The oatmeal had the most thermal energy out of the four options; the milk was cool, the spoon was at room temperature and the surrounding air was also at room temperature. Therefore, the heat from the oatmeal will travel to those substances and change their thermal energy.
Explanation:
Have a great rest of your day
#TheWizzer
If we double the distance between two point charges then coulombs force will
Answer: The size of the force varies inversely as the distance square between the two charges. Thus, if the distance between the two charges is doubled, the attraction or repulsion will become weaker and decrease to one-fourth of the original value. The size of the force shall be proportional to the value of each charge.
Explanation:
Hope This Helps!!! : )
Keep Smiling Have A Good Day/Night!!! : )
Which type of matter is gold an element used in making jewelry A.) A heterogeneous mixture B.) A pure substance C.) A crystalline compound D.) A homogeneous mixture
Answer:
A
Explanation:
The gold used in the making of jewelry is usually not pure but a heterogeneous mixture of metals. Pure gold is quite soft and even though it may look better in appearance compared to those made using heterogeneous mixtures, it usually bends easily. Hence, in order to make the jewelry more durable, gold is usually mixed with other metals to form a heterogeneous mixture.
The correct option is A.
All of the following are kinds of forces except thrust acceleration gravity friction
thrust
acceleration
gravity
friction
Answer:
Acceleration
Explanation:
The choice from the given option which is not a force is acceleration.
Acceleration is defined as the rate of change of velocity of a body with time;
Acceleration = [tex]\frac{change in velocity}{time}[/tex]
Force is a pull or push on a body. The product of mass and acceleration is force.
Thrust is a form of forceGravity is a force acting on bodies with masses. Friction is a force that opposes motion,