Answer:
V = -39.2m/s
Explanation:
Given the following data
Time, t = 4secs
Since the rock is falling, we know that the initial velocity = 0
Acceleration due to gravity = 9.8m/s²
To find the final velocity, we would use the first equation of motion
V = U + at
Substituting into the equation, we have
V = 0 + (-9.8*4)
V = -39.2m/s
d) A tank with dimensions: 3m x 2m x 2m contains water upto its half
pertion. What is the pressure at the base of the tank? (density of water
= 1000 kg/m3, g= 9.8 m/s2)
(Ans: 9800 Pa)
Answer:
P = 9800 [Pa]
Explanation:
In order to calculate the pressure at the bottom, we must use the following formula.
P = Ro*g*h
where:
P = pressure [Pa] (units of pascals)
Ro = density of the water = 1000 [kg/m³]
g = gravity acceleration = 9.8 [m/s²]
h = height = 1 [m] (because its half of the portion, the full height is 2 m)
P = 1000*9.8*1
P = 9800 [Pa]
What type of objects exert gravitational pull? (5 points) Only living objects Only space objects All objects having mass All substances that are visible
Answer:
Every object in the universe that has mass exerts a gravitational pull, or force, on every other mass. The size of the pull depends on the masses of the objects. You exert a gravitational force on the people around you, but that force isn't very strong, since people aren't very massive.
Answer:
All objects having mass
Explanation:
What the other guy said
also I took the test!
A student drops a 0.4kg ball from a height a of 49m above the ground. Neglect drag. Answer each of the following questions about the ball during the flight.
What is the magnitude of the net force on the ball?
What is the magnitude of the ball's acceleration?
How long does the ball take to hit the ground?
What is the ball's speed just before striking the ground?
• The only force acting on the ball, and thus the net force, is due to its own weight, with magnitude
w = m g = (0.4 kg) (9.8 m/s²) ≈ 3.9 N
pointing downward.
• The ball is in free fall, so its acceleration is g = 9.8 m/s² (also pointing downward).
• The ball is dropped from a height of 49 m, so its height y at time t is
y = 49 m - 1/2 g t ²
Set y = 0 and solve for t :
0 = 49 m - 1/2 g t ²
t ² = (98 m) / g
t = √((98 m) / g) = √(10) s ≈ 3.2 s
• The ball's velocity v at time t is
v = - g t
so that at the time found previously, the ball will have attained a velocity of
v = - g (3.2 s) ≈ -31 m/s
and thus a speed of about 31 m/s.
Which characteristic does inertia describe
Answer:
Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.
Explanation:
mark me brainlist if i help
Answer:- how difficult it is to change an object's motion
Explanation:
Hope I Helped No Need For Brainliest! :)
A student spots an unknown sample on a TLC plate. After developing in hexanes/ethyl acetate 50:50, he/she saw a single spot with an Rf of 0.55. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?
Answer:
See explanation
Explanation:
A pure sample is known to give one spot on a chromatogram. This is the first indication that the substance is a pure substance. Since the student saw a single spot, the unknown substance is pure.
Subsequently, the substance can be boiled since it is a liquid. Impure substances boil over a range of temperatures. If the substance is pure, it will have a sharp boiling point which can be compared with boiling points of known substances recorded in literature hence the substance can be correctly identified.
The given unknown material or compound is a pure compound - yes, it has only one spot.
In the given TLC plate there is only one single spot found thus we can say it is the pure compound as If an impurity is present along with the major compound then there we could observe more spots other than the major compound.
The verification of the purity of the sample can be tested by a general procedure
conduct the TLC of the given compound and a separate TLC consisting of the pure compoundcompare the Rf values of both platesif it matches with the Rf value of the pure compound then the given compound is confirmed. the TLC plate has no spots other than the main compound therefore, it is a pure one.Thus, The given unknown material or compound is a pure compound - yes, it has only one spot.
Learn more:
https://brainly.com/question/14849710
TRUE OR FALSE!!!!!
PLEASE HELP
Igneous rock is formed by volcanoes releasing magma from the mantle, the rock cools and piles up forming a mountain. Rivers direct water to cool magma underground forming metamorphic rock under lake beds.
Answer:
true
Explanation:
this is true, igneous rocks are formed from molten lava when it cools
Answer: True
Explanation:
Why are bridges built with joints in them?
Answer:
To provide flexibility in the structure to expand and contract temperature variation; also designed to accommodate movement between structures
CAN SOMEONE HELP ME? thank you :)
According to peacemaking criminology, toward which option should a country redirect the money it currently spends on imprisoning criminals?
A.
nuclear technology
B.
stock market
C.
environmental campaigns
D.
private organizations
Answer:
Explanation:
It is C. Environmental campaigns
Answer: environmental campaigns
Explanation:
got it right on the test
An object with a mass of 6.5 kg accelerates 12.3 m/s2 when an unknown force is applied to it. What is the amount of the force?
Answer:
79.95 kgExplanation:
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 = 6.5 × 12.3
We have the final answer as
79.95 kgHope this helps you
The slope on a velocity vs time graph is the _______ of the object.Required to answer. Single choice.
Answer:
the slope of the line on a velocity versus time graph is equal to the acceleration of the object ctto google
The addition of electron shells results in _____
from the nucleus.
shielding of electrons
Answer here
Answer:
shielding of electrons
Explanation:
The addition of electrons shells results in the shielding of electrons away from the nucleus, most importantly the nuclear pull resulting from the charge.
The nucleus pulls electrons to itself due to the net positive charge on it. As more electronic shell is added, the effect of the pull weakens outward. The inner shell experiences the nuclear pull more than the outer shell electrons.The effect is responsible for a wide range of properties of elements.
A closely wound search coil has an area of 3.13 cm2, 135 turns, and a resistance of 61.1 Ω. It is connected to a charge-measuring instrument whose resistance is 44.4 Ω. When the coil is rotated quickly from a position parallel to a uniform magnetic field to one perpendicular to the field, the instrument indicates a charge of 3.44×10−5 C . What is the magnitude of the magnetic field?
Answer:
Explanation:
Let the magnitude of magnetic field be B .
flux passing through the coil's = area of coil x field x no of turns
Φ = 3.13 x 10⁻⁴ x B x 135 = 422.55 x 10⁻⁴ B .
emf induced = dΦ / dt , Φ is magnetic flux.
current i = dΦ /dt x 1/R
charge through the coil = ∫ i dt
= ∫ dΦ /dt x 1/R dt
= 1 / R ∫ dΦ
= Φ / R
Total resistance R = 61.1 + 44.4 = 105.5 ohm .
3.44 x 10⁻⁵ = 422.55 x 10⁻⁴ B / 105.5
B = 3.44 x 10⁻⁵ x 105.5 / 422.55 x 10⁻⁴
= .86 x 10⁻¹
= .086 T .
The articles of confederation represented the Americans distrust of what form of government?
Answer: The Articles of Confederation were against having a strong central government.
Explanation:
explain how water compared to other substance when it comes to a thermal expansion
Momentum:
3
Mass A has a mass of 10 kg while mass B has a mass of 20
kg. Which of these must be true?
Answer:
D
Explanation:
F=ma
a=F/m
according to option D, F is constant
so acceleration is inversely proportional to mass and A has half the mass of B. Hence, acceleration of A will be twice of B if same force is applied.
Determine the acceleration of a boat
with a speed of 18 m/s for 20 seconds.
Answer:
Explanation:
initial velocity, u = 0
final velocity, v = 18 m/s
time = 20 sec
acceleration, a = v - u / t
= 18 - 0 / 20
= 18 / 20
= 9 / 10
= 0.9 m/s^2
Hope this helps
plz mark as brainliest!!!!!!
What does properties mean
Answer:
a thing or things belonging to someone; possessions collectively.
Explanation:
Seeing light coming out from a crack in the wall is what type of wave interaction?
A. Reflection
B. Refraction
C. Diffraction
D. Resonance
Answer:
C
becuase its where a wave (light etc) goes through a narrow area or across an edge of an area
Cookie (the mean cat) runs 20 meters east to kill a bird. He then runs 10 meters
west to bring it back to his owners.
A. What is the distance?
B. What is the displacement?
You should always wear your seatbelt just in case the car comes to an abrupt stop. The seatbelt will hold you in place so that your body does not continue moving when the car stops.
What property of matter will keep your body in motion when the car comes to a halt?
Group of answer choices
inertia
mass
force
acceleration
Answer:
inertia
Explanation:
The property of matter that will keep the body in motion when the car comes to a halt is the inertia force.
Inertia is the ability of a body to remain in static position. It is the tendency to remain in a stable condition where there is no motion.
Newton's first law is the law of inertia and it states that a body remain in a state of rest or of uniform motion unless acted upon by an external force. The ability to remain in state of rest by a body is predicated on the force of inertia.Answer:
inertia
first
Explanation
Carl went on a Euro Trip and was traveling from Spain to Russia. When he looked on the map it said Russia was 7035 km away from Spain. If it took Carl 7 hours to get there, what would his average speed be in meters per second?
Answer:
The average speed would be 279.167 meters per second.
Explanation:
Speed is the magnitude that expresses the variation in position of an object and as a function of time. In other words, speed is defined as the relationship established between the distance traveled and the time elapsed in the movement of a mobile.
Speed can be calculated using the following expression:
[tex]Speed=\frac{distance}{time}[/tex]
In this case:
distance= 7,035 kmtime= 7 hoursSince the required unit of speed is meter per second, then you convert from km to meters for the case of distance, and from hours to seconds for the case of time. So:
distance= 7,035 km= 7,035,000 m (being 1 km= 1,000 m)time= 7 hours= 420 minutes= 25,200 seconds (being 1 hour=60 minutes and 1 minute=60 seconds)Replacing in the definition of speed:
[tex]Speed=\frac{7,035,000 meters}{25,200 seconds}[/tex]
Solving:
[tex]Speed=279.167\frac{meters}{ seconds}[/tex]
Then, the average speed would be 279.167 meters per second.
look at photo please i really need help
Answer:
G. 10N left
Explanation:
Because more newtons are being pulled to the right and there is 10 more then the left side so the extra 10N are going to be pulled to the right
A current of 0.2A flows through a component with a resistance of 40ohms calculate the potential difference
Answer:
8V
Explanation:
Given parameters:
Current = 0.2A
Resistance = 40ohms
Unknown:
Potential difference = ?
Solution:
Potential difference is force that drives current in an electric circuit.
According to Ohms law, it is given as;
V = IR
V is the potential difference
I is the current
R is the resistance
Now, insert the parameters and solve;
V = 0.2 x 40 = 8V
Here we have been given with the amount of current which flows through the component that is 0.2A and resistance that is of 40Ω. So we would be using Ohm's law to calculate the potential difference (V).
★ Ohm's Law :
V = IRHere,
V is potential difference R is resistance I is current★ We have :
R = 40Ω I = 0.2A★ Substituting the values :
>> V = 0.2(40)
>> V = (2 / 10) × 40
>> V = 2 × 4
>> V = 8
★ Therefore,
Potential difference is of 8V.A 12kg cheetah accelerates 24 m/s". What is the force the cheetah needed to run?
Answer:
288N
Explanation:
Given parameters:
Mass of Cheetah = 12kg
Acceleration = 24m/s²
Unknown:
Force needed by the cheetah to run = ?
Solution:
The force needed by the Cheetah to run is the net force.
According to Newton's law;
Force = mass x acceleration
Insert the given parameters and solve;
Force = 12 x 24 = 288N
What will happen if the birth and death rate increased?
Answer:
To know what will happen we first need to know if the birth rate is more or if the death rate is more if the birth rate had a sudden increases above the death rate we would likely face population problems on the other hand if the death rate is increased more than the birth rate we would have less population problems and more food and resources but if the birth and death rate were to increase equally there would just be a standstill in the population
Explanation:
What is molasses?
dye
sugar
brown candy
brown syrup
I need help fast please I will give you extra points
Answer: Brown syrup
Explanation:
Answer:
syrup
Explanation:
The compound cyanogen (CN)2 has covalent bonds shown in this diagram. Starting at left, an N connected by three lines, one above the other, to a C connected by one line to a C connected by three lines, one above the other, to an N. How many electrons are shared between one nitrogen atom and one carbon atom? two three six seven
Answer:
C For a 100% fact!!!! :)
Answer:
I did C on edge and got this correct sooo
Explanation:
the sputnik 1 satellite orbited earth (mass=5.98 x 10^24 kg) in a circle of radius 6.96 x 10^6 m. what was its orbital velocity?
Answer:
v = 4.79 10³ m / s
Explanation:
For this exercise we will use the universal law of gravitation and Newton's second law
F = G M m / r²
where G is the gravitational constant, m the mass of the satellite, M the mass of the Earth, r the distance from the center of the planet to the satellite
F = m a
since the satellite has a circular path, the acceleration is centripetal
a = v² / r
we substitute
G M m / r² = m v² / r
G M / r = v²
We calculate
v² = 6.67 10⁻¹¹ 5.98 10²⁴ / 6.96 10⁶
v = √ (22.94 10⁶)
v = 4.79 10³ m / s
Answer:
7570 m/s
Explanation:
take the square root of: 6.67E-11× 5.98E24/6.96E6
A bus covers 10 km in 7 minutes. Find the speed of the bus in km/h
