Answer:
A
,
alll true
Explanation:
A rock is dropped from a cliff 80m above the ground. How long does it take to reach the ground ?
Answer:
4.04 s
Explanation:
From the question given above, the following data were obtained:
Height (h) = 80 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
The time taken for the rock to get to the ground can be obtained as shown below:
h = ½gt²
80 = ½ × 9.8 × t²
80 = 4.9 × t²
Divide both side by 4.9
t² = 80/4.9
Take the square root of both side
t = √(80/4.9)
t = 4.04 s
Thus, it will take 4.04 s for the rock to get to the ground.
A hockey puck slides across the ice at a constant speed.
Which of the following is true?
1. It is in equilibrium.
2. The puck is at rest.
3. The puck is moving and thus not in equilibrium.
4. None of these
5. The puck can be considered neither at
rest nor in equilibrium.
As a hockey puck slides across the ice at a constant speed, it is n equilibrium. The correct option is 1.
What is equilibrium?Chemical equilibrium is the condition in which both the products and reactants are prevalent in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.
When a reaction and its reverse reaction proceed at the same rate, this is referred to as chemical equilibrium.
Both forward and reverse reactions occur as a system approaches equilibrium. The forward and reverse reactions are proceeding at the same rate in equilibrium.
It is in equilibrium because it achieves dynamic equilibrium by moving in a straight line at constant speed. The net forces are equal to zero.
Thus, the correct option is 1.
For more details regarding chemical equilibrium, visit:
https://brainly.com/question/4289021
#SPJ2
)A ball is hit straight up with an initial speed of 50 meters per second. What is the speed of the ball 3 seconds after it is hit? [Neglect friction.]
Answer:
The velocity of the ball after 3 seconds it is hit, is 20.6 m/s
Explanation:
Given;
initial velocity of the ball, u = 50 m/s
time of the upward motion of the ball, t = 3 seconds
The velocity of the ball after 3 seconds is calculated by applying the following kinematic equation;
v = u - gt
where;
g is acceleration due to gravity = 9.8 m/s²
v = 50 - (9.8 x 3)
v = 50 - 29.4
v = 20.6 m/s
Therefore, the velocity of the ball after 3 seconds it is hit, is 20.6 m/s
A soccer ball kicked with a force of 14.7 N
accelerates at 7.3 m/s2 to the right.
What is the mass of the ball?
Answer in units of kg.
Answer:
The answer is 2.01 kgExplanation:
The mass of the ball can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
where
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{14.7}{7.3} \\ = 2.01369863...[/tex]
We have the final answer as
2.01 kgHope this helps you
Answer:
The answer is 2.01 kg.
Explanation:
PLEASE HELP WILL MARK A BRAINLIEST
Which statement about polymers is true?
A. Polymers are substances that have relatively large molecules.
B. Oil and gas are the starting materials for making all polymers.
C. Fabrics such as cotton and silk are synthetic polymers.
D. All polymers are obtained from living organisms.
Answer:
The answer is (A) "Polymers are substances that have relatively large molecules."
Polymer, any of a class of common or synthetic substances made out of very large molecules, called macromolecules, that are products of less complex synthetic units called monomers. Polymers make up a considerable lot of the materials in living beings, including, for instance, proteins, cellulose, and nucleic acids. In addition, they constitute the premise of such minerals as diamond, quartz, and feldspar and such man-influenced materials as solid, glass, to paper, plastics, and rubbers.
Answer:
I hope this helps
Explanation:
The displacement during the interval from t = 0 s and t = 4 s is 10 m 10 m 20 m 20 m 25 m 25 m 40 m 40 m cannot be determined without knowing starting point
Answer:
Cannot be determined
Explanation:
Given
Interval: 0s to 4s
Required
Determine the displacement
The given information (i.e. time interval) can not be used to determine the displacement of the body.
To solve for displacement, we need the starting point, the direction moved and the distance moved in each direction.
So, it's either the question is incomplete or the answer to the question is option (e) cannot be determined
explain what happens when two light waves traveling from the same direction of displacement meet.
Hint: think about how the crests and troughs of these waves might be affected
Answer:
They hit each other
Explanation:
A point charge with charge q1 = 4.00 μC is held stationary at the origin. A second point charge with charge q2 = -4.20 μC moves from the point ( 0.135 m , 0) to the point ( 0.250 m , 0.250 m ). How much work W is done by the electric force on the moving point charge? Express your answer in joules. Use k = 8.99×109 N⋅m2/C2 for Coulomb's constant: k=14πϵ0. View Available Hint(s)
Answer:
The value is
Explanation:
From the question we are told that
The first charge is [tex]q_1 = 4.00 \mu C = 4.00 *10^{-6} \ C[/tex]
The second charge is [tex]q_2 = -4.20 \mu C = - 4.20 *10^{-6} \ C[/tex]
The position of the first charge is [tex](x , y) = (0\ m,0\ m )[/tex]
The initial position of the second charge is [tex](x , y) = (0.135 \ m , \ 0 )[/tex]
The final position of the second charge is [tex](x , y) = (0.250 \ m , \ 0.250 \ m )[/tex]
Generally the electric potential energy of the second charge at initial position is mathematically represented as
[tex]E_1 = \frac{k * q_1 * q_2 }{ r}[/tex]
Here [tex]r= 0.135 \ m[/tex]
So
[tex]E_1 = \frac{8.99 *10^{9} * 4.00 *10^{-6} * (-4.20 *10^{-6}) }{ 0.135}[/tex]
=> [tex]E_1 = -1.119 \ J[/tex]
Generally the electric potential energy of the second charge at initial position is mathematically represented as
[tex]E_2 = \frac{k * q_1 * q_2 }{ r}[/tex]
Here [tex]r= \sqrt{0.250^2 + 0.250^2}[/tex]
=> [tex]r= 0.3536[/tex]
So
[tex]E_2 = \frac{8.99 *10^{9} * 4.00 *10^{-6} * (-4.20 *10^{-6}) }{ 0.3536}[/tex]
=> [tex]E_2 = - 0.4271 \ J[/tex]
Generally the workdone is mathematically represented as
[tex]W = E_2 - E_1[/tex]
=> [tex]W = -0.4271 - (-1.119 )[/tex]
=> [tex]W = 0.6919 \ J[/tex]
if you are pushing a box with a force of 200n and there is a force of 7 n on the box due to sliding friction, what is the net force on the box
A car is traveling at a constant speed of 24 meters per second when all of a sudden the driver notices a deer 60 meters in front of him. Given that he has a reaction time of 1.2 seconds and that he can slow down at a rate of 6 m/s2, does he hit the deer? If so, at what speed does he hit the deer?
Answer:
[tex] {v2 }^{2} - {v1}^{2} = 2a(x2 - x1)[/tex]
[tex] - {24}^{2} = 2( - 6)(x2)[/tex]
[tex]x2 = 48[/tex]
x2 is distance after slow down. now we should calculate distance of reaction time.
[tex]d = tv[/tex]
[tex]d = (1.2)(24) = 28.8[/tex]
d + x > 60 ==> he hits the deer. now calculate hit speed.
[tex] {v2}^{2} - {24}^{2} = 2( - 6)(31.2)[/tex]
[tex] {v2}^{2} = 201.6[/tex]
HELP ASAP!!!!!
7. Describe two events that occur on Earth that you
would not expect to find on Mars because of the
lack of plate movements.
Answer:
life, the core of mass is made of iron, sulphur i think
What would be the mass of a rock falling from the sky if it hits the ground with a force of 98 N?
Assuming you're using the approximation g = 9.8, this means 9.8x is the force of the rock when it hits the ground. Set this equal to 98 and solve for x
9.8x = 98
x = 98/9.8
x = 10
The mass of the rock is 10 kilograms
The mass of a rock falling from the sky if it hits the ground with a force of 98 N will be 9.89 Kg.
What is mass?Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.
The force is given as;
[tex]\rm F=mg \\\\ m = \frac{F}{g} \\\\ m = \frac{98}{9.81} \\\\ m = 9.989\ Kg[/tex]
Hence the mass of a rock falling from the sky if it hits the ground with a force of 98 N will be 9.89 Kg.
To learn more about the mass refer to the link;
https://brainly.com/question/13073862
Platform diving in the Olympic Games took place at a height of 10 meters. a. What is the velocity of a diver entering the water from the platform if he steps off the platform? b.How much time does it take the diver to reach the water from the platform?
Answer:
a)14.0m
b) 1.43s
Explanation:
Using the equation of motion to find the velocity
S = ut+1/2gt²
10= 0+1/2(9.81)t²
10 = 4.905t²
t² = 10/4.905
t² = 2.0387
t = √2.0387
t = 1.43secs
Next is to calculate the velocity using the formula:
v = u+gt
v = 0+(9.81)(1.43)
v = 14.0m/s
Help number 3 ASAP !!!
Two animals of differing masses are in free fall.
Which factor is missing so that both animals fall with the exact same velocity ?
Momentum
Interia
Gravity
Air resistance
Answer:
i would say Momentum
Explanation:
because they need the quantity of motion
Which one of Newtons laws of motion best explains why the dishes do not move when the table cloth is removed?
AND
A rocket lifting off the ground into space can be explained by (which one of newtons laws?)
Answer:
1. Newtons first law (everything in motion/rest stays in motion/rest untill acted up by and unbalanced force).
2. Newtons third law (every reaction has an equal and opposite reaction)
Explanation:
what is the frictional force needed to slow an object in motion
Answer:
kinetic friction
Explanation:
What is the mass of a 7500N car on earth?
Answer:
Weight of the car F = m*g ; Here, g = 9.81 N/kg ;
So, we can find from the formula mentioned above m = F/g ;
Mass m is equal about 764 kg.
Explanation:
Distance vs. Time
80
70
60
B
50
Distance (m)
40
А
30
20
10
10 20
30 40 50
Time (s)
60
70
80
1. How far has the student walked in 25 seconds?
2. Describe the motion of the student from 25 seconds to 60 seconds.
3. How long did it take the student to walk 40 meters?
4. What is the independent variable?
5. What is the dependent variable?
Answer:
1. 50m
2. they are motionless
3. 20s
4. time
5. distance
Which types of rocks (igneou, sedimentary, metamorphic) tend to have crystalline textures? How does this texture form?
Answer:
metamorpic rock
Explanation:
it has a crystallin textures
the si unit of heat energy
Answer:
joule is its si unit in my opinion
The total Kinetic and Potential energy of all the particles in an object is called
Answer:
Internal energy
Explanation:
1. A wagon, initially traveling at a constant 9.7 m/s, starts going down a hill that creates an acceleration of 4.8 m/s2.
What is the wagon's velocity 6.9 s after it starts accelerating down the hill?
Answer: 24 m/s
Explanation:
A rocket is shot out of a navy battleship to test a new rocket. It takes 16 seconds for the rocket
to reach its destination after leaving the barrel. If its final velocity was found to be 200 m/s,
then what was the rocket's acceleration?
A. 8m/s squared
B. 12 m/s squared
C. 12.5 m/s squared
D. 16m/s squared
just answer this plzz
C, i know this trust me
A moving object has 20 Joules of potential energy and has a mass of 10 kilograms. How fast is the object moving in meters per second?
PLEASE HELP ASAP WILL GIVE 10 PTS
Which item is made from a synthetic material?
A. cotton pants
B. leather jacket
C. tissue paper
D. wicker basket
Answer: A. Cotton Pants
Explanation:
Answer:
A
Explanation:
A car started its motion from rest and accelerated for 6 seconds, with the acceleration of 4 m/s2. Then it decelerated for 5 seconds, with the acceleration of -1.6 m/s2. What was the velocity of the car after 6+5 seconds?
I NEED LOTS OF HELP ON THIS
Which of the following most likely describes a Group 10 element?
O Good conductor of heat
O Gas at room temperature
O A member of the carbon group
O Poor conductor of electricity
Answer:
A. Good conductor of heat
Explanation:
The group 10 elements are a group of chemical elements as part of VIII elements and they include nickel, platinum, palladium etc. These group of chemical elements are all d-block transition metals, highly ductile and lustrous and are mostly white to light grey in color.
The statement which most likely describes a Group 10 element is that they are good conductor of heat because they have some of the chemical and physical properties of metals.
Which equation correctly represents the gravitational potential energy of a
system?
Answer:
I don't really understand what you are asking but... i can try to help
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
Hope this helps sorry I couldn't answer it☺️