I WILL GIVE BRAINLIEST
Which two measurements are needed to calculate the velocity of an object?
A. Displacement
O B. Time
C. Acceleration
D. Average speed
PLZ EXPLAIN THE EQUATION AND I WILL GIVE BRAINLIST You are out and about in the country and your father sees a rock that he really wants in the yard. Now you must get the very heavy rock into the back of a truck. The truck bed is 3 feet off the ground. Your father pulls out a 5-foot plank and begins to set up a ramp. At the same time, you (who know about mechanical advantage!) have found a plank that is 8 feet long, and you show it to your father. Which plank will give you the most mechanical advantage? Calculate the MA for each plank
Answer:
The 8 foot long plank
Explanation: hope this helps :)
A player kicks a football from ground level with a velocity of
magnitude 27.0 m/s at an angle of 30° above the horizontal.
What is the horizontal distance the ball travels?
(hint: d= 1/2 at^2)
Answer:
37.33m
Explanation:
To calculate the distance using d= 1/2 at², the time taken for this projectile object (ball) must be calculated.
Time of a projectile = 2u sinθ/ g
Where u = velocity = 27m/s
g = 9.8m/s²
θ = 30°
T = 2usinθ/ g
T = 2 × 27 × sin 30°/9.8
T = 54sin30°/9.8
T = 27/9.8
T = 2.755
T = 2.76s
If the time taken for the ball to move is 2.76s, the distance travelled is:
D = 1/2at²
D = 1/2 × 9.8 × 2.76²
D = 1/2 × 9.8 × 7.6176
D = 74.65248/2
D = 37.33m
The horizontal distance the ball travels is 37.33m
The horizontal distance travel by ball is 37.32 meters.
First we have to calculate time of projectile,
[tex]Time=\frac{2usin\theta}{g}[/tex]
Where g is acceleration due to gravity and u is velocity.
Given that, [tex]u=27m/s, \theta=30[/tex]
Substitute values in above relation.
[tex]Time=\frac{2*27*sin30}{9.8}=\frac{2*27*0.5}{9.8}=2.76s[/tex]
The horizontal distance is given by,
[tex]d=\frac{1}{2}gt^{2}\\ \\ d=\frac{1}{2}*9.8*(2.76)^{2} \\\\d=37.32m[/tex]
Learn more about the projectile motion and velocity here:
https://brainly.com/question/1912408
A bullet is fired horizontally from a 20m tall building. How long does it take to hit the ground
Answer:
t = 2.02 secs
Explanation:
Given the following data;
Height = 20m
We know that acceleration due to gravity, g = 9.8m/s²
To find the time, we would use the formula for maximum height;
H = ½gt²
Substituting into the equation, we have;
20 = ½*9.8t²
20 = 4.9t²
t² = 20/4.9
t² = 4.082
Taking the square root of both sides, we have;
t = 2.02 secs
Therefore, it would take the bullet 2.02 seconds to hit the ground.
Which of the following is true regarding mixtures? a. One substance not combined with any other substances. b. Two or more substances physically mixed and can be separated. c. Two or more substances that are impossible to separate d. One substance that forms a compound alone.
Answer:
aerga
dggzsd
Explanation:
szsdrgzsedg
Unit 2 kinetic energy mastery test
Answer: kinetic energy is Energy of motion.
Explanation:
The diagram shows a box in the periodic table. 15 P Phosphorus 31.0 What is the atomic number of the element shown? A. 46.0 B. 15 C. 31.0 D. 30
Answer:
b 15
Explanation:
the atomic number is the number of the element
A train is travelling at 15 m/s. It accelerates at 3 m/s² for 20 seconds. How far does the train travel in this time?
The distance traveled by the train is 900 m.
The given parameters:
Initial velocity of the train, u = 15 m/sAcceleration of the train, a = 3 m/s²Time of motion, t = 20 sWhat is distance?Distance is a scalar quantity that shows the total path covered by an object.The distance traveled by the train is calculated as follows;
[tex]s = ut + \frac{1}{2} at^2\\\\s = (15 \times 20) + (0.5 \times 3 \times 20^2)\\\\s = 900 \ m[/tex]
Thus, the distance traveled by the train is 900 m.
Learn more about distance here: https://brainly.com/question/23848540
Answer:
900m
Explanation:
Use the equation: acceleration (a) = change in velocity (v – u) / time taken (t)
Rearrange to solve for the final velocity (v):
v = u + at
Substitute in values and solve:
v = 15 m/s + 3 m/s2 × 20 s = 75 m/s
Rearrange the equation for uniform acceleration (v2 – u2 = 2as) to solve for distance (s):
s = (v2 – u2) / 2a
s = ((75 m/s)2 – (15 m/s)2) / (2 × 3 m/s2)
s = (5,625 m2/s2 – 225 m2/s2) / 6 m/s2
s = 5400 m2/s2 / 6 m/s2
s = 900 m
Salmon often jump waterfalls to reach their breeding grounds. Starting downstream, 3.04 m away from a waterfall 0.585 m in height, at what minimum speed must a salmon jumping at an angle of 41.7 ◦ leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s 2 . Answer in units of m/s.
Answer:
V₀ = 5.47 m/s
Explanation:
The jumping motion of the Salmon can be modelled as the projectile motion. So, we use the formula for the range of projectile motion here:
R = V₀² Sin 2θ/g
where,
R = Range of Projectile = 3.04 m
θ = Launch Angle = 41.7°
V₀ = Minimum Launch Speed = ?
g = 9.81 m/s²
Therefore,
3.04 m = V₀² [Sin2(41.7°)]/(9.81 m/s²)
V₀² = 3.04 m/(0.10126 s²/m)
V₀ = √30.02 m²/s²
V₀ = 5.47 m/s
Two types of energy can be either kinetic or potential energy. Identify those two types. For each type, explain why it can be either kinetic or potential. -Help fast i have my test soon!
Answer:
All forms of energy are either kinetic or potential. The energy associated with motion is called kinetic energy . The energy associated with position is called potential energy . Potential energy is not "stored energy".
Explanation:
Two students are discussing gravity. One student says that there is a gravitational attraction between the two
of them. The other student thinks this cannot be true, because he cannot feel any gravitational attraction to
the other student. Which student is correct, and why?
The student says that there is a gravitational attraction between the two of them. This student is correct.
What is gravitational force?The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them, according to Newton's universal law of gravitation.
The gravitational force is weak unless there are massive masses involved. As compared to Earth, humans have relatively low masses, which results in a very small and negligible gravitational force. As a result, although it is tiny and imperceptible, gravitational force exists between two people seated near to one another.
Hence, the student, who says that there is a gravitational attraction between the two of them, is correct.
Learn more about gravitational force here:
https://brainly.com/question/12528243
#SPJ2
Write an equation of the line in slope-intercept form.
I WILL GIVE BRAINLIEST TO THE FIRST PERSON WHO ANSWERS MY QUESTION!
Explain what we know about the center of the universe.
“There is no centre of the universe! According to the standard theories of cosmology, the universe started with a "Big Bang" about 14 thousand million years ago and has been expanding ever since. Yet there is no centre to the expansion; it is the same everywhere”.
Answer:
There is no center of the universe.
Explanation:
According to scientists, the universe started with a "Big Bang" millions of years ago and has been expanding ever since.
Two identical cars are driving along the motorway. Car A is travelling at 50 km/h and Car B is travelling at 80km/h. Which car has the most drag acting on it?
Answer:
i think it is car B because the greater the speed, the greater the drag force acting on the vehicle
Explanation:
The number after oxygen is called a what in this reaction 2AI2O3(s)+energy 4AI(s) +302(g) ??
Will give 15 pointssss need it ASAP.
Answer:
A subscript
Explanation:
it tells you how many oxygen molecules there are in the equation
What happens to the gravitational force between two objects as the bodies become closer to each other? A. The gravitational force begins to repel the objects. B. The gravitational force increases. C. The gravitational force decreases. D. The gravitational force stays the same.
Answer:
Explanation:
The gravitational force between two objects becomes weaker if the two objects are moved apart and stronger if they are brought closer together; that is, the force depends on the distance between the objects.
The gravitational force between two objects as the bodies become closer to each other increases.
Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,
F ∝ m₁.m₂
F ∝ 1/r²
F = G m₁,m₂÷r²
where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².
Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].
As distance decreases the Force increases
To know more about Force :
https://brainly.com/question/30507236
#SPJ2.
Calculate the density of a rock that has a mass of 32 grams and a volume of
4.5 mL.
Answer:
85.2ml
Explanation:
An unknown substance from planet X has a density of 10 g/mL. It occupies a volume of 80 mL. What is the mass of this unknown substance?
Answer:
800 mL
Explanation:
D*V=M
You pick out the numbers as well as what it is they represent from the word problem/explanation, then from there plug them in to the equations. Once you do that, you get your product and have the answer.
10*80= 800
If Newton's third law was true, then why does a table move when I push it? If the table exerted the same amount of force to me, why does it move?
Name three examples of vortices.
don't lie or else ill report
Answer:
The solutions found include vortex rings, bounded vortices attached to the sphere and infinite vortex tubes.
Explanation:
Describe the processes necessary for social learning to occur.
Please HELP!!!!!!!
Answer:
Social learning occurs when four processes are present: 1) Attention: The learning organism must be paying attention to the modeled behavior. If there is no attention, the behavior cannot be processed into memory. 2) Retention: The learning organism must remember the behavior that was modeled.
Explanation:
Hope this helps.
Answer:
Social learning occurs when four processes are present:
1) Attention: The learning organism must be paying attention to the modeled behavior. If there is no attention, the behavior cannot be processed into memory.
2) Retention: The learning organism must remember the behavior that was modeled. If the behavior is not retained, it cannot be replicated.
3) Reproduction: The learning organism must be capable of producing the behavior. If the behavior is too skilled or impossible for the organism to replicate, then the reproduction will be unskilled or halting.
4) Motivation: The learning organism must be motivated to perform the behavior, or motivated not to perform the behavior. If the organism is not motivated to perform the behavior, and even if the organism is able to perform the behavior and knows how, it may not.
A high-speed train in Japan travels a distance of 300. kilometers in 3.60 x 103 seconds. What is the average speed of this train? (Turn the time into hours by using a unit conversion)
Answer:
The average speed is 83.3 m/s
Explanation:
Please help me and I will mark you the brainiest
Answer:
Right direction (i.e towards B).
Explanation:
From the question given above, we can see that the car is accelerating in the left direction (i.e towards D).
Friction is the force that tends to oppose the motion of an object. Since the car is moving in the left direction (i.e towards D) then, the frictional force acting on the wheel will be in the opposite direction i.e right direction (i.e towards B).
Sam stands on a 20 m high cliff and throws a 45 g rock with an initial velocity of 5 m/s [forward] to the water below. Use the conservation of energy to determine the speed of the rock when it has fallen 12 m.
Answer:
v = 12.52 [m/s]
Explanation:
To solve this problem we must use the energy conservation theorem. Which tells us that potential energy is transformed into kinetic energy or vice versa. This is more clearly as the potential energy decreases the kinetic energy increases.
Ep = Ek
where:
Ep = potential energy [J] (units of joules]
Ek = kinetic energy [J]
Ep = m*g*h
where:
m = mass of the rock = 45 [g] = 0.045 [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation = (20 - 12) = 8 [m]
Ek = 0.5*m*v²
where:
v = velocity [m/s]
The reference level of potential energy is taken as the ground level, at this level the potential energy is zero, i.e. all potential energy has been transformed into kinetic energy. In such a way that when the Rock has fallen 12 [m] it is located 8 [m] from the ground level.
m*g*h = 0.5*m*v²
v² = (g*h)/0.5
v = √(9.81*8)/0.5
v = 12.52 [m/s]
What is the density of water?
gram/mL
(fill in the number)
Answer:
1.00 gram per milliliter (1 g/mL). In other words, 1 milliliter of water has a mass of 1 gram. A drop of water is 0.05 mL of water, so its mass would be 0.05 grams.
Explanation:
The mass of the sun is 1.9891030 kg and the mass of the Earth is 5.9721024kg. If the Earth’s acceleration toward the sun is 0.0059 m/s/s, what is the sun’s acceleration toward the Earth?
Answer:
this is the answer according to my calculations
Explanation:
0.001.9
Will mark brainliest!! Answer fast and correct.
Explain how the layers of Earth are organized based on their chemical composition?
Answer:
The. Layers. Of. Earth. Has. Different temperatures so. They. Will. Have. Different. Particles
Explanation:
Mantle outerlayer. Etc. Different (can. I. Have. Brainliest. Please
it 20N to move a box, how much power would be needed to move the box a distance of 5 meters in 5 sec
Answer:
20
Explanation:
Power is work done per time and work done is force times distance. The power is found by multiplying the force(20N) and the distance(5m) and dividing the product by the time(5s)
(20*5)/5=20Nm/s OR 20 watts.
Therefore the power needed is 20 watts.
Answer:
[tex]\boxed {\boxed {\sf 20 \ Watts}}[/tex]
Explanation:
Power can be found by multiplying the force by the distance, then dividing by time.
[tex]P=\frac{F*d}{t}[/tex]
The force is 20 Newtons. The distance is 5 meters. The time is 5 seconds.
[tex]F=20 \ N \\d= 5 \ m \\t= 5 \ s[/tex]
Substitute the values into the formula.
[tex]P=\frac{20 \ N \ * \ 5 \ m}{5 \ s}[/tex]
First, solve the numerator.
20 N * 5 m = 100 N*m 1 Newton-meter is equal to 1 Joule. Therefore, our answer of 100 N*m is equal to 100 J.[tex]P=\frac{100 \ J }{5 \ s }[/tex]
Divide.
100 J/5 s= 20 J/s 1 Joule per second is equal to 1 Watt. Therefore, our answer of 20 J/s is equal to 20 W.[tex]P=20 \ W[/tex]
The power to move the box is 20 Watts.
A skydiver jumps from a plane and falls for 5 seconds before reaching his terminal velocity. During this 5 seconds interval, describe his acceleration before reaching terminal velocity?
Answer:
His acceleration during the first five seconds before reaching terminal velocity = (W - D)/m
Explanation:
The terminal velocity is the maximum steady velocity attained by a body falling freely with increasing velocity from rest in a fluid, such as air or water
The net force, F acting on the body falling through the fluid is given as follows;
F = Weight force, W, from gravity - Drag force, D, from the fluid
F = W - D
Given that F = Mass, m × Acceleration, a, we have;
F = m × a
The acceleration, a = F/m = (W - D)/m
His acceleration during the first five seconds before reaching terminal velocity = (W - D)/m.
PLEASE HELP DO IN 20 MIN WILL MARK BRAINLIEST PLEASE SHOW WORK!
Let's say someone throws a candy bar of their choice at a wall which is set as the positive direction with a velocity of 28.0 m/s. After it hits the wall, it takes 0.020 s to stop. What is the acceleration (in m/s^2) of the candy bar when it hits the wall?
Answer:
6997200
Explanation:
plz mark as the brainliest