Identify two changes in your world that might occur if funding for scientific research were cut drastically
Answer:
Little to no scientific advancement
More wide spread diseases
Explanation:
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. (Given gravity g =9.8 , sin 25° = 0.42 and cos 25° =0.91) What is the maximum height reached by the object at B?
Answer:
Explanation:
a) The formulas for the components Vx and Vy of the velocity and components x and y of the displacement are given by x = V0 cos(θ) Vy = V0 sin(θ) - g t
x = V0 cos(θ) t y = V0 sin(θ) t - (1/2) g t2
In the problem V0 = 20 m/s, θ = 25° and g = 9.8 m/s2.
The height of the projectile is given by the component y, and it reaches its maximum value when the component Vy is equal to zero. That is when the projectile changes from moving upward to moving downward.(see figure above) and also the animation of the projectile.
Vy = V0 sin(θ) - g t = 0
solve for t
t = V0 sin(θ) / g = 20 sin(25°) / 9.8 = 0.86 seconds
Find the maximum height by substituting t by 0.86 seconds in the formula for y
maximum height y (0.86) = 20 sin(25°)(0.86) - (1/2) (9.8) (0.86) 2 = 3.64 meters
b) The time of flight is the interval of time between when projectile is launched: t1 and when the projectile touches the ground: t2. At t = t1 and t = t2, y = 0 (ground). Hence
V0 sin(θ) t - (1/2) g t2 = 0
Solve for t
t(V0 sin(θ) - (1/2) g t) = 0
two solutions
t = t1 = 0 and t = t2 = 2 V0 sin(θ) / g
Time of flight = t2 - t1 = 2 (20) sin(θ) / g = 1.72 seconds.
c) In part c) above we found the time of flight t2 = 2 V0 sin(θ) / g. The horizontal range is the horizontal distance given by x at t = t2.
range = x(t2) = V0 cos(θ) t2 = 2 V0 cos(θ) V0 sin(θ) / g = V02 sin(2θ) / g = 202 sin (2(25°)) / 9.8 = 31.26 meters
d) The object hits the ground at t = t2 = 2 V0 sin(θ) / g (found in part b above)
The components of the velocity at t are given by
Vx = V0 cos(θ) Vy = V0 sin(θ) - g t
The components of the velocity at t = 2 V0 sin(θ) / g are given by
Vx = V0 cos(θ) = 20 cos(25°) Vy = V0 sin(25°) - g (2 V0 sin(25°) / g) = - V0 sin(25°)
The magnitude V of the velocity is given by
V = √[ Vx2 + Vy2 ] = √[ (20 cos(25°))2 + (- V0 sin(25°))2 ] = V0 = 20 m/s
HELP PLEASE: Which option is an example of an object that has potential energy followed by an object that has kinetic energy?
A the fuel in the tank of a car | a car that is parked in a parking lot
B A battery in an electric car | a car parked in the middle of a hill
C A ball held over a person's head | a ball rolling on the floor
D A person riding an elevator | a person in an elevator at the top floor
Answer:
C
Explanation:
Potential energy is energy that something has when its not moving. Kinetic energy is energy in motion. A ball held over a persons head isn't moving, meanwhile a ball in motion is using kinetic energy.
C)A ball held over a person's head | a ball rolling on the floor.
What is an object that has potential and kinetic energy?Objects may have each kinetic electricity and capacity electricity at an equal time. An item may be accelerated above the ground (have capacity electricity) and be shifting at the identical time (and now have kinetic electricity). A baseball, a plane, and a flying chicken are all easy examples of this.
Is light potential or kinetic energy?A rushing bullet, a walking person, and electromagnetic radiation like mild all have kinetic energy. Some other example of kinetic strength is the strength associated with the constant, random bouncing of atoms or molecules.
Learn more about kinetic energy here: https://brainly.com/question/25959744
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Scientific research involves ____ observations that are also repeatable.
A. Interpreting B. Verifying C. Asking
please answer soon
a vector must always have both size and
Answer:direction
Explanation:
A vector must always have both sizes as well as direction, while on the other hand, any scalar quantity such as the mass of an object would only have magnitude but not direction.
What is a vector quantity?The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.
Examples of vector quantities are displacement, velocity acceleration, force, etc.
A scalar number, such as an object's mass, would only have magnitude but not direction, unlike a vector, which must always have both quantities and direction.
To learn more about the vector quantity here, refer to the link given below;
https://brainly.com/question/15516363
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24. What does the atomic number tell you about an atom? What does the mass number tell you about
an atom?
HELP ME ASAPP!
Answer:
Atomic number is the number of protons in the nucleus. The mass number of an atom tells you the total number of protons and neutrons in the nucleus.
A body of mass 10 kg is pulled by a force 8 N. calculate the acceleration and the the final velocity of the body after 5 second.
Which land feature is formed by two oceanic tectonic plates diverging? *
mid-ocean ridge
volcanic island arc
continental volcanoes
continental mountain range
Answer:
mid-ocean ridge
Explanation:
When two oceanic tectonic plates diverge, it means they pull away from each other. When this happens, new land is created where the two plates moved apart.
Answer:
Mid-Ocean Ridge
Explanation:
Just trust me
a dog walks 14 meters to the east and then 20 meters back to the west.
Answer:
who gets theses questions XD
Explanation:
HURRRY PLEASSSEEE 15 POINTS!!!!!
Muscle cells contract as actin filaments slide across the surface of myosin filaments, causing the ends of the muscle cells to pull together. This process requires energy in the form of ATP.
Which process explains how energy is made available for muscle cells?
Muscle cells contract as actin filaments slide across the surface of myosin filaments, causing the ends of the muscle cells to pull together. This process requires energy in the form of ATP. Which process explains how energy is made available for muscle cells?
A) Combining ADP and phosphate group.
B) Combining AMP and phosphate group.
C) Removing the adenine base from ATP.
D) Removing a phosphate group from ATP.
Answer:
c, removing the adenine base from Atp
Answer:
b
Explanation:
What is the magnitude of the relative angle φ
with which the ski jumper hits the slope?
Answer in units of ◦
.
Complete question is;
A ski jumper travels down a slope and leaves the ski track moving in the horizontal direction with a speed of 24 m/s. The landing incline below her falls off with a slope of θ = 59◦ . The acceleration of gravity is 9.8 m/s².
What is the magnitude of the relative angle φ with which the ski jumper hits the slope? Answer in units of ◦
Answer:
14.08°
Explanation:
The time covered will be given by the formula;
t = (2V_x•tan θ)/g
t = (2 × 24 × tan 59)/9.8
t = 8.152 s
Now, the slope of the flight path at the point of impact will be given by the formula;
tan α = V_y/V_x
We are given V_x = 24 m/s
V_y will be gotten from the formula;
v = gt
Thus;
V_y = gt
V_y = 9.8 × (8.152) = 78.89 m/s
Thus;
tan α = 78.89/24
tan α = 3.2871
α = tan^(-1) 3.2871
α = 73.08°
Thus ;
Relative angle φ = α - θ = 73.08 - 59 = 14.08°
A ball is thrown upwards into the air with an initial velocity of
17.5 m/s. What is the maximum height that the ball traveled
during that time (assuming there is no air resistance). Round your
answer to two decimals places.
Answer:
y = 15.61 [m]
Explanation:
To solve this problem we must use the following kinematics equation. We must bear in mind that the acceleration of gravity is negative since the direction of gravity is opposite to the direction of motion.
[tex]v_{f} ^{2} = v_{i} ^{2} -(2*g*y)[/tex]
where:
Vf = final velocity = 0
Vi = initial velocity = 17.5 [m/s]
g = gravity acceleration = 9.81 [m/s^2]
y = height [m]
The final speed is zero, since the ball reaches the maximum height its speed will be zero since it cannot be lifted up more.
0 = (17.5)^2 - (2*9.81*y)
306.25 = 2*9.81*y
y = 15.61 [m]
HELP PLEASE!
write the equation for calculating relative velocity in one dimensional.
Anwer:
Key Equations
Position Vector: `n r (t) = (t)^j+y
Total acceleration: `n a = `n aC
+ `n aT
Position Vector in frame S is the position Vector in frame S` plus the vector from the origin of S to the origin of S`: `n rPS = `n rPS`
+ `n rS`S
Relative velocity equation connecting two references frame: `n vPS = `n vPS`
+ `n vS`S
a book has a mass of 50 kg and an acceleration of 5 m/s/s. what is the force of the book
help asap
Answer:
250 N
Explanation:
F=ma
F=50 kg(5 m/s/s)
F=250 N
Answer:
F=250N
Explanation:
I hope this helps you out and if your feeling generous plz mark brainliest it helps me a lot thank you:)
Anyone know? /——&/&:&:&:!:’dnndndndnd
Answer:
Explanation:
1.25 m/s
A baseball is thrown to a height of 10 m and then falls back and is caught. What is the displacement of the baseball for the entire time period described?
a) -10m
b) 0m
c) 10m
d) 20m
DESPERATE WILL GIVE BRAINLIST
How long does it usually take for a rock to undergo a stage within the rock cycle?
A. a few days
B. from 300 to 400 years
C. about one thousand years
D. thousands to millions of years
Answer: D. thousands to millions of years
Explanation: Stages within a rock's cycle cannot happen quickly. The formation and deterioration can take thousands to millions of years to occur.
I hope this helps!
Good luck <3
An atom has 18 protons and 8 valance electrons. Which statement would best identify this element.
Answer:
argon
Explanation:
an element's atomic number is its number of protons, and argon has 18 protons. it is also a noble gas, which has 8 valence electrons.
hope this helps!
Why do electrons flow in a circuit
Answer:
When a negative charge is brought near one end of a conductor electrons are repelled. ... When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side.
how are open and closed systems related to energy?
Answer:
The stovetop system is open because heat can be lost into the air. A closed system is one that cannot transfer energy to its surroundings.
NEED HELP ASAP WILL MARK BRAINLIEST
Isotopes are _____________.
Compounds
Atoms of the same element but with different mass
Atoms that have a charge
Atoms of different elements
Answer:
A. Atoms of the same element but ith different mass.
Explanation:
Answer: Isotopes are Atoms of the same element but with different mass
Explanation: Atoms of the same element but with different mass
About atoms and molecules plz!?
Answer:
Atoms: They are the smallest part of matter that may or may not exist independently. When atoms come together they form molecules.
Molecules: Many atoms combined either chemically or naturally form molecules. They are the smallest unit of matter that exist independently.
If my answer helped, kindly mark me as the brainliest!!
Thank You!!
Select the correct answer.
A car traveling south is 200 kilometers from its starting point after 2 hours. What is the average velocity of the car?
А.
100 kilometers/hour south
B.
200 kilometers/hour
C.
200 kilometers/hour north
D.
100 kilometers/hour
Answer:
D) 100 kilometres/hour.
Explanation :
Given -
Displacement = 200 kmTime taken = 2 hrs.To find -
Average velocity of the car.Solution -
★ Velocity = displacement/time
→ V = 200/2
→ v = 100 km/h
Therefore, the average velocity of the car is 100 km/h.
in summer, it is cooler in the ground floor than in the top floor of a building. it is because the warm air rises up due to convention. why does warm air rises up?
Answer:
because heat evaporates water
Explanation:
21. Compare and contrast beta particles to the electrons that surround neutral atoms.
UGH HELP MEEE PLSS
Starting from rest, a car travels 18 meters as it accelerates uniformly for 3.0 seconds. What is the magnitude of the car's acceleration? A. 6.0 m/s2 B. 2.0 m/s2 C. 3.0 m/s2 D. 4.0 m/s2
Answer:
D. 4 m/s²
Explanation:
Given;
initial velocity of the car, u = 0
distance traveled by the car, s = 18 m
time of motion of the car, t = 3.0 s
The magnitude of the car's acceleration is given by;
s = ut + ¹/₂at²
s = 0 + ¹/₂at²
s = ¹/₂at²
2s = at²
a = 2s / (t²)
a = ( 2 x 18) / (3²)
a = 4 m/s²
Therefore, the magnitude of the car's acceleration is 4 m/s²
difference between basic units and derived unit
Answer:
Basic units=those units of measurement which do not depend upon any other units are called basic units. Example length, mass, time, current etc.
Derived units=those units which are expressed in terms of fundamental units are called derived units. Example area, volume, density etc.
WHAT IS SLIDING FRICTION
Explanation:
a fraction that is created when we slide something in a motion
does anyone know the answer to this?
Answer:
The cat went up
Explanation:
100 points
And brainliest
A freeway exit curves with a radius of 30 m and a posted speed limit of 17.5 m/s. What is your radial
acceleration if you take this exit at the posted speed?
Answer:
10.21m/s²
Explanation:
Radial acceleration, also known as centripetal acceleration, refers to the acceleration of an object along the circular radius. It can be calculated using the formula:
a(r) = v²/r
Where a(r) = radial acceleration
v = velocity
r = radius of the circular path
According to the information provided in the question, velocity (v) = 17.5m/s, radius = 30m. Hence;
a(r) = v²/r
a(r) = 17.5²/30
a(r) = 10.208333
a(r) = 10.21m/s²
