Answer:
A) 1.53s
B) 19.8m
C) 2.869m
Explanation:
A) The time of flight for a projectile can be calculated using the formula:
t = 2μsinθ/g
Where; u = velocity
θ = angle
g = acceleration due to gravity (9.8m/s^2)
t = 2 × 15 × sin 30°/9.8
t = 30sin30°/9.8
t = 30 × 0.5/9.8
t = 15/9.8
t = 1.53s
B) The horizontal range (distance) for a projectile can be calculated using the formula:
Range = u²sin2θ/ g
Range = 15² sin 2 × 30 / 9.8
Range = 225 sin 60/9.8
Range = 225 × 0.8660/9.8
Range = 194.855/9.8
Range = 19.8m
C) The maximum height for a projectile can be calculated using the formula:
h = u²sin²θ/2g
h = 15² (sin 30)² / 2 × 9.8
h = 225 × 0.25 / 19.6
h = 56.25/19.6
h = 2.869m
Two 125 kg bumper cars are moving toward each other in opposite directions. Car X is moving at 10 m/s and Car Z at −12 m/s when they collide headon. If the resulting velocity of Car Z after the collision is 10 m/s, what is the velocity of Car X after the collision?
Mass of two bumper cars, m₁ = m₂ = 125 kg
Initial speed of car X is, u₁ = 10 m/s
Initial speed of car Z is, u₂ = -12 m/s
Final speed of car Z, v₂ = 10 m/s
We need to find the final speed of car X after the collision. Let v₁ is its final speed. Using the conservation of momentum to find it as follows :
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
v₁ is the final speed of car X.
[tex]m_1u_1+m_2u_2-m_1v_1=m_2v_2\\\\m_2v_2=m_1u_1+m_2u_2-m_2v_2\\\\m_1v_1=125\times 10+125\times (-12)-125\times 10\\\\v_1=\dfrac{-1500}{125}\\\\v_1=-12\ m/s[/tex]
So, car X will move with a velocity of -12 m/s.
Pls help me it do in 10 minutes !!!!!!
Answer:
473.28m/s^2
Explanation:
ac=4×9.86×75m/ 6.25 =2958m÷6.25=473.28 m/s^2<exponent
i hope this help
dont blame me if im wrong
im only 13 but :) tell me if im wong or not hehe after u know the answer
someone teach me this
what do you mean by MA of lever is 2
Answer:
MA of a lever is 2. It means the lever can lift a load of 2 times heavier than the effort
Which of the following happens to an object in uniform circular motion?
A. it’s velocity changes
b. it’s speed changes
c. it’s centripetal acceleration changes
d. the direction of its velocity stays the same
Answer:its velocity changes
Explanation:
Janayah runs 200 yards in 40 seconds. How fast is she running
Answer:
She is running 5 yards a second Or 300 yards a minute
Explanation:
Divide 200 by 40 to get the rate of speed in seconds
Answer:
≈ 10.23mph
Explanation:
1760yrds in 1 mile
200yrds to miles is:
200/1760 = .1136miles
3600sec in 1 hr
40sec to hours is:
40/3600 = .011111hrs
Now we find her speed in miles per hour:
.1136mi/.01111hrs ≈ 10.23mph
A motorbike is traveling to the left with a speed of 27.0 m s 27.0 s m 27, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when the rider slams on the brakes. The bike skids 41.5 m 41.5m41, point, 5, start text, m, end text with constant acceleration before it comes to a stop. What was the acceleration of the motorbike as it came to a stop?
Answer:
The acceleration of the motorbike as it came to a stop was -8.78 m/s² (NOTE: Negative sign indicates deceleration)
Explanation:
From the question,
A motorbike is traveling to the left with a speed of 27.0 m/s.
This is the initial speed, that is, initial speed = 27.0 m/s
Also, from the question,
The rider slams on the brakes and the bike skids 41.5 m, that is, the bike covers a distance of 41.5 m after the rider slams on the brakes.
Distance = 41.5 m
To determine the acceleration of the motorbike as it came to a stop,
Since, the bike came to a stop, then, the final speed is 0 m/s
From one of the equations of motion for linear motion
v² = u² + 2as
Where v is the final speed (velocity)
u is the initial speed (velocity)
a is the acceleration
and s is the distance
From the question
v = 0 m/s
u = 27.0 m/s
s = 41.5 m
Putting these into the equation
v² = u² + 2as
0² = 27.0² + (2×a×41.5)
0 = 729.0 + 83a
83a = -729.0
a = -729.0 / 83
a = -8.78 m/s² (NOTE: Negative sign indicates deceleration)
Answer:
8.8 m/s^2
Explanation:
Khan Academy answer
Draw the chemical reaction energy diagram for the synthesis of water. Then use the text box tool to write the names or chemical formulas of the reactants and products on the diagram.
Answer:
from plato
Explanation:
In the below diagram of water, H refers to the hydrogen atom and O is the oxygen atom.
For the formation of one water molecule, two hydrogen atoms combine or react with one oxygen atom. They make covalent bonds with each other means mutual sharing of electrons. In the formation of water molecules, the energy is released which tells us that exothermic reaction taking place. In the diagram we can see that first the line is higher but when the reaction is completed the line comes lower which shows that energy is released.
Learn more: https://brainly.com/question/18296054
You launch a model rocket that has a mass of 1 kg. At a height of 500 m, it is
traveling at 120 m/s. What is its kinetic energy at this point?
A. 60 J
B. 14,400 J
C. 7,200 J
D. 29 J
SUBMIT
Answer:
7,200 j
Explanation:
:) :)) :)) :) :)))
Answer:
c. 7,200 J
Explanation:
did the quiz <3
A force of 15 N is used to push a box along the floor a distance of 3 meters. Find the amount of work done.
Answer:
The answer is 45 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distanceFrom the question
force = 15 N
distance = 3 meters
We have
work done = 15 × 3
We have the final answer as
45 JHope this helps you
The marching band organizes 80 students into 6 lines. How many students are in each line and how many students are left over
Answer:
13 students in each line, 2 leftover
Explanation:
12x6=72 add another 1 person to each line. Now you have used 78 students and 2 are leftover.
what is another name for "motion energy"?
Answer:Kinetic energy
Explanation:
When scientists replicate experiments they will often do so under different conditions than the original investigations. Why might this be helpful? Why do you think the astronaut replicated Galileo's investigation on the moon? -This is for science
Answer:
Scientists replicate other scientists' experiments to test if the result of the original investigations being tested should become a law, therefore, meaning if it should be generally accepted or discarded.
However, using different conditions than the conditions used in the original investigations is a method employed by scientists usually to:
1. Check if the values, equipment, used by the original investigations can give similar results if the values are lowered or increased and to also test if the result of the original investigations can be the same even if conditions are adjusted.
2. Check the accuracy of some experimental results especially when those original investigations are the first to speak about a new topic/finding. Definitely, other scientists would use different conditions to provide a broad knowledge and a general acceptance.
Galileo's investigation on the moon rejected popular beliefs of the content of the moon paved the way for further investigations by other astronauts. Galileo performed his investigations with equipment centuries back, coupled with the fact that his investigation didn't support an existing belief that paved the way for his investigation to be replicated by other astronauts.
ellus
A person weighs 784 N on Earth.
On the moon, Gmoon = 1.60 m/s2.
How much would this person
weigh on the moon?
F = [?]N
Hint: Use the gravity of the moon in F = ma.
Answer:
W'=125.44 N
Explanation:
The weight of a person on the surface of Earth is 784 N
Weight is given by :
W = mg
m is mass of the person and g is acceleration due to gravity on the surface of Earth (10 m/s²)
[tex]m=\dfrac{W}{g}\\\\m=\dfrac{784}{10}\\\\m=78.4\ kg[/tex]
The acceleration due to gravity on the surface of Moon, g' = 1.6 m/s²
Weight of the person on the moon is :
W'=mg'
[tex]W'=78.4\ kg\times 1.6\ m/s^2\\\\W'=125.44\ N[/tex]
Hence, the person would weigh 125.44 N on the Moon.
Answer:
129 N
Explanation:
The answer you're looking for is 129 N
Weight on Earth, divide by Earth's gravity (≈9.80), multiplied by the gravity of the Moon (≈1.60).
you already know i dont have much time
Answer:
its option c the age of a fossil can be determined
Which of the following correctly describes the horizontal and vertical
motion of an object projected horizontally with a speed, v, from a
height, h?
constant speed for both horizontal and vertical
acceleration for both horizontal and vertical is increasing
constant acceleration for horizontal: constant speed for vertical
constant speed for horizontal; constant acceleration for vertical
Answer:
The horizontal speed is constant because no forces act horizontally.
There is constant vertical acceleration (g = 9.8 m/s^2) due to the force of gravity.
All of the following protects against flooding except (1 point)
a. dams
b. levees
c. flood sirens
d. evacuation
Answer:B
Explanation:
A car rolls down a hill from rest and reaches a velocity of 18.0 m/s in a distance of 25.0
m. Find the acceleration of the cart.
Answer:
I’m so sorry I tried solving it but I don’t understand it can you explain the question a little bit more ty
Explanation:
In a museum exhibit, three equal weights are hung with
identical wires. Each wire can support a tension of no
more than 75.0 N without breaking. What is the maximum value
that W can be without breaking any wires?
A 50.0 N
B 25.0 N
C 75.0 N
D 35.0 N
Answer:(B) 25.0 N
Explanation:
This is what makes most since. You are wanting to look at the stress of the first wire. 25 *3 for the amount of balls handing of the string you get 75.0 N which is the max the top wire can hold without breaking! Hope this helps!
PLEASE HELP ME ASPAa car travels 500km in 4 hours find its speed in km/h
Answer:
solution
distance travelled : 500km
time taken:4 hour
speed:?
now
speed: distance travelled ÷ time taken
or, 500 ÷ 4
therefor,speed :125km/h
A car is moving with a constant speed of 15 meters per second. What total
distance does the car travel in 90 seconds?
Answer:
The car will of traveled 1,350 meters in those 90 seconds.
Explanation:
Which statement most accurately describes the surface of steel?
Orange juice with pulp floating around is an example of what type of mixture?
Group of answer choices
heterogeneous mixture
homogeneous mixture
Answer:
I hope this helps
Explanation:
homogeneous mixture
A 52 N sled is pulled across a cement sidewalk at constant speed. A horizontal force of 36 N is exerted. What is the coefficient of sliding friction between the sidewalk and the metal runners of the sled?
Answer:
μ = 0.692
Explanation:
In order to solve this problem, we must make a free body diagram and include the respective forces acting on the body. Similarly, deduce the respective equations according to the conditions of the problem and the directions of the forces.
Attached is an image with the respective forces:
A summation of forces on the Y-axis is performed equal to zero, in order to determine the normal force N. this summation is equal to zero since there is no movement on the Y-axis.
Since the body moves at a constant speed, there is no acceleration so the sum of forces on the X-axis must be equal to zero.
The frictional force is defined as the product of the coefficient of friction by the normal force. In this way, we can calculate the coefficient of friction.
The process of solving this problem can be seen in the attached image.
Alex and Izzy are conducting an experiment to see what natural material could best be used for insulating pipes to keep them from freezing in the winter. What is the independent variable of their experiment?
Halley's orbit is a very eccentric (stretched-out) ellipse, so at perihelion Halley's Comet is only about 90 million kilometers from the Sun, compared to more than 5 billion kilometers at aphelion. Does Halley's Comet spend most of its time near its perihelion distance, near its aphelion distance, or halfway in between? Explain.
roxy is driving down east capital. she drives 1380 meters in 45 seconds. assuming she does not speedup or slow down,what is her speed in meters per second ?
Answer:
30.66667
Explanation:
this should be it i did the math
A battery provides a potential difference of 14V. What size current will flow through a 10 ohm resistor in this circuit?
Answer:
I = 1.4 [amp]
Explanation:
To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of the current by the resistance.
Therefore:
V = I*R
where:
V = voltage = 14[V]
I = current [amp]
R = resistance = 10 [ohm]
I = 14/10
I = 1.4 [amp]
Which of the following characteristics do all unicellular organisms share?
Answer:
Asexual production they can be eukaryotes or prokaryotes
Explanation:
If the lift has a maximum power of 5000 W, how much time would it take the lift to
perform 35,000 J of work?
Answer:
T=35,000J/5000W=7s
A 2-kg girl sits on a carousel 0.5 m away from the axis of rotation. If the centripetal force is 80 N, what is the
speed that maintains her circular motion?
Answer:
40M/S
Explanation:
BY CALCULATION USING THE FORMULA S=FD