Answer:
Explanation:
River is 7.5 m wide . Time taken by it cover this displacement
= displacement / velocity
= 7.5 / 0.4
= 18.75 s
During this period , swimmer will have a displacement of 30 m due to velocity of river water .
Displacement of 30 m downstream will be due to flow of river .
velocity of water flow = displacement / time
= 30 / 18.75
= 1.6 m /s
Billy, a mountain goat, is rock climbing on his favorite slope one sunny spring
morning when a rock comes hurtling toward him from a ledge 40.0 m above.
Billy ducks and avoids injury. a) How fast is the rock traveling when it passes
Billy? b) How does this speed compare to that of a car traveling down the
highway at the speed limit of 25 m/s (equivalent to 55 mi/h)?
Answer:
There is not enough information to solve how fast the rock was traveling
They are both very fast, as mountain goats are very fast, and if he ducks, he was faster than the rock. The speed compares
Explanation:
I did find this tho.
This question can be solved by using the law of conservation of energy.
a) The rock is traveling at "28 m/s" when it passes billy.
b) The speed of the rock is "1.12 times" the speed of the car.
a)
We can find the speed of the rock by using the law of conservation of energy:
Loss of Potential Energy = Gain in Kinetic Energy
[tex]mgh = \frac{1}{2}mv^2\\\\2gh = v^2\\v = \sqrt{2gh} \\\\[/tex]
where,
v = speed of the rock = ?
g = acceleration due to gravity = 9.81 m/s²
h = height = 40 m
Therefore,
[tex]v = \sqrt{2(9.81\ m/s^2)(40\ m)}[/tex]
v = 28 m/s
b)
Now, we find the ratio between the speed of the rock and the speed of the car:
[tex]\frac{speed\ of\ rock}{speed\ of\ car} = \frac{28\ m/s}{25\ m/s}\\\\speed\ of\ rock = (1.12)speed\ of\ car[/tex]
Learn more about the law of conservation of energy here:
https://brainly.com/question/20971995?referrer=searchResults
The attached picture explains the law of conservation of energy.
A rock is thrown off a cliff with a horizontal velocity of 18.3 m/s. Right before it hits the ground, it has a vertical velocity of -31.3 m/s. What is the magnitude of the rock's overall velocity?
Answer: 36.257 m/s
Explanation:
The vertical and horizontal components of a projectiles motion are completely independent of each other. The only thing they share is the amount of time in the air. Because they are independent, the acceleration of gravity cannot affect the horizontal acceleration. This means horizontal acceleration is 0. If the acceleration is 0, this means the velocity does not change horizontally. So the final velocity of the x component is equal to the initial.
Now if you actually imagine these two vectors, it forms a right triangle. So you can use the Pythagorean Theorem to find the resultant vector.
[tex]a^2+b^2=c^2\\18.3^2+(-31.3)^2 = c^2\\c = 36.257 m/s[/tex]
A dog walks a distance of 55.5 meters in 120 seconds. What was its speed?
A car travels 600 seconds at a speed of 25 m/s. How far did it go?
How long will it take a toy car to travel a distance of 1500 m at a speed of 3 m/s?
A car travels a distance of 9999 m in 3600s. What was its speed?
A sailboat travels a distance of 8080 m in 7200 seconds. What speed is it going?
What distance will a car traveling at a speed of 5.5 m/s cover in 0.25 s?
How long will it take a ball to roll 10 meters along the floor at a speed of 0.11 m/s?
Show work pls
Answer: ...
Explanation: 1: The dog is walking 0.4625MPS (Meters per second. M/S)
To calculate speed you divide the distance by time so 55.5 Meters/120 Seconds is 0.4625 MPS
2: The car traveled 15 KM
To calculate speed you need to multiply the speed by time. (Since it's multiplication it can be put in any order) So 600 Secondsx25 Meters is 15,000 M which is 15 KM.
3: It would take 8 Minutes and 20 Seconds to travel 1500 Meters.
To calculate the time you multiply Speed by distance (Order doesn't count.)
So 1500 Metersx3 MPS is 8 Minutes and 20 seconds.
4: It was going 2.7775 MPS.
To calculate the speed you divide the distance over time. So 9999 Meters/3600 seconds is 2.7775 MPS.
5: It was going 1.1222... (Infinite)
To calculate the speed you divide the distance over time
So 8080 Meters/ 7200 Seconds is 1.222...
6: It would cover 1.375 Meters.
To calculate the Distance you multiply Speed by time (Order doesn't count.)
So 10.25 Secondsx5.5 MPS is 1.375 Meters.
7: It would take 1 Minute and 31 Seconds to travel 10 Meters.
To calculate the time you multiply Speed by distance (Order doesn't count.)
So 10 Metersx0.11 MPS is 1 Minute and 31 seconds
Hopes this helps because this took over 10 minutes.
Vector L is 303 m long in a
205º direction. Vector M is
555 m long in a 105° direction.
Find the magnitude of their
vector sum
Answer:
584.32m
Explanation:
Firstly, we need to find the x and y components of each vector.
x-component for vector L=303cos205°=-274.61
y-component for vector L=303sin205°=-128.05
x-component for vector M=555cos105°=-143.64
y-component for vector M=555sin105°=536.09
Since it's the vector sum, we add the x and y components of each vector.
Resultant vector x-component -274.61+(-143.64)=-418.25
Resultant vector y-component -128.05+536.09=408.04
Now, to find the magnitude, we use the formula [tex]\sqrt{x^{2}+y^{2}}[/tex]
sqrt(-418.25^2+408.04^2)=584.32m
Check my work for errors just in case.
The gravitational force of the Earth on the Moon is 1.99 x 1020 N.
If the mass of the Moon is 7.34 x 1022 kg, what is the acceleration
of the Moon?
Explanation:
ANSWER
g
m
=
R
2
GM
1.4=
R
2
(6.667×10
−11
)(7.34×10
22
)
R=
1.4
6.667×10
−11
(7.34×10
22
)
=
34.95×10
11
=1.87×10
6
m
HOPE IT'S HELP AND PLZ FOLLOW ME
A boy runs 400m at an average speed of 4.0m/s he runs the first 200m in 40 s how long does he take to run the second 200m?
if the boy runs 400m at an average speed of 4.0m/s he runs the first 200m in 40 at the same speed he will cover next 200m in 40 s and the the average speed is of 4.0m
What is angular speed ?Angular speed is a measures of speed of how fast the central angle of a rotating body changes with respect to given time
It mainly implies how quickly the object is rotating means it is described as the change in the angle of the object per unit of time.
To calculate the speed the value of angular speed are needed thus angular speeds formula is used to calculate the distance traveled by an object in terms of rotation and revolutions per unit of time.
The unit of angular speed of an object is denoted as radian per second and Both angular speed, angular velocity are calculated by using the same formula.
For more details speed, visit
https://brainly.com/question/7359669
#SPJ2
Unlike secondary pollutants,
pollutants are
released directly into the air by natural processes or by human
activities
Answer:
True
Explanation:
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
List 3 objects that would sink in water & 3 object that would float in water :)
Answer:
items that would sink : spoon marbles rocks
Explanation:
items that would float : straw feather cotton
What is population education?
Answer:
Is all about people – how many of us there are, how we shape the world around us, and how we interact with each other.
Explanation:
Answer:
Population is derived from French word "populous" meaning 'people' so population is study of people living together and education is life long knowledge.
Explanation:
sana makatulong
what causes list development of a country ?why is Nepali still one of the least developed countries? write in points
if you walk 8km at an average speed of 4km/h, how much time does it take
Answer:
2 hours
Explanation:
If a 25 kg object is moving at a velocity of 5 m/s, the object has energy
Answer:
Since the KE is proportional to velocity squared, if you increase the KE by a factor of
2
, you increase
v
by a factor of
2
2
=
4
Detailed explanation :
25
=
0.5
⋅
m
⋅
(
5
2
)
Find
m
:
25
=
25
m
2
m
=
2
Hence the new KE:
KE
=
0.5
⋅
2
⋅
10
2
KE
=
100
J
How far will a 50 N crate be moved if 500 J of work are accomplished?
plz help i beg, veryyy confused :)
help me please asap :(
Placing ice on a sprained ankle this is an example of conduction, convection, radiation?
It is considered aerobic dance if you dance 3-4 times a week for at least 45 minutes each time.
Question 2 options:
True
False
Answer:
yes
Explanation:
yes
So I just did the quiz and I just guessed cause I couldn't find a straight answer but I was right. the answer is
TRUE
~
YES, it was considered aerobic dance if you dance 3-4 times a week for at least 45 minutes each time.
Which is an example of nuclear energy being converted into heat and light?
A a volcano
B The sun
C A rocket engine
D A coal burning power plant
Answer:
D. A coal burning power plantExplanation:
it is a coal power plant , nuclear power is economical and does not fluctuate as much as wind or solar power.
Unlike coal, it is considered clean in terms of the amount of greenhouse gas emissions produced by the power plant itself, although uranium mining and processing are not without risks and environmental impact
How will you describe the motion of an object in a balanced and unbalanced
state? ASAP
Answer:
Objects move according to their net force, or the total amount of force acting on them. Balanced forces are just that, balanced. An object with balanced forces will not move because the opposing forces will cancel each other out. However, if there are unbalanced forces, the object will move in accordance with the force that is greater. When moving though, there is always friction. Whether you be underwater, on the ground, or in the air there is always friction on the Earth. (Besides vacuums, of course.)
Force is equal to mass x acceleration.
With that you can find the forces of the object if you know its mass and acceleration.
Explanation:
The motion of an object can be described in many ways, including path, speed, velocity, and acceleration.
3
Select the correct answer
A kilogram is an si unit. Which quantity might you measure in kilograms?
О А.
temperature
B.
mass
C. length
D.
electric current
Reset
Next
Answer:
mass
.
Explanation:
Answer:
It would be B
Explanation:
Contact forces & friction. Please help!!! (20 points & brainliest!)
Let w denote the weight of the box, n the magnitude of the normal force (the sheet pushing up on the box), k the magnitude of the kinetic friction force, and µ the coefficient of kinetic friction.
The kinetic friction force doesn't kick in until the sheet is tilted at an angle θ₂. Since the box is sliding down at constant speed, it's in equilibrium and the forces acting on it sum to 0.
In the horizontal direction (literally left-and-right, parallel to the ground and not the sheet), we have only the horizontal components of the friction and normal forces to worry about, so that [tex]\mathbf n_x+\mathbf f_x=\mathbf0[/tex], which reduces to
f cos(θ₂) + n cos(90º + θ₂) = 0
(where we take the right to be positive and left to be negative)
Recall that cos(90º + x) = -sin(x) for all x, and that the friction force is proportional to the normal force by a factor of µ. This gives
µ n cos(θ₂) - n sin(θ₂) = 0
Solve for µ :
µ n cos(θ₂) = n sin(θ₂)
µ = sin(θ₂) / cos(θ₂)
µ = tan(θ₂)
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.
A Galapagos tortoise weighs 59 Newtons (on Earth). What is its mass in kilograms?
Answer:
It is 6.02 kilograms.
Explanation:
One kilogram is equal to 9.81 Newtons. To convert Newtons to Kilograms,divide by 9.81. For instance, 20 Newtons would be equivalent to 20/9.81 or 2.04 kilograms
The image below shows the same egg in water (on the left) and in seawater (on the right). What must be true about these liquids?
a
The seawater is less dense than the plain water
b
The seawater is denser than the plain water
c
The plain water and the seawater have equal densities
d
It is impossible to tell which liquid is denser
Answer:
C
Explanation:
the correct answer is C
What is the fastest speed at which a tennis ball can cross the net horizontally and still land in the court? From the net to the end line is 12 m, and the height of the net is 1 m. Neglect air resistance and spin on the ball.
A. 0.04 m/s
B. 27 m/s
C. 53 m/s
D. 45 m/s
self note *6
Answer:
B. 27 m/s
Explanation:
The horizontal velocity of the ball is 27 m/s
The given parameters;
horizontal distance, x = 12 mheight of the net, h = 1 mThe time of motion is calculated as;
h = ut + ¹/₂gt²
1 = 0 + (0.5 x 9.8)t²
1 = 4.9t²
[tex]t^2 = \frac{1}{4.9} \\\\t^2 = 0.205\\\\t = \sqrt{0.205} \\\\t = 0.45 \ s[/tex]
The horizontal velocity of the ball is calculated as;
X = uₓt
[tex]u_x = \frac{X}{t} = \frac{12}{0.45} = 26.7 \ m/s \ \approx 27 \ m/s[/tex]
Thus, the horizontal velocity of the ball is 27 m/s
Learn more here:https://brainly.com/question/9606019
How far can a person run in 13.22 minutes if he or she runs at an average speed of 12.33 km/hr?
Answer:
2.72 km
Explanation:
(12.33 km)/ 1 hr * (1 hr)/ 60 min
0.2055 km/ min
distance=rate * time (assuming v is constant,
a=0)
(0.2055 km/ min)*(13.22 min)
2.72 km OR 2716.71 m
Describe the three particles that make up an atom (name, charge, and location in the atom).
Answer:Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
An object at rest has equal forces acting on it. This can be described as a(n) _____________ force.
gravity
unbalanced
balanced
physical
Acceleration
A car traveling to the right speeds up from Okm/h to 50km/h in 8s. Convert the time from seconds to minutes.
Explanation:
Initial speed, u = 0 km/h
Final sped, v = 50 km/h
Time, t = 8 s
1 minute = 60 seconds
⇒ 1 s = (1/60) minutes
⇒8 s = 0.1334 minutes
Acceleration,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{50\cdot\dfrac{5}{18}}{8}\\\\a=1.73\ m/s^2[/tex]
Hence, this is the required solution.