Answer:
the average speed on this trip is 75 km/h
Answer:
75 km/h
Explanation:
9. Suppose you want to calculate how much
work it takes to lift a 160 N barbell. Besides
the mass of the barbell, what other
information do you need to know?
a.the shape of the weights
b.how high the barbell is being lifted
c. the strength of the person doing the lifting
d.the volume of the barbell
Answer:
The correct option is;
b. How high the barbell is being lifted
Explanation:
The work done in lifting the 160 N barbell is equal to the potential energy gained by the barbell in the final elevated position of the barbell
Therefore, in order to find the work done to lift the barbell, we can calculate the potential energy gained by the barbell when it is placed at height
The work done to lift the barbell = The potential energy, P.E., gained by the barbell
The potential energy of an object, P. E. = The mass of the object, m × The acceleration due to gravity, g × The height to which the barbell is lifted, h
∴ Mathematically, P.E. = m × g × h
Weight, W = Mass, m × The acceleration due to gravity, g
The weight, W of the barbell is given as W = 160 N
∴ W = m × g = 60 N
From which we have;
P.E. = m × g × h = W × h
∴ The work done to lift the barbell = P.E. = 60 N × h = 60 N × The height to which the barbell is lifted.
Therefore the information which need be known is the height to which the barbell.
In an attempt to deliver a parcel on time,the dispatch rider had to ride 10 kilometers 15 degrees south east ,he then rode 11 kilometers 30 degrees north east and then takes a shortcut at 22 kilometers Find the rider's displacement
Answer:
D = 4.05 km
Explanation:
In this case, it's really neccesary to analyze the given data.
First, the rider goes 10 km SE 15°. Then 11 km 30° to the NE direction. Then, he dispatch the order, and then, takes a shorcut to get back at 22 km heading W (This is the missing data of your exercise).
According to all these data, we have the magnitude of the displacement in each part of the travel, but to know the displacement we need to know the x and y components of these magnitudes, so we can really know the total displacement of the rider.
Let's cut this by parts. Part A would be the 10 km SE, Part B 11 km 30° NE and finally Part C would be the remaining 22 km
Part A:
in this case, is heading south east, so it's going in the x-axis positive but y-axis negative so:
Dxa = 10 cos15° = 9.659 km
Dya = 10 sin15° = 2.588 km (But as we are heading south is negative) = -2.588 km
Part B:
Heading NE, it's positive in the x-axis and y-axis so:
Dxb = 11 cos30° = 9.526 km
Dyb = 11 sin30° = 5.5 km
Part C:
Finally in this part is heading west, which means is heading in the x-axis negative, and it does not have a y component so:
Dxc = Dc = -22 km
Now that we have the displacement for each part and it's components, let's calculate the displacement in X and Y:
Dx = 9.659 + 9.526 - 22 = -2.815 km
Dy = -2.588 + 5.5 = 2.912 km
To calculate the magnitude of the displacement:
D = √Dx² + Dy²
D = √(-2.815)² + (2.912)²
D = 4.05 kmHope this helps
What's a cars net force if it's mass is 1500 kg and has a acceleration of 2 m/s (In Newton’s)
Answer: 3,000 N
Explanation:
F = mass x acceleration
F = (1500 kg)(2 m/s²)
F = 3000 N
Describe how the wavelength of a wave changes if the wave slows down but its frequency does not change.
Answer:
If the wave slows down with no change in frequency, the wavelength decreases.
If the wave slows down with no change in frequency, then the wavelength decreases.
What is a wave?A wave is defined as the disturbance that has the ability to transfer energy from one point to another in a medium.
The properties of a wave are given as;
Wavelength can be defined as the distance that is observed between adjacent points in an identical cycle of a waveform.
Frequency is the number of cycles of a wave that can occur per minute time.
Time period can be defined as the time it takes for a complete cycle of wave to occur.
Wave speed can be defined as the distance a wave travels in a given amount of time.
Amplitude can be defined as the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough.
When there is a change in the speed of the wave then the length of the wave would decrease.
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An individual drove 10 miles to his friends house. Then 15 miles to work.
Then 8 miles home. What was the distance traveled? *
0 miles
33 miles
25 miles
8 miles
Answer:
33 miles
Explanation:
10 + 15 + 8 = 33
A small angle is measured as 2 arc seconds. How many degrees or what portion of a degree does this represent?
Answer:
5.56 x 10⁻⁴ degree
Explanation:
1 degree = 60 arc minutes
1 minute = 60 arc second
1 degree = 60 x 60 = 3600 arc second .
3600 arc second = 1 degree
1 arc second = 1 / 3600 degree = 2.78 x 10⁻⁴ degree
2 arc second = 5.56 x 10⁻⁴ degree .
Boyle law lab report
Answer:
what about it?
Explanation:
Answer:
its my lab report i did it in 5 minutes and it might be wrong sorry lol
Explanation:
heheheh stinky badussey
Your friend tells you that if you double the distance of a spacecraft from the planet, the gravitational force is one half as strong. Do you think this is correct?
Answer:
No. When the distance is doubled, the gravitational force is 1/4 times as strong, therefore, the correct answer is she is not correct
Explanation:
The gravitational force is given as follows;
[tex]F} =G \times \dfrac{m_{1} \times m_{2}}{r^{2}}[/tex]
Where;
m₁, and m₂ are the masses sharing the gravitational field
G = The universal gravitational constant
r = The distance between the centers of the two masses
Therefore, when the new distance, R = 2 × r, we get;
[tex]F} =G \times \dfrac{m_{1} \times m_{2}}{R^{2}} = G \times \dfrac{m_{1} \times m_{2}}{(2 \times r)^{2}} = G \times \dfrac{m_{1} \times m_{2}}{4 \times r^{2}} = \dfrac{1}{4} \times G \times \dfrac{m_{1} \times m_{2}}{r^{2}}[/tex]
Therefore, when the distance is doubled, the gravitational force is one fourth as strong, therefore, she is not correct.
Hi, I'm trying to figure out #17 but I am having trouble on how to solve it. Any help would be greatly appreciated! Thank you.
Answer:
The mechanical advantage of the wheelbarrow is the product of the mechanical advantage of the lever, and the mechanical advantage of the wheel and axle. Therefore, the wheelbarrow has a mechanical advantage of 4.
hope this helps :D
Which are parts of a neuron?
Golgi complex
axon
mitochondria
dendrites
myelin sheath
membrane
When the biker is at the top of the ramp, he has a speed of 10 m/s at
the height of 25 m. The bike and person have a total mass of 100 kg.
He speeds into the spring at the end of the ramp, which slows him to
a stop. The total initial energy is
J.
Answer:
25000
Explanation:
100 x 25 x 10 = 25000
The total initial energy of the biker and the bike is 25000 J.
What is energy?Energy is the ability to do tasks. Joule is the SI unit for energy (J).
Potential energy, kinetic energy, thermal energy, chemical energy, electrical energy, and light energy are some of the several types.
Given parameters:
The bike and person have a total mass of 100 kg.
Speed of them = 10 m/s.
Height of them = 25 m.
Hence, initial kinetic energy = 1/2mv² = 1/2×100×10 joule = 500 joule.
initial potential energy = mgh = 100 ×9.8×25 joule = 24500 joule.
Hence, total initial energy = 24500 joule + 500 joule = 25000 joule.
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During 30.0 s, a train was moving with constant speed of 72 km/h. How far away it could relocate within this time?
Answer:
the distance is 0.6 km
Explanation:
The computation of the distance is shown below:
As we know that
Distance = Speed × time
where
Speed = 72 km/h
And, the time is 30 seconds
So, the distance is
= 72 × 30
= 0.6 km
Hence, the distance is 0.6 km
how to burn your module?
sabog na sabog nako eh
Answer:
get some
get some ⛽⛽⛽⛽⛽
pour the ⛽ on the module,
get that on itttttt and booooooommmm
Explanation:
How could I track my running speed without a car or special equipment?
What is an ion and how does an atom become both positive or negative ion?
Answer:
An ion is an atom or group of atoms with a positive or negative charge. Ions form when atoms lose or gain electrons to obtain a full outer shell: metal atoms lose electrons to form positively charged ions non-metal atoms gain electrons to form negatively charged ions.
Explanation:
four forces act at a point in the image above. calculate the resultant.
Answer:
50° and 60°
Explanation:
hope this help
I need answer ASAP, Will mark brainliest
Q. A car travels along a circular racing track at a constant speed of 100km/hr. Does it have uniform motion?
Answer:
Yes. If a car travels in a circular path with constant speed, its motion is called uniform circular motion
Explanation:
please
Brain-list it or support me at my U-Tube channel " ZK SOFT&GAMING " I will be thankful
Answer:
:)
Explanation:
Generators need a source of energy to produce electricity. Which form of energy to is a non renewable source of energy
Answer:
Nuclear energy is usually considered another non-renewable energy source.
A train left the station at 9:00am. The next stop was 629 km south. It
arrived at 2:00pm the same day. What was its speed?
Explanation:
We need to calculate the time it had travelled first:
9:00 to 12:00 = 3 hours.
12:00 to 2:00 = 2 hours
Total travel time = 5 hours.
The formula for speed is distance ÷ time (Hence, the unit for speed is m/s, kph, mph, etc.)
= 629km ÷ 5 hours
= 125.8 km/hour ~ 125.8kph
A dog pulls on a rope attached to a box and performs 250 J of work while dragging it across the floor a distance of 10 m. What amount of force is the dog pulling with?
Answer:
F = 25 N
Explanation:
The work done by any force is given as the product of the force and displacement produced by the application of that force. Therefore, the work done by the dog when it pulls the rope attached to the box can be given by the following formula:
[tex]W = Fd\\[/tex]
where,
W = Work done by the dog while pulling the rope = 250 J
F = Force of pull applied by the dog = ?
d = displacement of the box across the floor = 10 m
Therefore,
[tex]250\ J = F(10\ m)\\\\F = \frac{250\ J}{10\ m}[/tex]
F = 25 N
When the electric potential in a generator shifts positive, then negative and back positive, _____ is created.
Answer:
★ When the electric potential in a generator shifts positive, then negative and back positive, alternating current is created.
Explanation:
Hope you have a great day :)
2- A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h.
What is the average speed of the car?
A. 50 km/h
B. 45 km/h
C. 35 km/h
D. 30 km/h
Please I need the answer of this
The average speed of the car is 35 km/hr.
To calculate the average speed, the given values of speed are:
x = 20 km / hr
y = 50 km / hr
What is average speed and how it was calculated?If two objects are in motion, the distance by those two objects at any particular interval of time is said to be average speed.
The unit of average speed is m/s or km/hr.
For this particular question, the formula to find the average speed from the given speed is,
Average speed = ( x + y ) / 2
= ( 20 + 50 ) / 2
= 70 /2
= 35 km / hr.
Thus, Average speed can be calculated as 35 km/hr.
So, the Option C is the correct answer.
Learn more about Average speed,
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Which of the following can break solid rock
I would think the answer would be c
What is the quantity that has the units of m/s^2?
Velocity
Acceleration
Force
Momentum
Answer:
What is the quantity that has the units of m/s²?
VelocityAcceleration✓ForceMomentumAcceleration is the quantity that has the units of m/s².
Explanation:
Acceleration is the rate of change of velocity.
Acceleration=(Final velocity-Initial velocity)/Time.
30 points please answer asap!
4. What is the potential energy of the bowling ball as it sits on top of the building? Answer: Gravitational potential energy
Answer:
False, if its not moving there is no potential energy.
Answer:
The ball is at its max Potential energy because if it falls and hits the ground it will be at its max kinetic energy so since sitting high up it is equal to max potential energy. PE=784 J Trust ME that guy is wrong.
Explanation:
how will you relate yourself to stellar evolution?
Help please
At least 70 words
Asap
Answer:
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses.[1] All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-seque
for the same force why does a long cannon impart more speed to a cannonball than a short cannon
Answer:
The force is applied for a longer time in the long cannon.
A penguin drops a fish off a cliff and times how long it takes for the fish to land at the bottom of the cliff. Neglecting air resistance, how high is the cliff if it
takes 9.2 seconds for the fish to land at the bottom of the clift? Give the answer in feet.
Answer:
1360.3ft
Explanation:
Given parameters:
Time taken for the fish to land = 9.2s
Unknown:
Height of the cliff = ?
Solution:
To solve this problem, we use one of the kinematics equation:
S = Ut + [tex]\frac{1}{2}[/tex] g t²
S is the height
U is the initial velocity = 0m/s
g is the acceleration due to gravity = 9.8m/s²
t is the time taken
So;
S = (0 x 9.2) + ([tex]\frac{1}{2}[/tex] x 9.8 x 9.2²) = 414.7m
1m = 3.28ft
414.7m = 414.7 x 3.28 = 1360.3ft
A ship sails north for 2 hours, traveling a total of 15 miles. Then the ship turns south and travels 6 miles in an hour.
If north is taken as the positive direction, what is the velocity of the ship?
7 miles per hour ,
3 miles per hour ,
–3 miles per hour ,
–7 miles per hour
Answer:
3 miles per hour
Explanation:
Displacement is the overall change in distance or position of an object. It is the shortest distance from the starting point to the ending point. Displacement is a vector quantity.
Velocity is the time rate of change in displacement, it is the ratio of the total displacement to the total time taken. It is given by the formula:
Velocity = displacement / time
The ship sails north for 2 hours, traveling a total of 15 miles. Then the ship turns south and travels 6 miles in an hour.
The total displacement = shortest distance from initial to final point = 15 miles - 6 miles = 9 miles
Total time = (2 hours) + (1 hour) = 3 hours
Velocity = displacement / time = 9 miles / 3 hours = 3 miles per hour
Answer: 3mph
Explanation:
Help ?
Why is water power a renewable resource?
a
Water will always flow downhill due to gravity.
Water changes direction of flow from uphill to
b downhill, but dams and turbines are designed to
generate power from both directions.
Energy can be collected from stationary water, so
as long as there is water we can get energy.
d Water power isn't a renewable resource.
