Answer:
Explanation:
For velocity
Velocity = Gradient of displacement - Time graph
That is, velocity (speed) = distance (or displacement) / time
i need help with this one 2 if you guys don’t mind
A man is lifting a piano that weighs 800 N through a distance of 10 meters using a pulley system. The man pulls the rope a total distance of 100m. What force does the man need to apply to the rope?
Answer:
The force the man applied is 80 N
Explanation:
weight of the load, L = 800 N
distance traveled by the load, a = 10 m
distance traveled by the effort, b = 100 m
Output work = load x distance moved by the load
Output work = 800 x 10 = 8000 J
Input work = Effort x distance moved by effort
Input work = Effort x 100 m
Assuming an ideal machine; no friction effect, the input work will be equal to output work.
Effort x 100 m = 8000 J
Effort = 8000 / 100
Effort = 80 N
Therefore, the force the man applied is 80 N
Questions
3 pts
Convert 6.36 x 104 from scientific notation to standard decimal with the correct number of significant digits.
Answer:
Explanation:
standard decimal form of 6.36*10^4 is
6,3600.0
There are other equally good substitutes for exercise. True False
Answer:
B is the answer to this question
Answer:
True
Explanation:
For Example
Walking is a form of exercising without realising it
when you think you are creating blood flow which is oxygen which generates energy with that being said could be considered exercising no matter what you do in a result of energy in the body you are exercising.
If a car travels 23.8 meters in 4.2 seconds, what is its speed?
Put your units in the form of a correct abbreviation (example, write s for seconds, m
for meters, or m/s for meters per second).
Which combination of variables will make an experiment the most reliable?
A. One dependent variable and one experimental variable
B. One controlled variable and many experimental variables
C. Two controlled variables
D. Two experimental variables
Answer:A
Explanation: it’s A
How does air pressure help to inflate a football?
Answer:
When air is flushed into the ball, the elastic lining inside is expanded. This happens because when too much air enters, there is a lacking of space inside. Therefore the air with pressure pushes the walls of the ball and results in inflation.(same like after you have excess food your stomach inflates)
A ball is shot into the air with initial speed of 40 m/s. How high will the ball go before falling back down?
A. 20m
B. 40m
C. 60m
D. 80m
Answer:
B. 40m
Explanation:
A car starts from rest and acquires a velocity of 50m/s in 3secs. Calculate i) acceleration ii) distance covered.
Answer: 75.02 m
Explanation:
u = 0 ( starts from rest )
v = 50 m/s
t = 3 s
( i ) a = v - u / t
= 50 - 0 /3
= 16.67
( ii ) s = ut + 1/2 at²
= 0 × 3 + 1/2 × 16.67 × 3 × 3
= 75.02 m
Hope this helps...
The microwave oven was invented in 1945 when some experiments with radar equipment failed and melted some nearby chocolate instead. The scientists realized there were other applications for this energy source. What is an example of.
Answer: Creative Thinking.
Explanation: Creative thinking this is a special ability possessed by individuals to see things differently or I’m a different dimension, and find new ways of solving problems. The fact it’s Creative thinking skills doesnt mean it’s for only 'creative types' like musicians. Everyone can also be a beneficiary of creative thinking from time to time. Just like in the case of the scientist above who saw an invention from his failed experiment.
Answer:
good thinking
Explanation:
gave the person above me brainy
Plz help me ASAP How does sound travel from its source to your ear??? 1. By changes in air pressure 2. By vibrations in wires or strings 3. By electromagnetic wave 4. By infrared waves
Answer:
2. By vibrations in wires or strings.
A water strider bug is supported on the surface of a pond by surface tension acting along the interface between the water and the bug’s legs. Assume the bug weighs 10−4 N and the surface tension force acts vertically upward. Determine the minimum length of the interface needed to support the bug
Answer:
minimum interface length = 1.36 mm
Explanation:
given data
weight of the bug = [tex]10^{-4}[/tex] N
solution
we will apply here Surface Tension formula that is
Surface Tension ,σ = Force ÷ length ........................1
and we consider here surface tension for water is 7.34 × [tex]10^{-2}[/tex] N/m
so that here minimum interface length needed to support the bug is
minimum interface length = Force ÷ σ
minimum interface length = [tex]10^{-4}[/tex] ÷ 7.34 × [tex]10^{-2}[/tex]
minimum interface length = 1.36 mm
Bella makes the 6.1m distance to her food bowl in 8.8 seconds what is her average velocity
What is the volume of a box that is 3 m long, 0.5 m high, and 2 m wide?
why do we accelerate forward when we run?
It depends on what direction you are running in, if it's forward, you'll have to keep to accelerating forward to keep running.
If you stop accelerating forward, you wouldn't be able to move forward.
If you were to measure your pulse rate while in a spaceship moving away from the Sun at a speed close to the speed of light, you would find that it was
Answer:
Your pulse rate will be the same as it was while you were on Earth.
Explanation:
Since you are on the ship, and you have the same speed with the ship, then, you'll observe your heart rate to be the same as your heart rate while you were on Earth. This is because there is no relative speed between you and the ship, since you're both on the same frame of reference.
It appears as though your vehicle is about to be hit on the right side (a broadside collision). What should you do to reduce damages from the collision?
Answer:
Turn the vehicle to the left, in order to reduce the momentum on the car during sackcloth
Explanation:
In the case of a collision on the right side, two things can be done to reduce the damage caused.
* Turn the vehicle to the left, in order to reduce the momentum on the car during sackcloth
* Decrease the speed, to have a less change in the amount of movement.
6. If a vehicle needs 5s to complete 15m. Find the mean speed of it?
3) 3ms
4) 20ms
1) 75ms
2) 10ms
Answer:
3m/s
Explanation:
Time=5s
Distance =15m
Speed=distance/time
Putting the values
Speed=15m/5s
Speed=3m/s is the answer
Hope it will help you. :)
How many seconds will it take for a satellite to travel 550 km at a rate of 130 m/s?
Answer:
4230.77s
Explanation:
We know: t=D/S, 550 km =550,000 m, so you can get the time by dividing 130 from 550000, you can get: 550000/130 approximately equals to 4230.77s. :) If I am correct, Mark the Brainlist, plz :D
It would take 4230.7692 seconds for a satellite to travel 550 km at a rate of 130 m/s
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.
The mathematical expression for velocity is given by
velocity= total displacement/Total time
As satellite has to travel 550 km
1Km =1000 m
550 km = 550000 m
Time is taken by satellite to travel 550000 m by velocity rate of 130 m/s
Time = displacement/velocity
=550000/130 seconds
=4230.7692 seconds
Thus, the satellite will take 4230.7692 seconds
Learn more about Velocity from here
brainly.com/question/18084516
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As a increases and c stays constant, b does what
Answer:
b decreases as a increases and c stays constant
It all depends on the definitions of a, b, and c, and the relationship among them. Your question doesn't give us any of this information.
30. A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD?
Answer:84 generations
Explanation:
A generation is about one-third of a lifetime. Approximately how many generations have passed since the year 0 AD? Approximately 84 generation.
A tennis ball moves 22 meters southward then 12 meters northward then 16 meters southward and finally 34 northward
Answer:
The tennis ball ended 8 m north from the starting point.
Explanation:
If we label North as positive and south as negative for axis of reference, then the tennis ball performed the following displacements (in units of meters):
- 22 m + 12 m - 16 m + 34 m = 8 m
Which means that it ended 8 m north from the starting point.
A student leaves a sidewalk corner walks 3.0 blocks north then walks 3.0 blocks west.what is the students displacement from the starting position
Answer:
The students displacement is 3·√3 blocks, 45° North of West
Explanation:
From the question, we have;
The distance North in which the student walks = 3.0 blocks
The next walking distance West by the student = 3.0 blocks
The displacement of the student = The shortest distance between the student start and final point
By representing the motion of the student in vector format, we have;
[tex]\mathbf{d} = 3\cdot \hat{i} + 3\cdot \hat{{j}}[/tex]
Therefore the magnitude of d is given as follows;
[tex]\left | d\right | = \sqrt{3^2 + 3^2} = 3\cdot \sqrt{3} \ blocks[/tex]
The direction of the student = tan⁻¹(3/3) = 45° West of North
The students displacement = 3·√3 blocks, 45° North of West.
What is the mass of a car that has a kinetic energy if 4,320,000 J moving at 23 m/s?
Answer:
kinetic energy=1/2mv^2.
which is 4320000=1/2×m×23^2.
which is 4320000=1/2×m×529.
4320000=264.5m.
m=4320000/264.5.
m=16332.70~16333g
The mass of a car that has a kinetic energy of 4,320,000 J moving at 23 m/s would be 16332.70 Kg
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
Total mechanical energy is s the sum of all the kinetic as well as potential energy stored in the system.
ME = KE + PE
As given in the problem we have to calculate the mass of a car that has a kinetic energy of 4,320,000 J moving at 23 m/s
K.E = 4,320,000 J
v = 23 m/s
The total kinetic energy
KE = 1/2mv²
By substituting the respective values in the formula of kinetic energy
4,320,000 J =1/2m23²
m = 4,320,000×2/23²
m = 16332.70 Kg
Thus, The mass of a car that has a kinetic energy of 4,320,000 J moving at 23 m/s would be 16332.70 Kg
Learn more about mechanical energy from here
brainly.com/question/12319302
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The major changes in the state of the universe that occurred immediately after the Big Bang were in ______ and ______.
A car is moving with a speed of 15ms-¹.How long does it take to cover a distance of 1.2km?
1.2 km × 1000 = 1200m
1200m : 15 = 80s
so it will take 80 seconds or 1 minute 20seconds.
If our Solar System was compressed by a factor of 10 billion such that the Sun is about the size of a grapefruit here in downtown Atlanta, then the nearest star (also about the size of a grapefruit) would be approximately at the distance of
Answer: 3,602.4 km
Explanation:
Ok, the distance between the sun and the nearest star is 4.22 light-years.
1 light-year = 9.461x10^12 km
4.22 light-years. = 4.4*(9.461x10^12 km) = 41.6284x10^12km.
Now, the radius of the Sun is:
r1 = 693,340 km
The radius of the grapefruit is around:
r2 = 6cm
Then in this new scale, 6 centimeters are equivalent to 693,340 km.
Now, how many times there are 693,340 km in 41.6284x10^12km?
We can take the quotient:
N = (41.6284x10^12km/ 693,340 km) = 60,040,384.
Then, the distance between the sun-grapefuit and the nearest star will be 60,040,384 times 6 centimeters:
Distance = 60,040,384*6cm = 360,242,304 cm ≈ 3,602.4 km
716 decimeters + 840 centimeters = ____________ meters?
Answer:
80metre
Explanation:
1m=10decimetre,100 cm
80 meters
Explanation:1 m = 10 dm
716 dm = 716 : 0,1 m = 71, 6 m
1 m = 100 cm
840 cm = 840 : 0,01 m = 8, 4 m
716 dm + 840 cm =
= 71,6 m + 8,4 m
= 80 meters
Newer aircraft jet catapult systems use magnets instead of steam. The launch still takes 1.19 seconds, but the acceleration is a about 47.41 m/s2. Determine the length of the runway on the carrier, assume the aircraft starts from REST
Answer:
33.6 m
Explanation:
Given:
v₀ = 0 m/s
a = 47.41 m/s²
t = 1.19 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (0 m/s) (1.19 s) + ½ (47.41 m/s²) (1.19 s)²
Δx = 33.6 m
What is a tomato
Fruit
Root
Stem
None of these