Answer:
7.5 minutes (you mean hours)
t = 7.5 min (if it was actually not hours than put minutes just letting u know.)
Explanation:
The first thing you have to do is know the equation; it is t = d/s, which is time = distance divided by speed. Know fill in the equation, now it will be t = 750 km/100 km/ hr ( in this min). If you divide it, then the answer will be t = 7.5 min (which it has to be hours instead of min because hours makes more sense than minutes.)
The car will take 7.5 hours to cover a distance of 750km.
What are Speed and velocity?Speed is defined as the rate over time at which an object is moving along a path, while velocity is defined as the rate and direction of motion of an object. Speed is a scalar quantity as it has only magnitude, no direction but Velocity is a vector quantity as it has both magnitude as well as direction.
Speed can be expressed as:
Speed= Distance travelled/ Time taken
Velocity can be expressed as:
Velocity= Displacement travelled/ Time taken
Both the quantities are expressed as meter per second (m/s).
If the two values are given , we can calculate the another value like in the above given information, speed of the car = 100km/hr and distance travelled by the car= 750 km.
So, Time taken= 750/100 = 7.5 hours
Thus, the car will take 7.5 hours to cover a distance of 750km.
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which sI units are combined to describe force?
Answer:
Symbol N
Explanation:
The SI unit of force is the newton, symbol N
The units of mass, length, and time are.
The combination is the unit of force, called the "Newton".
1 Newton is the force that accelerates 1 kilogram of mass at the rate of 1 meter per second every second.
Which is a limitation of using cellulose?
its lack of mass production
its lack of biodegradability
3
its harm to landfills
O its high cost to recycle
Answer:
Its lack of mass production
Explanation:
Your Welcome;)
The limitation of using cellulose is its lack of mass production.
Cellulose is a polymer of glucose. It is obtained from glucose by condensation polymerization to yield a long chain.
Cellulose materials have a high potential of being quite useful as important materials for diverse applications.
However, the problem with cellulose materials is that they can not really be mass produced. This limitation has long encumbered the possibility of using cellulose materials for various applications in material science.
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3. The value of frictional force on block in the given
diagram is (Take g = 10 m/s2)
5N
m = 3 kg
8.
u = 0.3
(1) 4N
(2) 5 N
(3) 6 N.
(4) 9 N
How long should a spring be stretched for it to store 45 J of energy? The force constant of the spring is
540N/m?
Answer:
x = 0.4 m
Explanation:
When a spring is stretched from its equilibrium position. Some energy is stored in the spring. This energy is called the elastic potential energy of the spring. The formula used to calculate the magnitude of this stored energy is given as follows:
P.E = (1/2)kx²
where,
P.E = Elastic Potential Energy Stored in the spring = 45 J
k = Spring Constant = 540 N/m
x = amount of stretching = ?
Therefore,
45 J = (1/2)(540 N/m)x²
x² = (45 J)(2)/(540 N/m)
x = √(0.167 m²)
x = 0.4 m
When the mass of an object decreases, the force of gravity - Remains Unchanged - Decreases - increases - Becomes irregular
Answer:
Decreases
Explanation More mass=More gravitational pull
Less mass=Less gravitational pull
Hope this helps
Answer:
decreses
Explanation:
How to keep your community clean
Answer:
Work with the local civic groups to identify and eliminate eyesores, and beautify the local environment
Pick up a piece of litter every day
Keep a litter bag in your car or your recreational vehicle so you dispose of litter properly
Create a trash fishing contest in your waterway to increase awareness about illegal dumping and littering
Write a letter to the editor of your local newspaper asking others to respect public lands and keep them clean
Help your local schools conduct recycling drives and clean-up projects
Create a beautiful green space by planting trees and shrubs in an area in need of improvement.
Ask local businesses to adopt-a-spot and take care of it
Paint and fix up playground equipment
Organize a paint-out with family and friends and create a community paintbrush mural over a wall of illegal graffiti
Recycle your old tires
Report graffiti to your local authorities
Donate your old computer equipment or dispose of it properly
Conduct a recycling drive in your neighborhood or your business
Volunteer to help your employer conduct paper recycling drives at work
Donate gently used clothes to needy organizations and shelters and identify other items that you can reuse
Compost yard and food waste and seek advice if you don’t know how
Find out how pollution in storm drain runoff can impact our aquifers and ecosystems and be passionate about doing your part to reduce litter and solid waste
Ask your local government officials to establish regular community improvement activities and to support and promote volunteer efforts
Help your library establish an environmental corner that offers books and other educational materials about taking care of the Earth
Which ball has the greater acceleration at the instant of release?
Ball thrown upward or downward
They're equal.
Ignoring air resistance, any object you're not holding onto has the same, constant acceleration ... 9.8 m/s^2 down ... from the moment it leaves your hand until the moment it hits the ground.
It doesn't matter how heavy the object is, and it doesn't matter whether you throw it up, down, or sideways, or just let go and let it drop.
After you let go of a bowling ball, is there a force pushing it so that it keeps moving
forward? Explain.
Explanation:
No, the ball keeps moving forward due its momentum.
A net force causes an object to accelerate, which means it speeds up, slows down, or changes direction. A bowling ball does not speed up after you let go, so there is no forward force.
A drunk college student decides to try to do a perfect swan dive from his apartment window into the pool below. The edge of the pool is 5 meters from the base of the building and his window is on the 3rd floor, which is 8 meters from the ground. If he jumps out the window horizontally at a speed of 4 m/s, does he make it into the water or..
Answer:
He barely makes it but hit his leg on the pool edge.
Explanation:
Using kinematic formula: Δx=[tex]v_{0}t+(1/2)at^2[/tex]
We can plug in delta x, v zero, and acceleration.
delta x = 8 meters, v0 = 0. a = 9.8
8=(1/2)9.8*t^2
Around 1.278 seconds of airtime.
4 * 1.278 = 5.112 meters horizontally assuming no air resistance
That was close!
Evidence of a chemical change includes
A) change in size.
B) change in color.
C) change in shape.
Eliminate
D) change in weight.
Evidence of a chemical change includes
change in color
An object moves along the x-axis. The graph shows its position x as a function of time t. Find the average velocity of the object from points B to C. −8.3 m/s −4.2 m/s 0 m/s −0.12 m/s
Answer:
-8.3m/s
Explanation:
its correct
Answer: its 0.
Explanation: Gradpoint
A kettle of water is heated on a stove. What will happen to the molecules of the water in the kettle as the kettle continues to be heated by the flame?
Answer:
The molecules will take the heat energy and convert it to mechanical energy and they get "excited" and eventually their bonds will break and they will turn into water vapor.
A plane takes off at an angle of 30 degrees at a speed of 150 km/h. Determine the horizontal
and vertical components of this velocity vector.
Answer:
Horizontal Component = 129.9 km/h
Vertical Component = 75 km/h
Explanation:
When a vector is resolved on the x-axis and the y-axis, the components so formed are called its rectangular components. The component along y-axis is called the vertical component and the component along x-axis is called horizontal component. These components can be given by following formulae:
Horizontal Component = v Cos θ
Vertical Component = v Sin θ
where,
v = velocity = 150 km/h
θ = angle = 30°
Therefore,
Horizontal Component = (150 km/h)(Cos 30°)
Horizontal Component = 129.9 km/h
Vertical Component = (150 km/h)(Sin 30°)
Vertical Component = 75 km/h
if a object falls from 5 meters how long did it take for it to reach the ground explain(gravity= -10)
Explanation:
[tex]time \: period = \sqrt{ \frac{2h}{g} } = \sqrt{ \frac{10}{10} } = 1sec[/tex]
differenciate between emf and potential difference
Answer: 1.Emf is the total voltage in the battery while the potential difference is the work done in moving a charge against the electric field between two specific points in the circuit. 2.Emf is always greater than the potential difference.
Explanation:
To me (electrical engineer since 1973), there is no difference. They are two different names for the same thing.
Sarah throws a ball directly upward at the edge of a cliff with a starting velocity of 3.0 m/s
It lands on the ground with a final speed of 6.0 m/s
How long is the ball in the air?
Round the answer to two significant digits
Answer:
The correct answer is t = 0.92s
Explanation:
Initial velocity v0 = 3.0 m/s
Displacement Δy = ?
Acceleration a = -9.8m/s2
Final velocity v = -6.0m/s
Time t=? Target unknown
We can use the kinematic formula missing Δy to solve for the target unknown t:
V=v0+at
We can rearrange the equation to solve to t:
V-v0=at
t= v-v0/a
Substituting the known value into the kinematic formula gives:
t= (-6.0m/s)-(3.0m/s)
————————————
-9.8m/s2
= -9m/s
—————-
-9.8m/s2
=0.92s
Sarah throws a ball directly upward at the edge of a cliff with a starting velocity of 3.0 m/s. It lands on the ground with a final speed of 6.0 m/s.
How long is the ball in the air?
Answer: 0.92
1. How many energy levels do the electrons in an atom of iron occupy?
Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus. Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the lowest available energy level first.on:
Answer:
26. Brainliest?
Explanation:
Iron atoms have 26 electrons and the shell structure is 2.8.
a car is driving at 57 mi/hr, how long will it take for the car to go 80 mile
Answer:
1 hour 6 minutes and about 6 seconds
what's the meaning of phisikos
A word-forming element meaning "physical, physically; natural," from Latinized form of Greek physikos "natural, physical, pertaining to nature."
A 0,34-kg volleyball is flying west at 1,98 m/s when it strikes a stationary 0,60-kg basketball dead centre. The volleyball rebounds east at 0,79 m/s. What will be the velocity of the basketball immediately after impact? Choose the east direction as positive.
Explanation:
use the law of conservation of momentum
M1U1+M2U2=M1V1+M2V2
m-mass
u-initial velocity
v-final velocity
1-volleyball
2-basket ball dead center
so using the above formula
0.34×1.98+0.64×0=0.34×0.79+0.64×V2
to get
0.6732+0 = 0.2686+0.64V2
0.4046=0.64V2
divide both sides by 0.64 to get V2 which is the final velocity of basketball
0.6322m/s=V2
The final velocity of the basketball after the impact is 1.643 m/s west.
The given parameters;
mass of the volleyball, m = 0.34 kginitial velocity of the volleyball, u₁ = 1.98 m/smass of the stationary basketball, m₂ = 0.6 kgfinal velocity of the volleyball, v₁ = 0.79 m/sThe final velocity of the basketball after the impact is calculated by applying the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
0.34(-1.98) + 0.6(0) = 0.79(0.34) + 0.6(v₂)
-0.673 = 0.316 + 0.6v₂
-0.989 = 0.6v₂
[tex]v_2 = \frac{- 0.989}{0.6} \\\\v_2 = -1.643 \ m/s\\\\v_2 = 1.643 \ m/s \ west[/tex]
Thus, the final velocity of the basketball after the impact is 1.643 m/s west.
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A 2 kg ball is dropped from the roof of a building 27.5 m tall. How long
does it take to hit the ground?
Answer:
wow I need time to solve dis
A truck covered 2/7 of a journey at an average speed of 40
mph. Then, it covered the remaining 200 miles at another
average speed. If the average for the whole journey was 35
mph, what was the amount of time for the whole journey?
h
Answer:8h
Explanation:
Answer: 8 h
Explanation:
I got it right
hey can anyone help me out in dis pls
Answer:
All of the above
Explanation:
Solids have a fixed shape and volume.
Even though the molecules in a solid are vibrating, they can't travel from one part of the solid to the other.
I hope this helps! :)
A student clicks the mouse at time intervals of 1.60, 2.10, 2.40, 1.90 what is the standard deviation of this dataset.
A. 0.22
B. 0.25
C. 0.29
D. 0.58
Use the picture to answer the question. Name at least three physical properties of the bowling ball.
Answer:
Density, Color, and Luster.
Explanation:
Density, describes how compact the matter is in a substance. A bowling ball is more dense than a beach ball. Color - Describes how light reflects off a substance. Luster - Describes how shiny a substance is.
Answer:
The physical properties is hardness shape and color, I choose hardness because I have grabbed bowling balls before and they are very hard well there could be different types of bowling balls made of different things but I have never seen one or toughed a bowling ball that is not hard. Another physical property I chose for the bowling ball was shape, The reason I chose shape was because the bowling ball is circle, the actual name for a 3-D circle is sphere. The last physical property for a bowling ball is color because mostly all bowling balls have color for example the one in the picture it is red with a little bit of pink, there is many different bowling balls that have different color different hardness but NOT different shape. That is the physical properties of a bowling ball.
Explanation:
:)
Erica forgot to put gas in her car (again) for two weeks. The graph below shows the last few seconds of her car being stalled along Elkins Drive st 7:23 am Friday. During the time shown, what was the acceleration of her car?
a 54 m
b 108 m/s
c 3 m/s^2
D -3 m/s^2
Answer:
Option (D) : - 3 m/s^2
Explanation:
Acceleration = Slope of v-t graph
= 18/6
= - 3 m/s^2 (-ive since the car is decelerating )
Help me I need this now
Answer:
If the height of the ramp is changed at a different height then the speed of the car will change.
The time period of a wave T is the the time taken to produce one complete wave. If the frequency of a wave is 2 Hz, what is it’s time period?
Answer:
0.5s
Explanation:
if the frequency is 2Hz that means it makes 2 complet cycles in one second. The time period for one cycle would be 0.5s
Martin Luther King, Jr., was awarded the Noble Peace Prize * Yes No
Answer
Explanation:
duh he was fighting for peace half of his life
In the lab, you looked at speed-time graphs to determine the acceleration of the cart for each of the three fan
speeds.
What was the acceleration of the cart with Low fan speed?
cm/s2
What was the acceleration of the cart with Medium fan speed? cm/s2
What was the acceleration of the cart with High fan speed?
cm/s2
Answer:
(I). The acceleration of the cart with low fan speed is 18 cm/s²
(II). The acceleration of the cart with medium fan speed is 23.3 cm/s²
(III). The acceleration of the cart with high fan speed is 32 cm/s²
Explanation:
Given that,
You looked at speed-time graphs to determine the acceleration of the cart for each of the three fan speeds in the lab.
According to graph,
A , B and shows the high, medium and low fan speeds respectively.
We know that,
The speed-time graph shows the acceleration.
Acceleration is equal to the rate of change of velocity.
(I). We need to calculate the acceleration of the cart with low fan speed
Using formula of acceleration
[tex]a_{l}=\dfrac{v_{f}-v_{i}}{t_{f}-t_{i}}[/tex]
Put the value from graph
[tex]a_{l}=\dfrac{125-0}{7}[/tex]
[tex]a_{l}=18\ cm/s^2[/tex]
(II). We need to calculate the acceleration of the cart with medium fan speed
Using formula of acceleration
[tex]a_{m}=\dfrac{v_{f}-v_{i}}{t_{f}-t_{i}}[/tex]
Put the value from graph
[tex]a_{m}=\dfrac{140-0}{6}[/tex]
[tex]a_{m}=23.3\ cm/s^2[/tex]
(III). We need to calculate the acceleration of the cart with high fan speed
Using formula of acceleration
[tex]a_{h}=\dfrac{v_{f}-v_{i}}{t_{f}-t_{i}}[/tex]
Put the value from graph
[tex]a_{h}=\dfrac{160-0}{5}[/tex]
[tex]a_{h}=32\ cm/s^2[/tex]
Hence, (I). The acceleration of the cart with low fan speed is 18 cm/s²
(II). The acceleration of the cart with medium fan speed is 23.3 cm/s²
(III). The acceleration of the cart with high fan speed is 32 cm/s²
Answer:
18.0, 24.0, 32.0
Explanation:
just did it