Answer:11
Explanation: because is the number that repeted 2 times
distance travelled by a train is 495 km in 4 hours 30 minutes, what is its speed in m/s?
Answer:
9.09m/s
Explanation:
Speed = Distance/Time
Distance = 495km
Time = 4 hr 30 min = 4 hr 1/2hr = 4.5 hr
Therefore, Speed = 495/4.5 = 110km/h
Now to convert km/h to m/s
110 x 1000/ 110 x 110
110 cancels out each other, we are now left with
1000/110 = 9.09m/s
Starting from rest, a truck accelerated at a rate of 2 m/s to the right for 25 seconds. How far will the truck travel during this time period
Answer:
S= ?
V=2m/sec
t=25s
S=V*t
S=2*25
S=50m
what is the speed of a car that travels a distance of 200m in 2.3 seconds ?
Answer:
460metre per second
Explanation:
Speed = Distance x Time.
Two grocery carts have the same initial total momentum. The two carts collide, and now cart B has a greater final velocity.
Which best describes the final total momentum of both the carts compared to the initial total momentum?
It is less if cart B has a smaller mass.
It is greater if cart B has a greater mass.
It is the same if no external forces are added.
It depends on the masses of cart A and cart B.
Answer: The anser is C
Explanation:
It is the same if no external forces are added.
Based on the principle of conservation of linear momentum, the final total momentum of both carts compared to the initial total momentum is the same if no external forces are added.
The given information;
two carts have equal initial momentum beforeafter collision, cart B has greater final velocityAccording to the principle of conservation of linear momentum, the total momentum before collision is equal to the total momentum after collision.
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
where;
m₁ and m₂ are the masses of the two cartsu₁ and u₂ are the initial velocities of the two cartsv₁ and v₂ are the final velocities of the two carts after collisionThus, based on this principle (conservation of linear momentum), the final total momentum of both carts compared to the initial total momentum is the same if no external forces are added.
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Which of the following elements are found in Group 1A (sometimes referred
to as Group 1)?
Check all that apply.
A. Potassium
B. Argon
C. Hydrogen
D. Krypton
Answer:
A. Potassium
C. Hydrogen
Explanation:
You accidentally throw your car keys horizontally at 8.0 m/s from a cliff. If yours keys land 28 m from the base of the cliff, how high was the cliff? Question 10 options: 17.15 m 60 m 45 m 28 m
Answer:
[tex]45m[/tex]
Explanation:
Let [tex]V_0[/tex] be the horizontal speed of the keys and D be the horizontal distance covered by the keys.
[tex]V_0= 8.0 \frac ms[/tex]
[tex]D= 28 m[/tex]
The initial velocity in the vertical direction is [tex]0[/tex].
Let [tex]g[/tex] be the acceleration due to gravity, which always acts vertically downwards, so, it will not change the horizontal direction of the speed, i.e. [tex]V_0[/tex] will remain constant throughout the projectile motion.
Let [tex]t[/tex] be the total time of flight in seconds. So,
[tex]D= V_0t[/tex]
[tex]\Rightarrow 28=8t[/tex]
[tex]\Rightarrow t=3 s \; \cdots (i)[/tex]
Let [tex]H[/tex] be the hight of the cliff.
Now, from the equation of motion
[tex]s=ut+\frac 1 2 at^2\;\cdots(ii)[/tex]
Where is the displacement is the direction of force, is the initial velocity in the direction of force, is the constant acceleration due to force and is the time of flight.
Here, , and (negative sign is for taking the sigh convention positive in the direction as shown in the figure.)
From equation (ii)
[tex]-H=0\times t + \frac 1 2 (-g)t^2[/tex]
[tex]\Rightarrow H= \frac 1 2 gt^2[/tex]
Take [tex]g= 10 \frac m{s^2}[/tex] and put the value of [tex]t[/tex] from equation (i), we have
[tex]H=\frac 1 2 \times 10\times 3^2[/tex]
[tex]\Rightarrow H= 45 m[/tex].
Hence, the height of the cliff was [tex]45 m[/tex].
7. The technology they had in the 70's was similar to a modern day _______________ that could fit in our pocket. (space science; The Farthest: Voyager in Space Viewing Guide)
Answer:
Key Fob.
Explanation:
On the 5th of September, 1977, the National Aeronautics and Space Administration (NASA) launched a spacecraft known as "Voyager 1" to study and explore the outer planets of the solar system.
Additionally, two voyager spacecraft were built for the above mentioned study and exploration exercise; Voyager 1 and Voyager 2. Voyager 2 was actually the first spacecraft while Voyager 1 was launched sixteen (16) days after and was faster.
According to Rich Terrile, the technology they had in the 70's was similar to a modern day Key Fob that could fit in our pocket because the processing power of the computer chip found in a Key Fob was comparable to the much larger voyager probe (Voyager 1 and Voyager 2) of the 70's, that was tagged an artificial brain.
This ultimately implies that, the computer chip found in a car Key Fob is more powerful and sophisticated than the Voyager probe, even though the Key Fob is smaller but having the same amount of memory.
give reason the si syetem of units is better than the mks system
is there a tutor available
CAN YOU THE 3 QUESTIONS ILL PUT U AS BRAINLEST!!!!
Answer: 1. 5 1/6 m/s 2. Traveling Left 3. 0.45
Explanation:
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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
Which best describes internet wikis as a source of scientific information
Answer:
They are written or edited by anyone
Explanation:
Write about natural indicators.
Why do we insulate houses?
A. To prevent heat transfer from inside to
the outside
B. To allow energy to flow from inside to
the outside
C. To keep them cool in the winter and
warm in the summer
in general, as the human population increases which of the following is true? OA The amoum of habitat destroyed by people decreases OB. The sound of clean water available for use increases. OC. The amount of waste produced by people decreases D. The amount of resources used by people increases
What aspect of motion can you conclude is common among freely falling objects ?
Answer:
Free-fall is defined as the movement where the only force acting on an object is the gravitational force.
By the second Newton's law, we have that:
F = m*a
Where F = Force, m = mass, a = acceleration.
We can write this as:
a = F/m
And the gravitational force can be written as:
F = (G*M/r^2)*m
Where G is the gravitational constant, M is the mass of the Earth in this case, and r is the distance between both objects (the center of the Earth and the free-falling object)
As the radius of the Earth is really big, the term inside the parentheses is almost constant in the region of interest, then we can write:
G*M/r^2 ≈ g
And the gravitational force is:
F = g*m
And by the second Newton's law we had:
a = F/m = (g*m)/m = g
a = g
Then the acceleration does not depend on the mass of the object.
Then the thing that is common among the free-falling objects is the vertical acceleration.
Robin jogs with an average speed of 5.5 m/s for 3.3s.
What was her distance travelled in meters?
Answer:
18.15m
Explanation:
Speed * Time = Distance
5.5 * 3.3 = 18.15m
The distance traveled by Robin is equal to 18.15 m with an average speed of 5.5 m/s for 3.3s.
What is the average speed?The average speed can be explained as the total distance covered by the object in a definite time. The average speed can be considered a scalar quantity as it exhibits magnitude and no direction.
The average speed of a physical system can be determined from the ratio of the total distance traveled by the system to the time taken to cover that distance.
The average speed equation of a physical system can be written as follows:
Average speed = Total distance/total time taken
Given, the average speed of the Roin, = 5.5 m/s
The time is taken by Robin for jogging = 3.3 s
The average speed of the Robin can be determined as:
Average spped = Distance/ time
5.5 = Distance/3.3
Distance traveled by Robin = 5.5 × 3.3 = 18.15 m
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A block has two forces on it. One force is 15 N going north and the other is 22 N going east. What is the overall force pushing on the block with magnitude and direction?
Answer:
The overall force pushing on the block is 26.63 N in the direction of N 34° E
Explanation:
Given;
force going north, F₁ = 15 N
force going east, F₂ = 22 N
The resultant of the two forces is the hypotenuse side of the right angled triangle formed by the two forces.
Let the magnitude of the resultant force = F
F² = F₁² + F₂²
F = √(F₁² + F₂²)
F = √(15² + 22²)
F = 26.63 N
The direction of the force is the angle between the resultant force and the horizontal force.
tan θ = 15 / 22
tan θ = 0.6818
θ = tan⁻¹ ( 0.6818)
θ = 34°
Therefore, the overall force pushing on the block is 26.63 N in the direction of N 34° E
Which of the following are states of matter?
A. Gas
B. Compound
€. Mixture
D. Solid
E. Liquid
Answer:
Solid , liquid and gas
Explanation:
However, mixture and compound are other things.
How does distance affect gravity???
Answer:no because distance is weaker than gravity
Explanation:the strenght of the gravita force between the two objects depend on two facto mass and distance the force of gravity the masses exert on each other increases the force of gravity decreases if the distance is doubled the force of gravity is one fourth as strong as before
2. On a par 4 golf course, you make the ball in:
1. Hole in one
2. Birdie
3. Par
4. Eagle
5. Double bogey
6. Triple bogey
7. Bogey
a. 7 shots from the tee
b. 5 shots from the teel
c. 1 shot from the tee
d. 4 shots from the tee
e. 3 shots from the tee
f. 2 shots from the tee
g. 6 shots from the tee
What do all of the elements in group 13 have in common?
On what factors does the quantity of heat of an object depend?
Explanation:
This quantity is known as the specific heat capacity (or simply, the specific heat), which is the heat capacity per unit mass of a material. Experiments show that the transferred heat depends on three factors: (1) The change in temperature, (2) the mass of the system, and (3) the substance and phase of the substance.
The nucleus of most atoms is composed of which of the following sub-atomic particles?
Answer:
protons (+ charge) & neutrons (neutral charge)
however protons has a positive charge so it determined what atom it is.
Answer:
tightly packed protons and neutrons
Explanation:
in your ans
A jogger runs the first 250 m of a race in 13.5 sec. What is the jogger's
velocity(m/s)?
Answer:
S=250 m
t=13.5 sec
V=?
Explanation:
V=S/t
V=250/13.5
V=18.51m/s
A positively charged atom has
Answer:
Lost electrons
Explanation:
For a atom to become positively charged it needs to have more protons than electrons
The gravitational acceleration on Earth is 9.8 m/s2. What is the weight of a car on Earth (to the nearest whole number) if it has a mass of 1360 kg? 14 N 139 N 1333 N 13,328 N
Weight = (mass) x (gravitational acceleration where the mass is)
Weight = (1360 kg) x (9.8 m/s²)
Weight = 13,328 kg-m/s²
That's 13,328 Newtons
Given:-
Mass (m) of the car = 1360 kgAcceleration due to gravity (g) = 9.8 m/s²To Find: Weight (W).
We know,
W = mg
where,
W = Weight,m = Mass &g = Acceleration due to gravity.Thus,
W = (1360 kg)(9.8 m/s²)
→ W = 13,328 N (D)
A speed racer travels 25.3 m/s in 9.6 s. How far did it travel?
Speed = 25.3 m/s
Time taken = 9.6 s
To be calculated:-Calculate the distance covered by a body.
Formula applied:-Speed = Distance/Time
Solution:-We know,
Speed = Distance/Time
[tex] \bf\implies \: 25.3 = \frac{Distance}{9.6} [/tex]
[tex] \bf \implies \: Distance = 25.3 \times 9.6[/tex]
[tex] \bf\implies \: Distance = 242.88 \: m \: (approx)[/tex]
A baseball player throws a baseball at 42 m/s. If the other player catching the baseball is 18 m from the player, how much time does it take the baseball to reach him?
Divide the distance by the speed:
(18 m) / (42 m/s) = 3/7 s ≈ 0.43 s
1) Describe how the atoms of a solid differ from the atoms of a liquid.
Answer:
liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
The atoms of solids and liquids are different from each other in many ways as discussed below.
We have a solid and a liquid.
We have to describe how the atoms of a solid differ from the atoms of a liquid.
What is Atom?An Atom smallest unit into which matter can be divided without the release of electrically charged particles.
According to the question, the following differences exists between the atoms of solids and liquids -
In solids the atoms are tightly packed while in liquid they are loosely packed.In solids the density of atoms within a specific volume is very high while in liquid it can be either high or low.In solids, atoms are not free to move and they can only oscillate about their mean position while in liquid the atoms are free to move.Hence, it can be seen that the atoms of solids and liquids are quite different from each other.
To learn more about the Structure of matter, visit the link below-
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What kind of things would Physics be able to answer? I. How does a hair dryer work? II. How does a lightning bolt form? III. How far will a cannon ball fly through the air? IV. What happens to a person after they die? I and III I, II, and III I only I, II, IV
Answer:
physics answers everything to understand biology you need to understand chemistry which is connected to physics which is connected to mechanics like fluid mechanics or quantum mechanics which is connected to math and all of that is science not particularly physics but physics can answer all of the questions you asked and more.
Explanation:
Answer:
sorry im only in fifth grade
Explanation: