Answer:
D. East That's my correct answerI really need help with this, I would be happy if someone could help me.
You fly round-trip from Los Angeles to New York. The flight takes 6 hours each way and covers a distance of 4800 km. What were your average speed and average velocity on this round-trip flight?
Answer:
Average speed = 800 km/h and average velocity = 0
Explanation:
You fly round-trip from Los Angeles to New York.
Distance covered, d = 4800 km in 6 hours
We need to find the average speed and average velocity on this round-trip flight. Round trip means to come back at the initial point.
Total distance = 4800 km + 4800 km = 9600 km
Time, t = 6 h + 6 h = 12 h
Average speed,
[tex]v=\dfrac{9600\ km}{12\ h}\\\\v=800\ km/h[/tex]
So, the average speed is 800 km/h
When it comes back to the initial point. Its displacement is equal to 0. It means its average velocity will be equal to 0.
In the graph above, what is the instantaneous speed of the object after the first five seconds?
A) 0 m/s
B) 5 m/s
C) 12.5 m/s
D) 25 m/s
Answer:
D) 25 m/s
Explanation:
In order to solve this problem we must use the following kinematics equation.
[tex]v_{f} =v_{i} +(a*t)\\[/tex]
where:
Vf = final speed [m/s]
Vi = initial speed = 0
a = acceleration = 5[m/s^2]
t = time = 5[s]
After 5 seconds the acceleration is equal to 5 [m/s^2]
Now replacing the values in the equation:
Vf = 0 + (5*5)
Vf = 25[m/s]
You lift your pet cat vertically by 2.0 m, and
then you lower it vertically by 2.0 m. During this
exercise, is the total work done by gravity positive,
negative, or zero? Explain your answer.
Answer:
zero cause the positivity and negativity would cancel out
Explanation:
Which pair does NOT have an electric force between them?.
Two neutral objects will not have any electric force of attraction or repulsion between them.
What is the condition for the electric force between two objects?As we know from the electrostatics that whenever there are two charges having a positive charge on one and a negative on the other will attract each other
similarly, if they are having like charges which are both of them having positive or both of them having a negative charge then there will be a force of repulsion between them.
But if both of them or even one of them is neutral then there will not be any electric force between them.
Thus neutral objects will not have any electric force of attraction or repulsion between them.
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he cai
9) Mount Everest is 8848 m above the sea level. Find the
acceleration due to gravity at this height. The value of
acceleration due to gravity at the earth's surface is 9.8 m/s2
and the radius of the earth is 6400km.
Given parameters:
Height of Everest = 8848m
Acceleration due to gravity on earth = 9.8m/s²
Radius of the earth = 6400km = 6400000m
Unknown:
Acceleration due to gravity at the peak of Everest =?
Solution:
According to Newton's law of universal gravitation, we have that acceleration due to gravity is proportional to the altitude.
To solve this problem, use the mathematical expression below;
g[tex]_{e}[/tex] = g(1 - [tex]\frac{2h}{R}[/tex])
where g[tex]_{e}[/tex] is gravity on top of Everest
g is the gravity on the earth surface
h is the height of the mountain
R is the radius of the earth
g[tex]_{e}[/tex] = 9.8 (1 -[tex]\frac{2 x 8848}{6400000}[/tex] )
g[tex]_{e}[/tex] = 9.8 (1-0.002765) = 9.77m/s²
The acceleration due to on top of Everest is 9.77m/s²
will the value of g be affected by the radius of the earth? consider the real shape of the earth. compare the acceleration due to gravity for the freely falling object in the poles of the earth and other regions.
Answer:
Yes, the value of g affected by the radius.
Explanation:
The formula for the force of gravity of 2 objects is
[tex]F_{gravity} = G\frac{m_{1}m_{2}}{r^2}[/tex], where m1 and m2 are the masses of the 2 objects, r is the radius, and G is the gravitational constant, which is approximately [tex]6.67 \cdot 10^{-11}[/tex].
Therefore, as the radius if bigger, the force of gravity is going to be smaller exponentially.
Can I have some help, please?
Answer:
yes you can gwet help with a whole lot of nothing
Explanation:
What’s the mass of the sample please help me!
Answer:
A. 0,11
Explanation:
Sorry if wrong. i hope this helps. thank you.
How far did the object travel by the end of eight seconds, according to the graph above?
A) It traveled 4 centimeters.
B) It traveled 8 centimeters.
C) It traveled 12 centimeters.
D) It traveled 20 centimeters.
Answer:
The object traveled 4 cm by the end of eight seconds. Correct: A)
Explanation:
Speed vs Time Graph
In a speed-time graph, speed is plotted on the vertical axis and time is plotted on the horizontal axis. If the graph is a horizontal line, the speed is constant, if the line is sloped up, the speed is increasing and the acceleration is positive and constant, and if the line is sloped down, the speed is decreasing and the acceleration is negative and constant.
The distance traveled by the object can be found by calculating the area under the graph and above the x-axis.
The graph provided shows two different zones: the first 4 seconds, the speed is constant at 1 cm/s, and the last 4 seconds, the speed is zero, i.e. the object is not moving.
The area behind the first zone is a rectangle of height 1 cm/s and base 4 sec, thus the distance is 1 * 4 = 4 centimeters.
The second zone corresponds to an object at rest, thus no distance is traveled.
The object traveled 4 cm by the end of eight seconds.
A) Correct. As shown above
B) The distance traveled is 4 cm. Incorrect
C) The distance traveled is 4 cm. Incorrect
D) The distance traveled is 4 cm. Incorrect
To win the game, a placekicker must kick a football from a point 44 m (48.1184 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 24 m/s at an angle of 31◦
from the horizontal.
The acceleration of gravity is 9.8 m/s^2.
By how much vertical distance does the ball clear the crossbar?
Answer in units of m.
Answer:
The distance by the ball clear the crossbar is 1.15 m
Explanation:
Given that,
Distance = 44 m
Speed = 24 m/s
Angle = 31°
Height = 3.05 m
We need to calculate the horizontal velocity
Using formula of horizontal velocity
[tex]u_{x}=u\cos\theta[/tex]
Put the value into the formula
[tex]u_{x}=24\cos(31)[/tex]
[tex]u_{x}=20.5\ m/s[/tex]
We need to calculate the vertical velocity
Using formula of vertical velocity
[tex]u_{y}=u\sin\theta[/tex]
Put the value into the formula
[tex]u_{y}=24\sin(31)[/tex]
[tex]u_{y}=12.3\ m/s[/tex]
We need to calculate the time
Using formula of time
[tex]t=\dfrac{d}{u_{x}}[/tex]
Put the value into the formula
[tex]t=\dfrac{44}{20.5}[/tex]
[tex]t=2.1\ sec[/tex]
We need to calculate the vertical height
Using equation of motion
[tex]h=u_{y}t+\dfrac{1}{2}at^2[/tex]
Put the value into the formula
[tex]h=12.3\times2.1-\dfrac{1}{2}\times9.8\times(2.1)^2[/tex]
[tex]h=4.2\ m[/tex]
We need to calculate the distance by the ball clear the crossbar
Using formula for vertical distance
[tex]d=h-3.05[/tex]
Put the value of h
[tex]d=4.2-3.05[/tex]
[tex]d=1.15\ m[/tex]
Hence, The distance by the ball clear the crossbar is 1.15 m
How far does a car that weighs 5,000 n go
if 18,000 j of work is done on it?
Answer:
d = 3.6 m
Explanation:
The formula for Work: W = F * d
Where F is force in Newtons (N) and d is the distance travelled in meters (m). In order to do work, you need to force an object throughout a distance.
That's why pushing a wall (that doesn't move) is not considered work, because you can't move the wall to a distance.
So what we know:
F = 5,000 N
W = 18,000 J
d = W / F (according to the formula, right?)
d = 18,000 / 5,000 = 3.6 m
Propane burns in oxygen to produce carbon dioxide and water. What are the chemical formulas of the reactants and products? The formulas of the reactants are C3H8, O, and CO2. The formula of the product is H2O. The formulas of the reactants are C3H8 and O2. The formulas of the products are CO and H2O. The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.
Answer:
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.
Explanation:
Propane is the third member of the alkane group with the general formula CnH2n+2. According to this question, propane burns in oxygen to produce carbon dioxide and water. This means that propane and oxygen are the reactants of this reaction while carbon dioxide and water are the products.
The chemical formulas of the respective reactants and products are as follows:
REACTANTS:
Propane = C3H8 i.e C3H(2×3)+2
Oxygen = O2
PRODUCTS:
Carbon dioxide = CO2
Water = H2O
The balanced chemical reaction is as follows:
C3H8 + 5O2 ----> 3CO2 + 4H2O
Answer:
Option C would be your answer!
The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O.
Also, for the second part, the answer is Option B!
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
Explanation:
This is correct on Edge! :D
I hope this helped!
Question 8 of 10
Which term describes the sum of all forces acting on an object
A Free body force
B. Centripetal force
0, Nat force
D. Reaction force
Answer:
Net force ! because it the total force that being addednon the obj !
Which solutions have a density greater than 1.0 g/mL?
Mass = 888 g Volume = 800 mL
Mass = 7.8 g Volume = 8.7 ml
Mass = 725 g Volume = 715 mL
Mass = 1.3 g Volume = 1.1 ml
Mass = 18 g Volume = 19 mL
Mass = 1.25 g Volume = 1.78 ml
The solutions that have their mass greater than their volumes are:
Mass = 888 g Volume = 800 mL Mass = 725 g Volume = 715 mL Mass = 1.3 g Volume = 1.1 mlThe ratio of the mass of a substance to its volume is known as the density of the substance. Mathematically;
Density = Mass/Volume
For any solution to have a density greater than 1, the mass of the substance must be greater than its volume.
For the given option, the solutions that have their mass greater than their volumes are:
Mass = 888 g Volume = 800 mL Mass = 725 g Volume = 715 mL Mass = 1.3 g Volume = 1.1 mlLearn more here: https://brainly.com/question/17780219
It
starts at position 0 and moves to the right until it arrives at
position 1. It then turns around and stops at position 2.
What is the average velocity of the ghost for the entire trip
if the entire trip takes 7 seconds?
0 -1.42 m/s
-1.42
1.42
O 1.42 m/s
Which phenomenon is an example of electric discharge?
A) Friction
B) Lightning
C) Magnetism
D) Static cling
An immersion heater is rated 120w. How long does it take the heater to raise the temperature of 1.2kg of water by 15°c.
Answer:
dmakqkwnwj fddfgdddwsf
When your mass increases, your weight remains constant , True or false
I think the answer is true
How fast Will a brick be going after it falls for 2.5 seconds?
Answer:
25 m/s
Explanation:
Initial Velocity = 0 m/s
Time = 2.5 m/s
Acceleration due to gravity = 9.8
Final Velocity = ?
By the formula,
[tex]V_{f} = V_{i} + at[/tex]
[tex]V_{f}= 0 + 10 x 2.5[/tex]
Vf = 25 m/s
After 2.5 seconds the velocity of ball will be 24.5 m/s.
We have a brick falling from a certain height.
We have to find the velocity of the brick after 2.5 seconds of falling.
What do you mean by Free fall ?The motion of any object under the influence of gravity alone is called as free fall.
According to the question -
Initial velocity = u = 0 m/s
Final velocity = v m/s (say)
g = 9.8 m/[tex]s^{2}[/tex]
t = 2.5 seconds
Using the first equation of motion -
v = u + at
v = 0 + gt
v = 9.8 x 2.5 = 24.5 m/s
Hence, after 2.5 seconds the velocity of ball will be 24.5 m/s.
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On an average, a human heart is found to beat 75 times in a minute. Calculate its frequency and time period.
Frequency=
75/60=5/4=1.25s^{-1}Now
Time period:-
[tex]\\ \rm{:}\dashrightarrow \dfrac{1}{\nu}[/tex]
[tex]\\ \rm{:}\dashrightarrow \dfrac{1}{1.25}[/tex]
[tex]\\ \rm{:}\dashrightarrow \dfrac{4}{5}[/tex]
[tex]\\ \rm{:}\dashrightarrow 0.8s[/tex]
which of the following would typically be used to express speed
Answer:
One term that could be used as speed is sprint or rush
Explanation:
what is steam engine it's action and reaction
Explanation:
steam shooting out through 2 l shaped Falls creators and action force that is accompanied by backward reaction in force in opposite direction
The direct transfer of thermal energy between particales of matter that are touching is called
Which type of force is shown in the image?
Answer:
D contact force
Explanation:
What do magnesium and chlorine react to form?
A.
MgCl2
B.
Mg2Cl
C.
MgCl
D.
Mg2Cl2
HELP FAST PLEASE
Which would have a longer vector arrow?
a: A vector representing 100 miles/hour north
b: Avector representing 100 miles/hour east
c: A vector representing 100 miles/hour south
d: They would all be the same length
All the vectors would all be the same length.
option D is the correct answer.
What is the magnitude of a vector?
The magnitude of a vector is the length of the vector. This is the absolute value of the vector.
The length of a vector describes its magnitude, so the magnitude or length of the given vectors is determined as follows;
A vector representing 100 miles/hour north ⇒ magnitude = 100 miles / hour
A vector representing 100 miles/hour east ⇒ magnitude = 100 miles / hour
A vector representing 100 miles/hour south ⇒ magnitude = 100 miles / hour
Thus, all the given vectors have equal magnitude but different directions.
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A group of stars connected by lines is circled and labeled Saturn.
The night sky is filled with images of wild animals. Which animal is the circled constellation named after?
scorpion
serpent
snake
salamander
An Alaskan rescue plane traveling 41 m/s
drops a package of emergency rations from
a height of 165 m to a stranded party of explorers.
The acceleration of gravity is 9.8 m/s
2.What is the vertical component of the velocity
just before it hits? (Choose upward as the
positive vertical direction)
Answer in units of m/s.
Answer:
-56.9 m/s
Explanation:
Given:
Δy = -165 m
v₀ = 0 m/s
a = -9.8 m/s²
Find: v
v² = v₀² + 2aΔy
v² = (0 m/s)² + 2 (-9.8 m/s²) (-165 m)
v = -56.9 m/s
A rock is thrown upward with an initial velocity of 29m/s. What is the rock's maximum height?
43 m
35.8 m
14.5 m
O 58 m
An airplane flying at a speed of 130 mi/h (58.1 m/s) and at an altitude of 4.9 km drops a food package. Without a parachute, at what angle (degrees) below the horizontal will the package strike the ground?
The food package will strike the ground at 11 degrees below the horizontal.
Time for the food package to hit the groundThe time for the food package to hit the ground is calculated as follows;
h = vt + ¹/₂gt²
let the initial velocity be horizontal
4900 = 0(t) + (0.5 x 9.8)t²
4900 = 4.9t²
t² = 4900/4.9
t² = 1,000
t = √1,000
t = 31.62 s
Final speed of the food package when it hits groundvf(y) = vo + gt
vf(y) = 0 + (31.62 x 9.8)
vf(y) = 309.88 m/s
Angle of projectionThe horizontal component of the speed will be constant, while vertical component will change
[tex]tan(\theta ) = \frac{V_y}{V_x} \\\\\theta = tan^{-1} (\frac{V_y}{V_x})\\\\\theta = tan^{-1} (\frac{309.88}{58.1} )\\\\\theta = 79^0[/tex]
Angle below the horizontal = 90 - 79 = 11⁰
Thus, the food package will strike the ground at 11 degrees below the horizontal.
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