Answer:
Explanation:(3.9x100)(4.1x10,000)
390x41,000
15,990,000
3. A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds.
Find the car's average acceleration.
Answer:
10 km/s^2
Explanation:
Acceleration = velocity/time
a= 70km/7s
= 10km/s^2
Can someone explain how exactly to calculate the net force? Do you subtract the smaller number from the larger number? Any help would be appreciated!
Explanation:
Let's say right is positive and left is negative.
F₁ = -150 N
F₂ = 220 N
Fnet = F₁ + F₂
Fnet = -150 N + 220 N
Fnet = 70 N
The magnitude of Fnet is 70 N, and since it's positive, the direction is to the right.
And since Fnet isn't 0, the force is unbalanced and the motion is changing.
If you were given a number, say the number “22”, how would you know what it meant? You would have to give it a ___, or people might think you were talking about bowling ball or flowers!
A race-car driver achieved a velocity of 53 m/s in 14 seconds after taking off from rest at the starting line. What was the average acceleration during this time?
The average acceleration of the race - car driver would be 3.78 m/s².
What is average acceleration?Average acceleration is the rate of change of velocity per unit time. Mathematically -
a = dv/dt [instantaneous acceleration]
dv = adt
∫dv = ∫adt
∫dv = a ∫dt
v₂ - v₁ = a(t₂ - t₁)Δv = aΔt
a = Δv/Δt
Given is a race-car driver who achieved a velocity of 53 m/s in 14 seconds after taking off from rest at the starting line.
We can write -
Initial velocity of the race-car driver [u] = 0 m/s
Final velocity of the race-car driver [v] = 53 m/s
Time taken by the race-car driver [Δt] = 14 seconds
Using the formula for acceleration, we get -
a = Δv/Δt = (v - u)/Δt
Substituting the values -
a = (53 - 0)/14
a = 3.78 m/s²
The acceleration will be 3.78 m/s²
Therefore, the average acceleration of the race - car driver would be 3.78 m/s².
To solve more questions on kinematics, visit the link below-
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A group of pedestrians is standing on a corner, waiting for the light to change. A driver runs the red light and narrowly misses another car. According to work on the two-step process of making attributions, who is most likely to point out how quickly the light changed from amber to red when explaining the near accident?
Here are the options that complete the question;
A) Dan, who is searching in his pocket for his house keys
B) Cynthia, who is mentally rehearsing her shopping list
C) Jeff, who is trying to think of what to cook for dinner
D) Wesley, who is feeling alert and hasn't a concern in the world
Answer:
d. Wesley, who is feeling alert and hasn't a concern in the world
Explanation:
We can reach this conclusion because according to the two-step process of making attributions, we need to consider;
how the person's personality could influence their action and then,the situation the person is in.Hence, since the personality of Wesley is that of one who is feeling alert and hasn't a concern in the world, we would expect him in such a situation to be the one who is most likely to point out how quickly the light changed from amber to red when explaining the near accident.
Suppose that John lives on a square block that is 180 yards per side, and in the evenings, he walks with his dog around the block for a little exercise.
b. If John walks once around the block, what is his final displacement?
O yards
720 yards
360 yards
540 yards
Answer: A
Zero yard.
Explanation:
Given that that John lives on a square block that is 180 yards per side, and in the evenings, he walks with his dog around the block for a little exercise.
Constant speed does not necessarily mean constant velocity.
If John walks once around the block, his final displacement will be equal to zero yard.
Because displacement is the distance between the initial and final position of an object. When an object returns to its original position, displacement will be therefore equal to zero yard.
Therefore, the best answer is option A
Answer:
720
Explanation:
A high powered rifle can shoot a bullet at a speed of 1500 mi/hr. On the moon, with almost no atmosphere and an acceleration due to gravity of 1.6 m/s2, a bullet shot straight into the air would take how long to return to the moon's surface? On Earth, a standard .30 caliber bullet fired from a rifle pointed straight up would rise to an altitude of 9,000 feet (2,743.2 meters) in 18 seconds, and then would return to Earth in another 31 seconds. How much influence does the atmosphere have on a bullet fired from the surface of the Earth?
Answer:
Explanation:
On the Moon :----
1500 x 1.6 = 2400 m /s is initial velocity of bullet .
g = 1.6 m /s²
v = u - gt
0 = 2400 - 1.6 t
t = 1500 s
This is time of ascent
Time of decent will also be the same
Total time of flight = 2 x 1500 = 3000 s
On the Earth : ---
v = u - a₁ t
0 = u - a₁ x 18
u = 18a₁
v² = u² - 2 x a₁ x 2743.2
0 = (18a₁ )² - 2 x a₁ x 2743.2
a₁ = 16.93
For downward return
s = ut + 1/2 a₂ x t²
2743.2 = 0 + .5 x a₂ x 31²
a₂ = 5.7 m /s²
If d be the deceleration produced by air
g + d = 16.93 ( during upward journey )
g - d = 5.7
g = (16.93 + 5.7) / 2
= 11.315 m / s
d = 5.6 m /s²
So air is creating a deceleration of 5.6 m /s².
An object is moving to the left and is slowing down. its acceleration is
Answer:
According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.
An object is moving to the left and is slowing down. its acceleration is acting in opposite direction of motion, that is, in right direction.
What is acceleration?The rate at which velocity changes with time in terms of both speed and direction is referred to as acceleration. A point or object moving in a straight line is accelerated if it accelerates or decelerates. Even if the speed is constant, motion on a circle is accelerated because the direction is constantly changing. Both effects contribute to acceleration in all other types of motion.
Acceleration is a vector quantity because it has both a magnitude and a direction. Velocity is a vector quantity as well. The change in the velocity vector in a time interval divided by the time interval is defined as acceleration.
Hence, an object is moving to the left and is slowing down. its acceleration is acting in opposite direction of motion.
Learn more about acceleration here:
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A driver who does not wear a seatbelt continues to move forward with a speed of 18.0 m/s (due to inertia) until something solid like the steering wheel is encountered. The driver now comes to rest in a much shorter distance-perhaps only a few centimeters. Find the magnitude of the net force acting on a 65.0 kg driver who is decelerated from 18.0 m/s to rest in 5.00 cm. A driver who does not wear a seatbelt continues to move forward with a speed of 18.0 (due to inertia) until something solid like the steering wheel is encountered. The driver now comes to rest in a much shorter distance-perhaps only a few centimeters. Find the magnitude of the net force acting on a 65.0 driver who is decelerated from 18.0 to rest in 5.00 . F=3240N F=1.173×104N F=2.113×105N F=4.213×105N
Answer:
F = 2.113 x 10⁵ N
Explanation:
First we need to calculate the deceleration of the driver by using 3rd equation of motion:
2as = Vf² - Vi²
where,
a = deceleration = ?
s = distance = 5 cm = 0.05 m
Vf = Final Velocity = 0 m/s
Vi = Initial Velocity = 18 m/s
Therefore,
2a(0.05 m) = (0 m/s)² - (18 m/s)²
a = (- 324 m²/s²)/0.1 m
a = - 3240 m/s²
where, negative sign represents deceleration
From Newton's Second Law of Motion:
F = ma
F = (65 kg)(-3240 m/s²)
F = - 2.106 x 10⁵ N
So, he closest answer is:
F = 2.113 x 10⁵ N
The corpus callosum is comprised of more than 200 million axons that connect the hemispheres of the brain. Please select the best answer from the choices provided T F
Hello, love! The answer is True, or T, on Edge2020.
Hope this helped!
~ V.
Answer:
'Tis True my friends
Explanation:
7. What major disaster followed the comet of 1664?
Answer:
The plague and the london fires.
Explanation:
Lots of war happened after that. They had an outbreak as we known called the Plague. After the Comet, lots of fires were set in London.
what is the formula of taking out distance
Answer:
formula for Distance is Speed ×time
Explain why a schoolbus appears to be yellow.
A. Yellow light is absorbed, while all other colors are reflected.
B. All colors are reflected, but yellow is reflected at a more direct angle.
C. All colors are reflected, but only yellow makes it to your eyes.
D. Yellow light is reflected, while all other colors are absorbed.
what is a cosmic horizon
Answer:
A measure of distance from which one could possibly retrieve information. This observable constraint is due to various properties of general relativity, the expanding universe,and the physics of Big Bang cosmology. Cosmology horizon set the and scale of the observable universe. Hope this helps!!!
Answer:
A cosmological horizon is a measure of the distance from which one could possibly retrieve information.
Explanation:
Heating effect of current is not always useful for us. Support your answer with example
Answer:
is correct
Explanation:
in my think, first this due to ray emitted from the light those ray may be affect our skin or party of body.
which best describes what happens with the sonar to sound pulses from a ship after they hit the ocean floor?
Answer:
With sonar, what happens to sound pulses from a ship after they hit the ocean floor? ... They bounce back to the ship.
Explanation:
A crate is dragged across an ice covered lake. The box accelerates at 0.08 m/s2 and is pulled
by a 47 N force. What is the mass of the box?
Given parameters:
Rate of acceleration of the box = 0.08m/s²
Force applied to the box = 47N
Unknown:
Mass of the box = ?
The force applied on a body is push or pull on it to move it in a specific direction. Force causes the motion of a body.
Mathematically, force is expressed as the product of mass and acceleration;
Force = mass x acceleration
Input parameters and solve for mass;
47 = mass x 0.08
mass = [tex]\frac{47}{0.08}[/tex]
mass = 587.5Kg
The mass of the box is 587.5Kg
Its like almost 12 pm rn and i have school tomorrow so i dunno why im still up but i just wanna know how big the world is. like in miles how long is it all the way around??? i could just look it up but i like to socialize sooooo someone tell me please :)
I dont know what subject to put this under lol
2. Determine the number of significant figures in each of the following:
a) 3427 b) 0.00456 c) 123,453
d) 172 e) 0.000984 f) 0.502
g) 3100.0 x 102 h) 0.0114 x 104 i) 107.2
j) 0.0000455 k) 2205.2 l) 30.0 x 10-2
m) 0.982 x 10-3 n) 0.0473 o) 650.502
p) 3.03 x 10-1 q) 20.4 x 105 r) 1.29
s) 0.00565 t) 1362205.2 u) 450.0 x 103
v) 1000 x 10-3 w) 546,000 x) 546,000
Answer:
a, 4
b, 3
c, 6
d, 3
e, 3
f, 3
g, ambiguous
h,
Protein helps the body?
On a hot summer day, air temperature is 30 °C and the actual vapor pressure is 30 mb: what is the approximate relative humidity
(RH)?
Answer:
chgfsgfsgsahfsgfggfsgasgsgfgfggdfdsseeerasfasfafvvdavadvdafdfgdb
Explanation:
bbfgfsgssdfeffsdfdffdgsgggfffrterrwrwftgwrtrtqvggsgfgdfhfghh
Two students push on a crate to slide it across the floor. One student exerts a force of
6 N to the east, and the second exerts a force of 3 N to the south. What is the
magnitude of the net force the students exert on the crate? Report the answer to 2
decimal places.
Explanation:
[tex]net \: force \: = \sqrt{ {6 }^{2} + {3}^{2} + 2 \times 3 \times 6 \cos(90) } = 6.7 N[/tex]
pls help
If heat is removed from point E and the temperature had not changed, the substance will
A. Condense
B. Boil
C. Melt
D. Evaporate
Answer:
melt
Explanation:
hope it helps you plz mark me brilliantest
Answer:
i think E hola
Explanation:
I dont know
Scientific notation is a method of expressing very small and very large numbers *
yes
No
In a closed system that has 45 J of mechanical energy, the gravitational
potential energy of a ball rolling down an inclined plane decreases from 8 J to
Answer:
the answer is d
Explanation:
I just did this test
SOMEONE PLEEEAASSEE HELP ME T.T . This is due today! 40 points!!! I need to know how to find the x-axis.
Make a graph in which you plot Vertical height vs. Horizontal Distance. You are given the y axis data (see below) and you must use this data to determine the x axis data you will plot. Assume the following y axis. ( you need to make a calculated column for x distance )
Y = 1 m
Y = 2 m
Y = 5 m
Y = 10 m
Y = 15 m
Y = 25 m
Y = 35 m
Y = 65 m
(Assume that velocity (Vox) remains constant at 1m/sec)
Answer:
GET NOOBED BEECH
Explanation:
asfasdfasdfasdfasdfasdf
What is the distance traveled by a vehicle in 12 minutes if speed is 35 km/h
Answer:
7km
Explanation:
What color in the visible spectrum has the highest energy?
A. red, because it has the longest wavelength
B. red, because it has the shortest wavelength
c. violet, because it has the shortest wavelength
D. violet, because it has the longest wavelength
Answer:
c. violet, because it has the shortest wavelength
if on average you walk 1.20 meters every second , how long do you walk i one hour?
Answer:
Explanation:
En cuánto tiempo se pueden caminar 20 km? Una persona sana, acostumbrada a andar camina a unos 4 o 5 kilómetros/hora, en terreno llano. Puede tardar 5 horas o 4.
Answer:
4,320meters
Explanation:
Which statement best describes how scientists and engineers work together
in the research and development cycle?
A. Scientists develop a new technology, and then engineers test it by
doing experiments.
B. Engineers come up with scientific questions when they are
developing their design, and scientists do research to answer
them.
C. Scientists test designs made by engineers and then use the
results to improve the designs.
D. Engineers make a scientific discovery, and then scientists perform
research to verify it.
B. Engineers come up with scientific questions when they are
developing their design, and scientists do research to answer
them
Answer:
Yeah that's right
Explanation:
