Answer:
The car's acceleration is 5m/s^2
Explanation:
acceleration is the change in velocity per unit time.
so this formula will work.
V^2= u^2 + 2as
20^2 = 0^2+ 2a (s)
What does Newton's Third Law describe?
Answer:
Newton's third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. The third law is also known as the law of action and reaction.
Explanation:
Examples of Newton's third law of motion are ubiquitous in everyday life. For example, when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air. Engineers apply Newton's third law when designing rockets and other projectile devices.
Explanation:
when two body interact.........
Consider a business jet of mass 38000 kg in takeoff when the thrust for each of two engines is 20000 N . What is the acceleration?
Answer:
Accelaration is 0.526 m/s²
Explanation:
Data :
Mass = m = 38000 kg
Force = F = 20000 N
According to newton second law of motion
F = ma
⇒ a = F/m = 20000/38000
a = 0.526 m/s²
What is the most important physics principle involved in bungee Jumping and how would I put it in a sentence?
A runner wants to run 12.0 km . Her running pace is 8.2 mi/hr . How many minutes must she run? Express your answer using two significant figures.
Answer:
53 minutes
Explanation:
To solve this problem, we need to use common proportions to convert.
= 11.7km * 1mi/1.61km * 1hr/8.2mi * 60min/hr
≈ 53 minutes
Best of LUck!
QUESTION 1 Linear Motion
(a) A small coin is dropped from the height of the Spire in Dublin's city centre, a height of 120 metres.
(i) Calculate the speed of the coin just bạfore it hits the ground. Be sure to show all your work.
(ii) Is your calculated speed realistic? Explain your answer.
Explain the answer please
Answer:
48.51ms / 174.6 km/h
Explanation:
y = 1/2 x g x t^2 v = g x t
when y = 120m
120 = 1/2 x 9.8 x t^2
t^2 = 24.49
t = 4.95s
when t = 4.95s
v = 9.8 x 4.95
v = 48.51 m/s = 174.6 km/h
I'd say its realistic. But I don't really know that sry
Explain why for an observer at the North Pole the Sun changes its altitude in the sky over the year, but the stars do not.
Answer:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Explanation: sorry that i am late this came up late on my screen
The process of tilting the earth's axis is primarily responsible for the alteration in seasons. This reason is also validated by an observer at the North Pole the Sun changes its altitude in the sky over the year.
Why is the axis of the earth tilting?The axis of the earth is tilting because it is strongly impacted by the process of mass distribution over the planet Earth. The large accumulation of land mass and ice sheets in the northern hemisphere makes the top of the earth too heavy.
It is commonly seen throughout the year that different parts of Earth receive the Sun's most direct rays at different times. According to this, when the North Pole is tilted toward the Sun, it is found that there will be summer in the Northern Hemisphere.
Therefore, the process of tilting the earth's axis is primarily responsible for the alteration in seasons. This reason is also validated by an observer at the North Pole the Sun changes its altitude in the sky over the year.
To learn more about Earth's tilting, refer to the link:
https://brainly.com/question/8678564
#SPJ2
What is the name of a loop that electricity flows through?
a Circuit
b switch
c bulb
insulator
Answer:
The first options is the ans(Circuit) it should have been electric circuit
How can we have a legitimate criminal justice system if there are no mutually agreed-upon standards of conduct?
It's impossible to have a legitimate criminal justice system if there are no
mutually agreed-upon standards of conduct.
What is Justice system?justice system are the institutions set up by the government to ensure
crime is reduced by punishing offenders and ensuring fair hearing is given
to the accused.
In a situation where there are no mutually agreed-upon standards of
conduct, it can lead to anarchy and a lot of conflicts in the area.
Read mire about Justice system here https://brainly.com/question/7207817
Please help
Calculate the effective resistance for:
Answer:
R1 and R2 denote the resistances of the labelled edges. For a circuit with resistances R1 and R2 in series or in parallel as in Figure 2, the effective resistance can be calculated by using the following rules. Rab = R1 + R2. Proof.
Explanation:
^^^^^^^^^^^^^
How much time does it take for cheetah to accelerate at 20m/s from rest to a speed of 40m/s? =2sec
The time taken for the cheetah to accelerate from rest to 20 m/s is 2 seconds
What is acceleration?:This can be defined as the rate of change of velocity of a body, or it can be defined as the change in velocity of a body, per time. The S.I unit of acceleration is m/s²
To calculate the amount of time it takes a cheetah to accelerate from rest to 40 m/s, we use the formula below.
Formula:
a = (v-u)/t...................... Equation 1Where:
a = acceleration of the cheetahv = Final speed of the cheetahu = initial speed of the cheetaht = time takenmake t the subject of the equation
t = (v-u)/a................. Equation 2From the question,
Givnen:
a = 20 m/s²v = 40 m/su = 0 m/s (from rest)Substitute these values into equation 2
t = (40-0)/20t = 2 seconds.Hence, The time taken for the cheetah to accelerate from rest to 20 m/s is 2 seconds
Learn more about acceleration: https://brainly.com/question/605631
Anyone good at physics, that can help me? Will give 100 point!!!
You don't need to show your work I just need the answer. Thank you.
Starting from rest, a 10 kg block slides 11.9 m down a frictionless ramp (inclined at
30◦ from the floor) to the bottom. The block then slides an additional 21.1 m along the floor before coming to stop. The acceleration of gravity is 9.8 m/s2.
A) Find the speed of the block at the bottom of the ramp.
B)Find the coefficient of kinetic friction between block and floor
C)Find the magnitude of the mechanical energy lost due to friction.
Hi there!
Part 1:
Assuming this is from the work-energy unit, we can use the work-energy theorem to solve.
Since the block starts from rest:
Initial energy = GPE = mgh
Final energy = KE = 1/2mv²
We are only given the diagonal distance of the ramp, so we must solve for its height using trigonometry.
sin(30) = O/H
Hsin(30) = 11.9sin(30) = 5.95 m
Now, solve by setting the GPE and KE equal:
mgh = 1/2mv²
gh = 1/2v²
v = √2gh
v = √2(9.8)(5.95) = 10.8 m/s
Part 2:
Now, we can use the equation for work:
W = ΔKE
The final velocity of the block after sliding is 0 m/s, so:
W = 1/2mv²
Recall the equation for work:
W = Fdcosθ
Since friction works AGAINST motion, cos(180) = -1.
Thus, the work done by friction is:
W = -Fd
Recall the equation for kinetic friction:
F = μmg
Thus:
0 = 1/2mv² - Fd
0 = 1/2mv² - μmg
μmgd = 1/2mv²
Cancel out the mass and rearrange to solve for the coefficient of friction:
μgd = 1/2v²
μd = 0.5v²/gd
μ = 0.5(10.8²)/(9.8)(21) = 0.283
Part 3:
The energy lost due to friction is equivalent to the WORK DONE by friction, which is equivalent to the initial kinetic energy of the block at the bottom of the ramp.
Thus:
W = 1/2mv² = Fd
W = 1/2(10)(10.8²) = 583.1 J
If you were standing right on the North Pole and wanted to walk to the north magnetic pole would you head east, west, or south? Explain
Help please
Answer:
Explanation:At the north pole every direction is south or up
what will happen if we heat metal for long time
Answer:
the metal will melt
Explanation:
from solid to liquid
Grass clippings are found to have an average length of 5.4 cm when a law is mowed 16 days after the previous mowing. What is the average speed of growth of this grass in cm/day
8.
A moon orbits a planet that has a mass of 8.44 x1028 kg. If the speed of the moon
along its orbital path is 4.27 x 104 m/s, what is the radius of its orbit?
A. 1.59 x10 m
B. 3.09 x10 m
C. 1.32 x1014 m
D. 9.53 x1018 m
Answer:
B.
Explanation:
brainlist
What technologies are astronomers using to look for life on other planets? Why?
Answer:
Radio signals and telescopes
Explanation:
I believe that they would uses those because with a telescope you can see things if they are millions of miles away from earth or where ever. And with radio signals you could try and see if there is any sign of life beyond on the knowledge we know of the universe.
Please help with this question!
Answer: Constant Speed
Explanation:
Object's speed does no(sic) change over its entire distance.
No change in speed means that the object is either at constant speed, or is stationary.
A force F = −77 N is applied to an object with mass m = 74 kg. What is the acceleration of the object in m/s2
Answer:
a = 1.04m/s²
Explanation:
a =f/m
a =77N/74kg
a = 1.04,m/s²
Please answer these questions correctly (photo is attached) I’ll give brainliest
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75-kg man just before contact with the ground has a speed of 5.7 m/s.
(a) In a stiff-legged landing he comes to a halt in 1.5 ms. Find the average net force that acts on him during this time.
(b) When he bends his knees, he comes to a halt in 0.14 s. Find the average force now.
(c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of these forces, find the force of the ground on the man in parts (a) and (b).
stiff legged landing
N
bent legged landing
N
Kingda Ka has a maximum speed of 57.2 m/s. Determine the height of the hill on this roller coaster. Explain to get full credit, show work!
This question involves the concepts of the law of conservation of energy, kinetic energy, and potential energy.
The height of the hill is "166.76 m".
LAW OF CONSERVATION OF ENERGY:According to the law of conservation of energy at the highest point of the roller coaster ride, that is, the hill, the whole (maximum) kinetic energy of the roller coaster is converted into its potential energy:
[tex]Maximum\ Kinetic\ Energy\ Lost = Maximum\ Potential\ Energy\ Gain\\\\ \frac{1}{2}mv_{max}^2=mgh\\\\ h=\frac{v_{max}^2}{2g}[/tex]
where,
h = height of the hill = ?[tex]v_{max}[/tex] = maximum velocity = 57.2 m/sg = acceleration due to gravity = 9.81 m/s²Therefore,
[tex]h=\frac{(57.2\ m/s)^2}{2(9.81\ m/s^2)}\\\\ [/tex]
h = 166.76 m
Learn more about the law of conservation of energy here:
https://brainly.com/question/101125
Can water act as a wave medium?
Answer:
[tex]\huge\underline\color{green}{Answer \: ☘}[/tex]
In the case of a water wave in the ocean, the medium through which the wave travels is the ocean water. In the case of a sound wave moving from the church choir to the pews, the medium through which the sound wave travels is the air in the room.
hope helpful~
PLZ HELP photosynthesis transforms (blank)into chemical (blank)suger . cellular respration releasses the (blank) from food by (blank) suger.
Answer is:
Photosynthesis transforms light energy into chemical energy. Cellular respration releasses the carbon dioxide from food into the air.
hope this helps :)
What is the acceleration of an object that is initially moving at 10.5 m/s and is moving at 13.5 m/s after 2 seconds
Answer:Hope it will help you.
Explanation:
Answer:
[tex]\boxed {\boxed {\sf a= 1.5 \ m/s^2}}[/tex]
Explanation:
Acceleration is the change in velocity over time, so it is calculated using the following formula.
[tex]a= \frac{v_f-v_i}{t}[/tex]
The object is initially moving at 10.5 meters per second. After 2 seconds, it is moving at 13.5 meters per second.
[tex]v_i[/tex]= 10.5 m/s[tex]v_f[/tex]=13.5 m/s t= 2 sSubstitute the values into the formula.
[tex]a= \frac{13.5 \ m/s - 10.5 \ m/s}{2 \ s}[/tex]
Solve the numerator.
[tex]a= \frac{3 \ m/s}{2 \ s}[/tex]
Divide.
[tex]a=1.5 \ m/s/s \\a= 1.5 \ m/s^2[/tex]
The acceleration of the object is 1.5 meters per second squared.
A high-speed train traveled at a rate of 120 kilometers per hour for 10 hours.
What distance did the train travel?
a. 12 kilometers
b. 20 kilometers
C. 110 kilometers
D. 1,200 kilometers
Answer:
S = V * t
S = 120 km/hr * 10 hr = 1200 km
When acted upon by an unbalanced force, an object at rest will do what?
Answer:
When unbalanced forces act on an object at rest, the object will move. In the two examples mentioned earlier, the net force on the object is greater than zero. Unbalanced forces produced change in motion (acceleration) and the receivers of the forces - the piano and the rope - moved.
A jogger runs 5 km in 0.6 h, then 9 km in 0.5 hr. What is the average speed of the jogger
Note: The values given in the answer are rounded off to the nearest hundredth.
834 cg convert to dag
Answer:
I believe it is 0.834
How do we measure the world around us?
A car with a momentum (impulse) of 20,000 kg m/s collides with a wall and comes to a rest in 0.1 seconds. How much
force is absorbed by the car (and the driver)?
Answer:
» Force is 200,000 Newtons
Explanation:
[tex]{ \tt{force = \frac{impulse}{time} }} \\ \\ { \tt{force = \frac{20000}{0.1} }} \\ \\ { \tt{force = 200000 \: newtons}}[/tex]
