Answer:
8cm^3
Explanation:
length*width*height=volume
2*2*2=8
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.
what will happen if we heat metal for long time
Answer:
the metal will melt
Explanation:
from solid to liquid
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
A rocket is launched straight up from Earth's surface at a speed of 15,000 m/s. What is its speed when it is very far away from the earth
Answer:
1/2 m v2^2 = 1/2 m v1^2 - G M m / R conservation of energy
v1^2 - v2^2 = 2 G M / R rearranging terms
2 G M / R = 2 * 6.67 * 5.98 / 6.37 E7 = 1.25E8
v1^2 - v2^2 = 1.25E8
v2^2 = v1^2 - 1.25E8 = (1.5^2 - 1.25) * E8
v2 = 1.00E4 = 10,000 m/s
When does an object have No kinetic energy?
A. When it is at rest.
B. When it’s moving very slowly.
C. When the only force that is acting on it is gravity.
D. When it has no electrical charge?
Explanation:[tex]\sf{hey\:}[/tex] [tex]\sf\cancel{mate\:Here\:}[/tex] [tex]\sf\red{is\:ur\:answer}[/tex]
when it is at rest.
because,
kinetic energy occurs when object in motion.
can,you mark me brainliest it's a request from.e to you
An object has no kinetic energy when it is at rest (Option A).
what is kinetic energy?Kinetic energy is the measure of the work that an object does by virtue of its motion. Simple activities like walking, jumping, throwing, and falling involve kinetic energy. In this article, let us familiarize ourselves with the concept of kinetic energy.
Kinetic energy is the energy an object possesses due to its motion. The formula for kinetic energy is
KE = 1/2mv²,
Where m is the mass of the object and
v is its velocity.
When an object is at rest, it has zero velocity, which means that its kinetic energy is also zero.
Option B is not correct because even if an object is moving very slowly, it still has some kinetic energy. The amount of kinetic energy it has will depend on its mass and velocity.
Option C is not correct because the force acting on an object does not affect its kinetic energy directly.
Kinetic energy is related to an object's motion, not its forces.
Option D is not correct because an object's electrical charge does not affect its kinetic energy directly. The amount of kinetic energy an object has is determined solely by its motion.
Learn more about kinetic energy here:
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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 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
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
A 10.0 kg mass is at the origin. A 20.0
kg mass is 0.500 m to the left of it,
and a 30.0 kg mass is 1.25 m to the
right of it. What is the net gravitational
force on the 10.0 kg mass?
Answer:
to the left
Explanation:
The gravitational force exerted between two objects is given by
were
G is the gravitational constant
m1, m2 are the masses of the two objects
r is their separation
And the force is always attractive.
Let's call
the mass on which we are calculating the net force.
The mass on the left is
and it is a distance of
r = 0.500 m
So, the gravitational force exerted by this mass on the 10.0 kg mass is
And the direction is to the left.
The other mass is
and its distance is
r = 1.25 m
to the right, so the force exerted by this other mass on the 10.0 kg mass is
And the direction is to the right.
Now, to find the net force, we just have to calculate the algebraic sum, taking into account that the two forces have different directions; taking right as a positive direction, the net force is:
And the negative sign means the direction of the net force is to the left.
10 application of physics
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
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 :)
Please answer these questions correctly (photo is attached) I’ll give brainliest
State how the strength of the X-rays can be increased.
Increasing the current in the filament.
Decreasing the potential difference between the cathode and anode.
Decreasing the current in the filament.
Increasing the potential difference between the cathode and the anode.
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
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
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
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.........
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:
^^^^^^^^^^^^^
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
834 cg convert to dag
Answer:
I believe it is 0.834
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
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.
As you explore the elements, look carefully at the model of each atom in the lower
right corner of the element's picture. What is one way the atoms differ from one
another?
A. They are not all particles of matter.
B. They are different shapes.
C. They are different sizes,
Answer:
They are different sizes.
Explanation:
Because electrons are what take up space in atoms, the result is that the size of the biggest filled orbital determines the size of the atom or ion. As you go down the periodic table, usually atoms get bigger because n gets bigger (there are electrons in higher shells).
How do we measure the world around us?
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
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
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.
Ernie speed walks at the rate of 20m/s in 5 seconds. Calculate the distance he traveled
Answer:
4m
Explanation:
you divide 20m/s by 5 seconds
What is the most important physics principle involved in bungee Jumping and how would I put it in a sentence?
