A train travelling at 20 m/s has 2 000 000 J of kinetic energy. What is the mass of
the train?
Answer:
10,000 kgExplanation:
The mass of the train can be found by using the formula
[tex]m = \frac{2k}{ {v}^{2} } \\ [/tex]
k is the kinetic energy
v is the velocity
From the question we have
[tex]m \frac{2(2000000)}{ {20}^{2} } = \frac{4000000}{400} = \frac{40000}{4} \\ [/tex]
We have the final answer as
10,000 kgHope this helps you
Answer:
10,000 kg
Explanation:
.
A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3.2 km in 3.5 min. How FAST (m/s) is the car moving after this time?
If a tennis ball has a velocity of 18 m/s and a momentum of 1.06 kg • m/s, what is the mass of the tennis ball in grams? Round the answer to two significant figures.
Answer:
58 g
Explanation:
Momentum = mass* velocity
P=mv
P= 1.06 kg*m/s
M=?
V=18 m/s
1.06 kg*m/s=m(18m/s)
M=0.058 kg
0.058kg = 58 g
Answer:
59
Explanation:
edge 2021
11. A ball rolls across a table of height 1.2 meters, leaves the table with a speed of ve, and lands 0.69m
from the edge of the table.
vo
1.2 m
-0.69 m
a. Find the time it takes the ball to fall from the edge of the table and reach position A in the picture
above.
Answer:
sorry don't know i just need points
Explanation:
A transformer has 1000 turns on the primary coil.
The voltage applied to the primary coil is 230V a.c,
How many turns are on the secondary coil if the output
voltage is 46 V a.c.?
A)20 B)200 C)2000 D4000 E)8000
Answer:
200
Explanation:
Given parameters:
Number of turns in primary coil = 1000 turns
Primary voltage = 230V
Secondary voltage = 46V
Unknown:
Number of turns in secondary coil = ?
Solution:
To solve this problem, we have to use the expression for solving problems related with transformers;
[tex]\frac{Vs}{Ns}[/tex] = [tex]\frac{Vp}{Np}[/tex]
Vs is the secondary voltage
Ns is the number of secondary turns
Vp is the primary voltage
Np is the number of primary turns
Now insert the parameters and solve;
[tex]\frac{46}{Ns}[/tex] = [tex]\frac{230}{1000}[/tex]
46 x 1000 = 230Ns
Ns = 200
why people bleed from nose while climbing uphill rapidly
Answer:
because the presure it puts on your body same as if you go to deep in the water
please help .-. its for physics
Answer:
your answer is correct
How can temperature influence the rate chemical reaction between an acid and a base that will make our rocket defy gravity and launch upward?
Answer:
Explanation:
Generally, an increase in temperature increases the rate of a chemical reaction. Consequently, when the temperature of a reaction is raised, the molecules present in the reaction interact faster by colliding with one another and surpassing the effective collision of such reaction to bring about a high reaction rate. Similarly, in the case of the rocket launch, the same process occurs as the temperature increase will cause an increase in the reaction rate leading the hydrogen from the acid to react explosively with the oxygen from the base to form water - this makes the rocket defy gravity and launch upward.
find the amount and the compound interest on rupees 10000 for 2 years at 5% per annum compounded annually
Compound interest:
[tex]a = p( 1 + \frac{r}{n} ) { }^{nt} [/tex]
a = final amount
p = principal amount
r = rate of interest
t = time
n = no. of compounding periods per year
p = 10000
r = 5% = 5/100 = 0.05
t = 2
n = 1
[tex]a = 10000(1 + \frac{0.05}{1} ) {}^{2 \times 1} [/tex]
[tex]a = 10000(1 + 0.05) {}^{2} [/tex]
[tex]a = 10000(1.05) {}^{2} [/tex]
[tex]a = 10000(1.1025)[/tex]
[tex]a = 11025[/tex]
What is the acceleration of the box?
Answer:
a=4,32m/s^2
Explanation:
Fnet = F1 - F2
= 12-1.2
= 10.8N
m=2.5kg
Fnet =ma
10.8=2.5a then divide both sides by 2.5 to get acceleration
How many seconds are there in a calendar year,given that a calendar year has 365.24 days in it?
Answer:
31556736
Explanation:
Since there are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365.24 days in a year, then you multiply all of those.
60*60*24*365.24 =
31556736
Which two factors affect the amount of force seen in objects?
Answer:thanks
Explanation:xixo
gv
A car accelerates from rest at a rate of 3 m/s² for 4 seconds. How far did the car travel?
PLEASE help fasttt
Answer:
24m
Explanation:
Given parameters:
Initial velocity = 0m/s
Acceleration = 3m/s²
Time = 4s
Unknown:
Distance covered = ?
Solution:
To solve this problem, we apply the right motion equation:
S = ut + [tex]\frac{1}{2}[/tex]at²
S is the distance
u is the initial velocity
t is the time taken
a is the acceleration;
S = (0 x 4) + [tex]\frac{1}{2}[/tex] x 3 x 4²
S = 24m
An object with mass 30 kg travelling as speed of 11 m/s receives an impulse of
240 kg m/s. What is the final velocity of the object?
Answer:
V₂ = 19 [m/s]
Explanation:
The final linear momentum will be equal to the sum of the initial momentum plus the momentum received. By means of the following equation, we can determine the final momentum.
[tex]m_{1}*v_{1} + IMP_{1-2} = m_{2}*v_{2}[/tex]
where:
m₁ = m₂ = mass = 30 [kg]
v₁ = velocity = 11 [m/s]
IMP₁-₂ = 240 [kg*m/s]
v₂ = final velocity [m/s]
[tex](30*11) + 240 = 30*V_{2}\\330 + 240 = 30*V_{2}\\v_{2}=19 [m/s][/tex]
The final velocity of the object is 19 m/s
The impulse is given by:
Impulse = m(v - u)
where m is the mass, v is the final velocity and u is the initial velocity.
Given that impulse = 240 kgm/s, u = 11 m/s, m = 30 kg. Hence:
Impulse = m(v - u)
240 = 30(v - 11)
8 = v - 11
v = 19 m/s
The final velocity of the object is 19 m/s
Find out more at: https://brainly.com/question/16980676
What are machines fueled by?
Group of answer choices
A. Gasoline only
B. Electricity only
C. Sun
D. Energy
why does deceleration lower force during a collision?
What is an earthquake
Answer:
When a underground suddenly breaks along a fault it cause vibration it is called earthquake.
in humans what makes the sound vibration vibrate
Answer:
sound vibration of spicker
A force of 85 N is used to push a box along the floor a distance of 15 m. How much work was done?
Answer:
1275J
Explanation:
Given parameters:
Force on box = 85N
Distance moved = 15m
Unknown:
Work done = ?
Solution:
Work done is the amount of force applied on a body to move it through a specific distance.
Work done = Force x distance
Now insert the parameters and solve;
Work done = 85 x 15 = 1275J
A cannon with a muzzle velocity of 500. meters per second fires a cannonball at an angle of 30.° above the horizontal. What is the vertical component of the cannonball's velocity as it leaves the cannon?
0.0 m/s
250. m/s
433 m/s
500. m/s
Complete question
A cannon with a muzzle velocity of 500. meters per second fires a cannonball at an angle of 30.° above the horizontal. What is the vertical component of the cannonball's velocity as it leaves the cannon?
A 0.0 m/s
B 250. m/s
C 433 m/s
D 500. m/s
Answer:
The correct option is C
Explanation:
From the question we are told that
The velocity is [tex]v = 500 \ m/s[/tex]
The angle is [tex]\theta = 30^o[/tex]
Generally the vertical component of the canon ball is mathematically represented as
[tex]v_y = v * cos (30 )[/tex]
=> [tex]v_y = 500 * cos (30 )[/tex]
=> [tex]v_y = 433 \ m/s[/tex]
Answer:
250. m/s
Explanation:
It is vertical component so you do: 500mSin(30°) = 250m/s
How are scientists able to predict when and where the next eclipse will occur?
Answer:
When the Earth and sun are perfectly lined up, then it will happen. They can tell when it's going to happen.
Explanation:
This is why it only happens in some places. Some days it's not sunny out, so it's not going to happen.
among 1 litre boiling water and red hot glowing nail which one has more amount of heat and why
Answer: The Water
Explanation:
The boiling litre of water has more volume and so has more heated molecules per cubic metre so it will have a higher amount of heat than the glowing nail.
To practically test this, put the glowing nail into a litre of cold water and record the final temperature when the nail has cooled down. Repeat this with the boiling litre of water. You will notice a higher final temperature with the boiling water indicating that it had more heat.
what happens to the particles in a substance during a physical change?
Answer:
In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy. ... Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. Only their arrangement, energy and movement changes.
Explanation:
this is true because if you think about it if you put a pill in a glass of water it dissolves its like particles
A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 100 N is being applied to the sled rope parallel to the ground, what is the force of friction between the sled and the snow?
Answer:
60.18 N
Explanation:
Given that:
The force applied on the sled = 100 N
Suppose, the angle between the sled rope and the ground = 53°
The horizontal force which acts in the horizontal direction can be expressed as:
[tex]F_x = F \ cos \theta[/tex]
[tex]F_x = 100 \ cos (53)[/tex]
[tex]F_x = 60.18 \ N[/tex]
But if the angle between the sled rope is parallel to the ground. Then, we use an angle on a straight line which is = 180°
[tex]F_x = F \ cos \theta[/tex]
[tex]F_x = 100 \ cos (180)[/tex]
= 100 × -1
= -100 N
2. For every action there is an equal and opposite reaction. Which Newton's law is defined?
Answer:
newtons 3rd law
Explanation:
newtons thirs law states for every action there is an equal and opposite reaction.
Answer:
Newton Third law states that for every action there is an equal and opposite reaction
A football player with a mass of 100 kg from runs from rest towards his opponent and hits him with a force of 500 Newtons 5 seconds later. What was his momentum before impact?
Answer:
2500kgm/s
Explanation:
Change in momentum is equal to impulse, numerically.
Ft=m( v-u)
But he begins from rest so u= 0
Then
Ft= mv
500(5)=mv
2500= mv
What is the modern periodic table of elements?
A. A chart organizing all elements by their atomic mass
B. A list of all elements occuring in nature
C. A chart organizing all elements by their atomic number
D. A list of all elements created by humans
calculate the height from from which a body is released from rest if its velocity just before hitting the ground is30m\s
Answer:
height = 45 m
Explanation:
Initial velocity = 0 m/s
Final velocity = 30 m/s
Acceleration due to gravity = +10m/s^2 ( because ball is going down )
Using the eqn of motion
[tex] {v}^{2} - {u}^{2} = 2gh[/tex]
where v= final velocity ; u = initial velocity ; g = acceleration due to gravity ; h = height
So,
[tex] {30}^{2} - {0}^{2} = 2 \times 10 \times h[/tex]
[tex] = > 20h = 900[/tex]
[tex] = > h = \frac{900}{20} = 45[/tex]
Canyon walls are eroded at a rate of approximately:
Group of answer choices
A half a centimeter per day.
B half a centimeter per year.
C one centimeter per day.
D one centimeter per year.
If the force is applied to a car, then its acceleration will ___________ because of Newton's _____________.