Answer:
its A. because since heat energy means thermal i think it is A and also When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.
Explanation: your welcome and i hope its right
A trainer is training a horse for the Kentucky Derby. The trainer knows the horse needs to have an opening acceleration of 10 m/s^2. If the horse has a mass of 450 kilograms, how much force will the horse need to produce to reach the needed acceleration?
2500 N
4500 N
3500 N
3000 N
Answer:
4500 N
Explanation:
Acceleration = 10 m/s²
Mass = 450 kilograms
Force = ?
[tex]force \: = mass \times acceleration \: \\ force \: = 450 \times 10 \\ force = 450[/tex]
Force = 450 Newton
A car accelerates from 6.0 m/s to 18 m/s at a rate of 3.0 m/s^2. How far does it travel while accelerating?
A. 82m
B. 29m
C. 48m
D. 144m
Answer:
48
Explanation:
we know that
v^2=u^2+2as
18^2=6^2+2*3s
324=36+6s
6s=324-36
6s=288
s=48
plz markbas brainalist
What is the momentum of a baseball with a mass of 4 kg being thrown at a velocity of 84 m/s towards the hitter
Answer:
The answer is 336 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocityFrom the question
mass = 4 kg
velocity = 84 m/s
We have
momentum = 4 × 84
We have the final answer as
336 kgm/sHope this helps you
who makes the first atomic bomb?
Answer:
Robert Oppenheimer made the first atomic bomb.
What is the magnitude of the gravitational force acting on the car?
A) 14700N
B)13690N
C)5800N
D)775N
The magnitude of the gravitational force acting on the car is 14700 N.
What is gravitational force?In mechanics, gravity, often known as gravitation, is the force of attraction that acts on all matter. It has little impact on determining the intrinsic characteristics of common stuff because it is by far the weakest known force in nature.
In contrast, it governs the formations and evolution of stars, galaxies, and the entire cosmos by its extensive and ubiquitous action, which affects the trajectories of objects in the solar system and beyond the universe.
In this free body diagram: 14700 N force acting downwards due to its weight. Hence, it is the magnitude of the gravitational force acting on the car.
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A5 kg football is launched 45 degrees above the horizontal at a speed of 26 m/s.
What is the time of flight for the football from the point it left the ground until it hit the ground?
A ball is thrown straight upward and returns to the thrower's hand after 3 seconds in the air. A second ball is thrown at an angle of 30 degrees with the horizontal. At what speed (remember that this is the resultant magnitude of the vertical and horizontal speeds) must the second ball be thrown so that it reaches the same height as the one thrown vertically?
Explanation:
Given that the first ball is thrown vertically and upward.
since it reaches the throwers hand after 3 seconds, then the time taken to reach maximum height is
= T/2
=3/2
=1.5 seconds
Also, the projection angle for the second ball is 30°
we know that at maximum height vertical velocity is 0
therefore the final velocity of the first ball is
Vy= 0
Also, since the first ball is thrown upward the horizontal velocity is 0
Vx=0
from the first law of motion
Vy=u+at
Vy=0, a= -g
Uy=gt
Uy=9.81*1.5
Uy=14.7m/s
since both reach the same height, they will have the same vertical velocity
Uy= Vo sin∅
Vo=Uy/sin∅
Vo= 14.7/sin 30
Vo=29.4m/s
1.)what is the acceleration of a ball with a mass of 0.40 kg is hit with a force of 16N
Answer:
a = 40 [m/s^2]
Explanation:
This problem can be solved using Newton's second law which tells us that the sum of forces acting on a body must be equal to the product of mass by acceleration.
F = m*a
where:
m = mass = 0.4 [kg]
F = force = 16 [N]
a = acceleration [m/s^2]
Now replacing we have:
16 = 0.4*a
a = 40 [m/s^2]
difference between
Atmospheric pressure and Liquid pressure.
Answer:
one is Atmospheric and one is a Liquid
Explanation:
A tennis ball is dropped from 1.77 m above
the ground. It rebounds to a height of 1.05 m.
With what velocity does it hit the ground?
The acceleration of gravity is 9.8 m/s2. (Let
down be negative.)
Answer in units of m/s.
Answer:
5.89 m/s
Explanation:
Given:
Δy = 1.77 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) (1.77 m)
v = 5.89 m/s
12. A train is traveling away from you at a constant speed.
What would a distance-time graph look like for this train?
Answer:
b
Explanation:because think about it its going straight so you have to coiunt the miles the train is going and boom your answer is b
Answer:
It would be choice b
Explanation:
speed is constant so they value won't change, on the other hand time is always going.
if Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?
Answer:
10g
Explanation:
As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".
Though melting of tin isn't a chemical change, the same logic is applied here...
Hence,
The mass of tin will be 10 g itself...
Answer:
10g
Explanation:
The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.
Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.
The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.
Therefore, we are left with about the same mass of substance we started with which is 10g.
Which has more momentum, a 2.0 kg dog at 41 m/s or a 75 kg pony at 1.0 m/s?
Answer:
The dog has more momentum than the pony.
Explanation:
To solve this problem, we must remember the formula for calculating momentum, which is given below:
momentum = p = m*v
where m represents the mass of the object and v represents the velocity of the object
Using this knowledge, let's calculate the momentum for the dog and the pony.
Dog: p = m*v = (2kg)*(41 m/s) = 82 kg*m/s
Pony: p = m*v = (75kg)*(1 m/s) = 75 kg*m/s
Since 82 > 75, we can conclude that the dog has more momentum.
Hope this helps!
A boy starts jogging with a speed of 4.0 m/s and
reaches a speed of 5.0 m/s after covering a distance
of 9 m. What is the boy's acceleration?
Answer:
acceleration=0.111 m/s²
Explanation:
acceleration = change in velocity/time taken
1/9=0.1111
acceleration=0.111 m/s²
what is the properties of polarization
Answer:
Explanation:
The polarization characteristics depend on the shape, size, and optical properties of the surface particles. Generally, the radiation is linearly polarized and is said to be negatively polarized if it lies in the scattering plane and positively polarized if it is perpendicular to the scattering plane.
Two hockey pucks, each with a mass of 0.2 kg, slide across the ice and
collide. Before the collision, puck 1 is moving 16 m/s to the east and puck 2 is
moving 11 m/s to the west. After the collision, puck 1 is moving at 11 m/s to
the west. What is the velocity of puck 2?
A. 16 m/s west
B. 16 m/s east
C. 11 m/s east
D. 11 m/s west
HELPPP PLEASE I HAVE NO IDEA HOW TO DO THIS
Puck 1 after collision with Puck 2 moves towards the west with a speed of 11 m/s, so Puck 2 will move towards the east with a speed of 16 m/s. Hence, option B is correct.
What is collision?A collision, also known as an impact, occurs when two entities, such as two pool pieces, a country club, and a ball, a mallet and a nail, two rail cars when joined, or a tumbling object and a floor, suddenly and violently collide in close proximity to one another. The consequence of the impact is affected by the force, the length of time the items are in contact, the materials the two objects are made of, and other factors. According to conventional knowledge, a high-strength steel ball will rebound almost to the same spot from which it was dropped, in contrast to a mud or lead ball.
All of the kinetic energy of the colliding bodies is lost in a fully elastic impact, while the loss of kinetic energy is greatest in a perfectly plastic impact.
Therefore, the velocity of Puck 2 is 16 m/s towards the east direction.
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4. An object is thrown vertically upward with a speed of 25 m/s. How much time passes before it
comes back down at 15 m/s? (Air resistance is negligible.)
a. 1.0 S
d. 18 s
b. 4.1 s
e. 27 s
c. 9.85
Can you also explain how you got the answer please?
Answer:
Option b is correct: 4.1 s
Explanation:
Vertical Launch
An object launched thrown vertically upward where air resistance is negligible, reaches its maximum height in a time t, given by the equation:
[tex]\displaystyle t=\frac{v_o}{g}\qquad\qquad[1][/tex]
Where vo is the initial speed and g is the acceleration of gravity g=9.8 [tex]m/s^2[/tex].
Once the object reaches that point, it starts a free-fall motion, whose speed is (downward) given by:
[tex]v_f=g.t\qquad\qquad[2][/tex]
The object considered in the question is thrown with vo=25 m/s. The time taken to reach the maximum height is given by [1]:
[tex]\displaystyle t=\frac{25}{9.8}=2.551\ sec[/tex]
The object starts its falling motion and at some time, it has a speed of vf=15 m/s. Let's find the time by solving [2] for t:
[tex]\displaystyle t=\frac{15}{9.8}=1.531\ sec[/tex]
The total time taken by the object to go up and down is
[tex]t_t=2.551\ s+1.531\ s=4.081\ s[/tex]
a. This option is incorrect because it's far away from the answer.
d. This option is incorrect because it's far away from the answer.
b. This option is correct because it's a good approximation to the calculated answer.
e. This option is incorrect because it's far away from the answer.
c. This option is incorrect because it's far away from the answer.
Silvia rides her bike 2.7km to school. After school, she rides an additional 1.3 km to the mall in the opposite direction. What is her total distance traveled?
Answer:
4.0 km
Explanation:
Total distance traveled doesn't care about direction:
Total distance traveled = 2.7km + 1.3 km = 4.0 km
what is the weight of a rock with a mass of 3.6 kilograms
The weight of a rock with a mass of 3.6 kilograms will be 35.3 N. The weight of matter is found as the product of the mass and the gravitational acceleration.
What is mass?Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.
In the International System of Units (SI), the kilogram is the unit of mass.
The given data in the problem is;
The weight of a rock is,[tex]\rm W[/tex]
The mass of rock is,[tex]\rm m= 3.6 \ kilograms[/tex]
The weight of matter is found as the product of the mass and the gravitational acceleration;
[tex]\rm W= mg \\\\ \rm W= 3.6 \times 9.81 \\\\ W=35.3 \ N[/tex]
Hence, the weight of a rock will be 35.3 N.
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PLEASE HURRY AND HELP
What is the correct unit for acceleration?
A. m
B. m/s
C. m/s2
The temperature of a sample of iron with a mass of 10.0 g changed
from 50.4°C to 25.0°C with the release of 114.3 J of heat. What is the
specific heat of iron
Answer:
Q = mc(θ₂-θ₁)
47 calories = 10 g *c*(50.4 - 25)
47cal = 10*c* 25.4
47 /(10*25.4) = c
0.185 = c
Specific heat of iron = 0.185 cal/g°C
Explanation:
1. How far away will a ball land when thrown from a hill 70 m high at a 45 angle from the horizontal at an initial velocity of 9 m/s?
2. How long will it take for the ball in problem 1 to fall to the ground? Remember the pull of gravity is (-9.8 m/s)
3. What is the maximum height reached by the object?
Answer:
[tex]28.53\ \text{m}[/tex]
[tex]4.48\ \text{s}[/tex]
[tex]72.1\ \text{m}[/tex]
Explanation:
[tex]y_0[/tex] = Height from where the ball is thrown = [tex]70\ \text{m}[/tex]
[tex]\theta[/tex] = Angle of inclination = [tex]45^{\circ}[/tex]
[tex]u[/tex] = Initial velocity = [tex]9\ \text{m/s}[/tex]
[tex]g[/tex] = Acceleration due to gravity = [tex]9.8\ \text{m/s}^2[/tex]
Range of projectile is given by
[tex]R=\dfrac{u\cos \theta }{g}\left(u\sin \theta +{\sqrt{u^{2}\sin ^{2}\theta +2gy_{0}}}\right)\\\Rightarrow R=\dfrac{9\cos45^{\circ}}{9.8}\left(9\sin45^{\circ}+\sqrt{9^2\left(\sin45^{\circ}\right)^2+2\times 9.8\times 70}\right)\\\Rightarrow R=28.53\ \text{m}[/tex]
The ball will land [tex]28.53\ \text{m}[/tex] away.
Time of flight is given by
[tex]t=\dfrac{u\sin \theta +{\sqrt{(u\sin \theta )^{2}+2gy_{0}}}}{g}\\\Rightarrow t=\dfrac{9\sin 45^{\circ} +{\sqrt{(9\sin 45^{\circ} )^{2}+2\times 9.8\times 70}}}{9.8}\\\Rightarrow t=4.48\ \text{s}[/tex]
The time the ball will stay in the air is [tex]4.48\ \text{s}[/tex]
Maximum height is given by
[tex]h=y_0+\dfrac{u^2\sin^2\theta}{2g}\\\Rightarrow h=70+\dfrac{9^2\times \sin^245^{\circ}}{2\times 9.8}\\\Rightarrow h=72.1\ \text{m}[/tex]
Maximum height the object will reach above the ground is [tex]72.1\ \text{m}[/tex].
For objects in free-fall, what is the relationship between an object's mass and its acceleration
Answer:
the objects mass is independent of its acceleration in free fall
The acceleration of the object equals the gravitational acceleration. The mass, size, and shape of the object are not a factor in describing the motion of the object. So all objects, regardless of size or shape or weight, free fall with the same acceleration.
Which statement best explains acceleration?
A.
It is the total distance covered over a period of time.
B.
It is a change in velocity over a period of time.
C.
It is a change in displacement over a period of time.
D.
It is a change in direction over a period of time.
Answer:
B
Explanation:
Answer:
It is a change in velocity over a period of time.
Explanation:
During an ,
experiment, a siginal from a spaceship
reached the ground station in five minutes. What was the
distance of
the spaceship from
the ground station? The
signal travels at the speed of light, that is 3x 109 ms‐1
Answer:
1.5*10^9
Explanation:
distance =V x T
=3x10^8x5
=1.5*10^9
CORRECT ANSWER GETS BRANLIEST PLZ HELP
1. What is the velocity of a car that traveled a total of 85 km South in 5 hours?
2. A plane traveled 3000 miles from New York to Los Angeles in 5 hours. What is the plane’s
velocity?
Answer:
I think 1. is 17 and 2. is 600
Explanation:
sorry its been a while..
PLEASE HELP AND HURRY
At what point will the vertical component of the balls velocity be the smallest?
A. point x
B. point y
C. point z
D. not enough information
Answer:
I believe your answer would be B. point y
please help me with this question asap
HEY CAN ANYONE ANSWER DIS RQ PLS!!!!
Answer:
scale and balance
Explanation:
Answer:
scale and balance
please follow me
which part of the central nervous system controls reflexes?
a. cerebrum
b. cerebellum
c. brain
d. spinal cord
Answer:
spinal cord becuse it does all of the reflexes
Answer:
none of these
Explanation:
what actually controlls reflexes is the brain stem
