Answer:
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.
What term or phrase describes a point that appears to stay in place and can be used to detect the motion of an object?
Answer:
reference point
Explanation:
you can use a reference point to tell when an object is in motion or staying still. :)
A car is travelling along the road where the speed limit is 30 mph. A speed detector measures it speed as 15 m/s. Use this fact to work out whether or not the car is breaking the speed limit: there are 1609 m in a mile
Answer:
The speed of the car is in from as the required speed limit on the road.
Explanation:
The speed limit on the road is 30 miles per hour.
Given that: 1 mile = 1609 m
Also,
60 second = 1 minutes
60 minutes = 1 hour
Then,
30 miles per hour = [tex]\frac{30 *1609}{60*60}[/tex]
= [tex]\frac{48270}{3600}[/tex]
= 13.4083
30 miles per hour = 13.41 m/s
The speed measured by the detector is 15 m/s which is not accurate. Therefore, the car was moving at the required speed limit. The speed of the car is lesser than that measured by the detector. Thus no offence has been committed by the driver.
Net force is the sum of all forces acting on an object. For example, in a tug of war, when one team is pulling the rope with a force of 100 N and the other with 80 N, the net force would be 20 N at the direction of the first team (10
Answer:
20N toward the first team.
Explanation:
The net force is the resultant force that replaces the summation of the individual forces acting on a body.
Now in the game of a tug of war, let the summation of forces to the right be positive and the summation of forces to the left be negative
forces.
hence the summation of positive and negative forces must equal zero
that is,
100-80=0
20=0
Hence the resultant or the net force is 20N, and the direction tends towards the direction of the larger force which is to the right of the first team.
A supply plane drops a package to the ground for stranded campers below. After falling for 8.14 seconds, the package will have a downward velocity of 80.79 m/s. How high was the plane when it dropped the package?
Answer:
333 m
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 0 m/s.
Time (t) = 8.14 s.
Final velocity (v) = 80.79 m/s.
Acceleration due to gravity (g) = 9.8 m/s²
Height (h) =?
v² = u² + 2gh
80.79² = 0 + (2 × 9.8 × h)
6527.0241 = 0 + 19.6h
6527.0241 = 19.6h
Divide both side by 19.6
h = 6527.0241 / 19.6
h = 333 m
Thus, the plane was at a height of 333 m when the package was dropped.
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a snooker ball travels 4 meters, diagonally across the table it travels at a speed of 5m/s. calculate how long the ball is travelling for
Answer:
4 secs
Explanation:
I am right trust me
where does reduction occur in an electrolytic cell
a. cathode
b. salt bridge
c. anode
d. wire
Answer:
The answer is actually a. Cathode
Explanation:
Just took the quiz
In an electrolytic cell, the reduction occurs at the cathode. So, the correct option is a.
What is meant by reduction ?Reduction is defined as the process through which a reactant gain electrons during a chemical reaction.
Here,
An electrolytic cell is an equipment that uses electric current to drive a redox reaction.
Redox reactions are the type of reaction that involves the transfer of electrons between the reactants. That means, in redox reactions, both oxidation and reduction occurs. The reactant that gains the electrons is said to be reduced and the one that losses the electrons is said to be oxidized.
In an electrolytic cell, cathode is the positively charged electrode. So, electrons are attracted towards it, and as a result, the cathode gets reduced.
Hence,
In an electrolytic cell, the reduction occurs at the cathode.
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A volcanic eruption launches two rocks of different masses into the air. The first rock had a mass of 10 kilograms while the second rock had a mass of 20 kilograms.
At the eruption, both rocks accelerated at a rate of 600 m/s2. Which of the following statements is true regarding the eruption of the two rocks?
The amount of force applied to rock one was twice as much as the force applied to rock two during the eruption.
The amount of force applied to rock one was the same as the force applied to rock two during the eruption.
The amount of force applied to rock one was half the amount of force applied to rock two during the eruption.
The amount of force applied to the rocks is impossible to determine without knowing the inertia of the rocks.
Answer:
C. The amount of force applied to rock one was half the amount of force applied to rock two during the eruption.
Explanation:
A force is an agent which changes the state of an object well applied to it. Second Newton's law of motion state's that;
F = ma
where F is the force, m is the mass of the object and a is the acceleration of the object.
In the given question,
Mass of first rock = 10 kilograms
Mass of the second rock = 20 kilograms
Acceleration of the two rocks = 600 m/[tex]s^{2}[/tex]
Thus,
Force on the first rock = ma
= 10 x 600
= 6000 N
Force on the second rock = 20 x 600
= 12000 N
Therefore, it can be observed that the amount of force applied to rock one was half the amount of force applied to rock two during the eruption.
The statement that is true regarding the eruptions of the two rocks is;
Option C; The amount of force applied to rock one was half the amount of force applied to rock two during the eruption.
We are given;
Mass of first rock; m1 = 10 kg
Mass of second rock; m2 = 20 kg
Acceleration of both rocks; a = 600 m/s²
The formula for Force applied is;
F = ma
Where;
m is mass
a is acceleration
Now;
Force applied on first rock; F1 = m1 × a
F1 = 10 × 600
F1 = 6000 N
Force applied on second rock; F2 = m2 × a
F2 = 20 × 600
F2 = 12000 N
We can see that the force applied to rock 1 was half the amount of force applied to rock 2.
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If a refrigerator draws about 0.5 amps when plugged into a 120 V wall outlet how much power (watts) does it use?
Answer:60 W
Explanation:
NEED HELP NOW 75 POINTSSSS
In Harry Bahrick’s study, he found participants to be really good at recognizing the __________ of old high school classmates.
A.
homes
B.
ages
C.
faces
D.
names
Answer:
faces
Explanation:
Answer:
C.FACESExplanation:
E20 GOT A HUNDRED PERCENT6. A car drives 750 miles in 10 hours. Calculate the speed of the truck
.
Answer:
75 miles an hour
I hope this is correct and helps
If you add an additional neutron to an atomwhat do you create?
Answer:
However, if you add a thousand neutrons, you will be creating one super-radioactive atom. Neutrons play a major role in the mass and radioactive properties of atoms. You may have read the page on isotopes. Isotopes are created when you change the normal number of neutrons in an atom.
Explanation:
The neutron is a subatomic particle, symbol n or n⁰, which has a neutral (not positive or negative) charge and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Their properties and interactions are described by nuclear physics.
If you are sitting in a bus that is traveling along a straight, level road at 100 km/hr., you are traveling at 100 km/hr too. (a) If you hold an apple over your head, how fast is it moving relative to the road? (b) Relative to you? (c) If you drop the apple, does it still have the same horizontal motion? Explain.
What Law is it?
(a) The velocity of the apple with respect to the road is 100 km/h.
(b) The velocity of the apple with respect to you is 0 km/h.
(c) If you drop the apple the horizontal velocity will not change due to law of conservation of linear momentum.
What is the relative velocity of the apple?
The relative velocity of the apple placed over your with respect to the road is calculated as follows;
Velocity of the apple = 100 km/h
Velocity of the road = 0 km/h
Va/r = 100 km/h - 0 km/h
Va/r = 100 km/h
The velocity of the apple relative to you is calculated as follows;
your velocity = 100 km/h
velocity of the apple = 100 km/h
Va/y = 100 km/h - 100 km/h
va/y = 0 km/h
If you drop the apple, the horizontal velocity will remain the same, because gravity does not affect horizontal motion.
The law is law of conservation of linear momentum.
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7. A 1000-kg car comes to a stop without skidding. The car's brakes do 50,000 J of work
to stop the car. Which of the following was the car's velocity when the brakes were
initially applied?
Answer:
10 m/s
Explanation:
Which of the following is an example of rotation?
O A. The Moon traveling around Earth
O B. A car driving around a racetrack
O C. Earth traveling around the Sun
O D. An ice skater spinning in place
What is Mass definition for physics
Answer:
Scientific Definition of Mass Mass is the quantity of inertia (resistance to acceleration) possessed by an object or the proportion between force and acceleration referred to in Newton's Second Law of Motion (force equals mass times acceleration).
Explanation:
Again, Same Thing!
And Another Wendys Roast
Which of the following is NOT a characteristic of members of the plant kingdom?
A.Specialized tissues for water absorption
B. Cells are eukaryotic
C. Perform photosynthesis to produce glucose
D. Cell wall made of cellulose
Answer:
A. i think
Explanation:
1.) What is the process called when a liquid changes to a
gas below the boiling point?
2.) What phase of matter maintains its shape when a
force is applied?
ASAP???? 16 points need help ?????
Answer:
1.)Evaporation, 2.) solid
Explanation:
hope this helps can i get brainliest
how longitudinal waves are formed
Answer:
forever
Explanation:
You are trying to climb a castle wall so, from the ground, you throw a hook with a rope attached to it at 24.1 m/s at an angle of 65.0° above the horizontal. If it hits the top of the wall at a speed of 16.3 m/s, how high is the wall?
Answer:
The value is [tex]h = 13.2 \ m[/tex]
Explanation:
From the question we are told that
The speed of the rope with hook is [tex]u = 24 .1 \ m/s[/tex]
The angle is [tex]\theta = 65.0^o[/tex]
The speed at which it hits top of the wall is [tex]v = 16.3 m/s[/tex]
Generally from kinematic equation we have that
[tex]v_y^2 = u_y ^2 + * 2 (-g)* h[/tex]
Here h is the height of the wall so
[tex][16.3 sin (65)]^2 = [24.1 sin (65)] ^2+ 2 (-9.8)* h[/tex]
=> [tex]h = 13.2 \ m[/tex]
what is the two kinds of solids in amorphous
Solids can be classified into two types: crystalline and amorphous. Crystalline solids are the most common type of solid. They are characterized by a regular crystalline organization of atoms that confer a long-range order. Amorphous, or non-crystalline, solids lack this long-range order.
Since friction is a force,
what unit is friction
measured In???
Answer:
Since friction is a force it is measured in newtons
Hope this helps
A Car accelerates from 4 m/s to 16 m/s in 4 seconds. What is the car's
acceleration?
O 12 m/s^2
3 m/s^2
4 m/s^2
O 1 m/s^2
Answer:
4 m/s^2
that is the right acceleretion a car
Answer:
I believe that the answer is 3 m/s^2
Explanation:
since acceleration is final velocity minus initial velocity divided by time, we can plug in known values and solve.
a=(f-i)/t
a=(16-4)/4
a=12/4
a=3
3m/s^2 is the acceleration
HELP ASAP !
Which of the following situations would result in no work done by the force indicated?
a
The object undergoes only a slight displacement while the force is acting on it.
b
The force is perpendicular to the displacement of the object.
c
The force is not completely parallel to the displacement of the object
d
All of the above result in no work done by the force indicated.
Answer:
b The force is perpendicular to the displacement of the object.
Explanation:
Work is done when a force is applied on a body causing it to move in a particular direction.
Work done = Force x displacement
For work to be done, a force must applied on a body to move it through a specific distance in direction.
When force is perpendicular to the displacement of the object, the component vector resolution is 0 and the work done is 0.
Which of the following is a resistor?
fan
switch
battery
Thank you!
A 50 kg object is accelerating to the right at 5 m/s2. What is the net force acting on the object?
Answer:
250 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 50 × 5
We have the final answer as
250 NHope this helps you
What is pitch?
O A measure of the speed of sound
O The highness or lowness of sound
O A characteristic of light
Answer:
The second one
Answer:
The highness or lowness of sound
Explanation:
A 10kg ball has a momentum of 40 kg.m/s. What is the ball’s speed.
Show the work and equations.
Answer:
4 m/sExplanation:
The speed of the ball can be found by using the formula
[tex]s= \frac{p}{m} \\ [/tex]
p is the momentum
m is the mass
From the question we have
[tex]v = \frac{40}{10} = 4 \\ [/tex]
We have the final answer as
4 m/sHope this helps you
Electric current passing through a wire produces _.
a
a magnetic field around the wire
b
a compass
c
geographic poles
d
a permanent magnet
Answer: Answer is A.
A magnetic field around the wire
Explanation:
Which circuit hook-up design will have the brightest light bulb?A - 1 battery 1 bulb, B - 2 batteries 1 bulb, C - 3 batteries one bulb, D 2 batteries the bulb is on the other end, E 1 battery and 1 bulb on the other end Question 5 options: A B C D E
Answer:
C. 3 batteries one bulb
Explanation:
Assuming batteries have the same voltage and current rating, the more power available, the more power the bulb can draw from the battery since the power in a battery-powered circuit is proportional to the number of batteries used. So, the circuit with three batteries would produce the brightest light bulb.
