Answer: an element is a substance that cannot be broken down. it can’t be chemically decomposed into a different substance. elements are made up of just one atom
Explanation:
what are the two poles of a magnet
Answer:
The end that faces the north is called the north-seeking pole, or north pole, of the magnet. The other end is called the south pole. When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges.
Explanation:
Answer:
North pole, south pole
Explanation:
The end of the pole that faces the north is the north pole, and the other end is called the south pole.
Opposite poles attract (North-South), but like poles repel (South-South, North-South).
Correct displacement 4km south,2 km north, 5km south, and 5 km north
Answer:
2 km due south.
Explanation:
We need to find the displacement of 4km south,2 km north, 5km south, and 5 km north.
Let south is negative direction and north is positive direction.
The shortest path covered by an object is called its displacement.
D = -4+2-5+5
D = -2 km
So, the displacement is 2 km and it is in south direction.
A car traveling at 20 m/s runs into a bridge abutment and crumples for 1.2 m before coming to a full stop. If we estimate the process as constant deceleration motion, what is the average force exerted on the car, which weighs 1500 kg, during the collision process
Answer:
Average force exerted on car = 250,000 N or 250 KN
Explanation:
Given:
Initial speed u = 20 m/s
Final speed v = 0 m/s
Total distance covered = 1.2 m
Find:
Average force exerted on car
Computation:
v² = u² + 2as
0² = 20² + 2(a)(1.2)
a = -166.67 m/s² or 166.67 m/s²
Average force exerted on car = Ma
Average force exerted on car = (1,500)(166.67)
Average force exerted on car = 250,000 N or 250 KN
A 0.15 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a
constant force of -390 N. How long does it take this force to stop the ball?
Answer:
0.01 s
Explanation:
The following data were obtained from the question:
Mass (m) of baseball = 0.15 kg
Initial velocity (u) = +26 m/s
Final velocity (v) = 0 m/s
Force (F) applied = –390 N
Time (t) =?
Next, we shall determine the acceleration of the baseball. This can be obtained as follow:
Mass (m) of baseball = 0.15 kg
Force (F) applied = –390 N
Acceleration (a) of baseball =?
F = ma
–390 = 0.15 × a
Divide both side by 0.15
a = –390/0.15
a = –2600 m/s²
Finally, we shall determine the time taken for the baseball to stop. This can be obtained as follow:
Initial velocity (u) = +26 m/s
Final velocity (v) = 0 m/s
Acceleration (a) = –2600 m/s²
Time (t) =?
v = u + at
0 = 26 + (–2600 × t)
0 = 26 – 2600t
Collect like terms
0 – 26 = – 2600t
– 26 = – 2600t
Divide both side by – 2600
t = –26 / –2600
t = 0.01 s
Thus, it will take 0.01 s for the baseball to stop.
Answer:
0.01 s
Explanation:
The answer above is correct.
write the similarity between the inclined plane and a screw?
By dividing an uphill or downward movement into smaller increments, an inclined plane facilitates work.
An inclined plane wrapped around a cylinder is how a screw looks. It increases the forward driving power from a tiny rotational force.
What are a inclined plane and a screw?A basic device with a sloping surface called an inclined plane is used to lift heavy objects. When friction is taken into account, the force needed to move an object up an incline is less than the weight being raised. The needed force is closer to the real weight the higher the slope or incline.
A screw is a device that transforms rotational motion into linear motion and a torque's (a rotational force's) linear force into rotational motion. One of the six traditional simple machines, it. The most typical design consists of a cylindrical shaft with external threads, which are helical ridges or grooves.
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An object floats with half its volume beneath the surface of the water. The volume of the object is 3.5 m. What is the weight of the object? The density of water is 1000 kg/m3
Answer:
Since the object is floating, the buoyant force equals the weight of the water displaced:
W = d g v where d is the density of water and v = V/2 where v is the volume of the water displaced and v = V/2 where V is the volume of the object.
W = 1000 kg/m^3 * 9.8 m/s^2 * (3.5 /2 m^3)
W = 17150 kg m / s^2 = 17150 N
When an object floats with half its volume beneath the surface of the water. If the volume of the object is 3.5 m,then the weight of the object would be 17167.5 N if the density of water is 1000 kg/m3
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
The density is the reciprocal of the specific volume of any substance.
The mathematical formula for density is given below
ρ =m /V
where ρ is the density of the substance
m is the mass of the substance
V is the volume of the substance
As given in the problem an object floats with half its volume beneath the surface of the water. The volume of the object is 3.5 m
The density of water is 1000 kg/m3
According to the Archimedes principle, the buoyancy force acting on the floating object is equal to the weight of the fluid displaced by it
W = ρ g V
Given the object floats with half its volume beneath the surface of the water means the volume of the water displaced is half of the volume of the object
V=3.5/2 m³
W = 1000×9.81×3.5/2
= 17167.5 N
Thus, the weight of the object is 17167.5 N
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a wooden block has a mass of 562 g and a volume of 72 cm3. what is the density
Answer:
7[tex]\frac{29}{36}[/tex]g/cm³
Explanation:
The formula for density is [tex]\frac{mass}{volume}[/tex]. Let's apply the formula to the question:
[tex]\frac{562}{72}[/tex] = 7[tex]\frac{29}{36}[/tex]g/cm³
Friction marks are made by tools that indent a surface.
True or false
Answer:
false
Explanation:
(im sorry if im not right but im pretty sure that false is the answer)
What is the mass of an object that requires 45N to pull and accelerate at 0.5m/s2?
Answer:
t think 90
Explanation:
m=f/a
=45kg m/s/0.5m/s
450kg/5
90kg
When explaining chemical reactions to a friend, Brianna models a reaction by taking several colors of modeling clay and making a sculpture of a horse. Which type of chemical reaction is Brianna most likely explaining? synthesis decomposition polymerization replacement
Answer: synthesis
Explanation:
Chemical reaction which Brianna is explaining is synthesis reaction as she is making use of various colors to make a sculpture of horse .
What is chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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The total initial energy of a closed system is 1020 J. During an experiment, 500 J of this energy is converted into kinetic energy. What is the total final energy of this closed system?
A. 1520 J
B. 520 J
C. 500 J
D. 1020 J
Answer:
D. 1020 J
Explanation:
In a closed system the law of conservation of energy is prevalent.
According to the law of conservation of energy "energy is neither created nor destroyed but transformed from one form to another".
The starting and ending amount of energy must be the same. If the system starts with 1020J, then it must end with 1020J All the energy transformations will add up to 1020J for the final state.If the Sun, Earth, and Moon are lined up as shown above, then the Earth would have...
Neap tide, in which there are almost no tides
Spring tides, in which there is almost no tides
Spring Tides, in which the high tides are extremely high and the low tides are extremely low
Neap tides, in which there are very high and very low tides
Answer: Left cheek from the sun
Explanation:
If the resistance in the coil is 2.0 , what is the magnitude of the induced current in the coil while the field is changing
This question is incomplete, the complete question is;
A coil consists of 200 turns of wire. Each turn is a square of side 18 cm, and a uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.50 T in 0.80 s,
a) what is the magnitude of the induced emf in the coil while the field is changing?
b) if the resistance of the coil is 2.0, what is the magnitude of the induced current in the coil while the field is changing?
Answer:
a) the magnitude of the induced emf in the coil is 4.05 V
b) induced current in the coil I is 2.025 A
Explanation:
Given that;
side of turn a = 18 cm = 0.18 m
no. of turns N = 200
dB = 0.50 T
time t = 0.80 sec
(a)
what is the magnitude of the induced emf in the coil while the field is changing?
we know that the magnetic flux is equal to the product of the magnetic field in a loop and the area of the loop so;
∅ = NBA
expression for the electromotive force is expressed as;
∈ = d∅/dt
Now replace NBA for ∅ in the above equation.
∈ = d(NBA) / dt
= NA(dB/dt)
The expression for the area of each square turn is expressed as follows
A = a²
a is the side of the turn
so we substitute the value of a
A = (0.18) ²
A= 0.0324 m²
As earlier derived
formula for the electromotive force is as follows:
∈ = NA(dB/dt)
so we substitute all our values
∈ = (200)(0.0324m²) (0.50T/0.80s)
∈ = 6.48 × 0.625
∈ = 4.05 V
Therefore the magnitude of the induced emf in the coil is 4.05 V
(b)
if the resistance of the coil is 2.0, what is the magnitude of the induced current in the coil while the field is changing?
we know that the current induced in the circuit is equal to the ratio between the electromotive forces to the resistance of the ring so;
I = ∈ / R
given that; resistance of the coil = 2.0
so we substitute
I = 4.05 / 2.0
I = 2.025 A
Therefore induced current in the coil I is 2.025 A
Three equal point charges, each with charge 1.45 μC , are placed at the vertices of an equilateral triangle whose sides are of length 0.450 m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)
Answer:
0.126J
Explanation:
To calculate the potential energy of the system U:
Since the charges are the same, and the charges between them are the same.
q1 =q2 = q3 are the charges, and r1=r2=r3 is the distance between their centres.
q = 1.45 μC
r = 0.450 m
1/4πE°(3q^2/r)......... 1
1/4πE° = 9 × 10^9 N⋅m^2⋅C−2,
Substitute the values into equation 1
= 9 × 10^9 N⋅m^2⋅C−2 × {3* (1.45×10^-6)^2/0.450m}
= 9 × 10^9 N⋅m^2⋅C−2×{3*2.1025^-12/0.450m}
= 9 × 10^9 N⋅m^2⋅C^−2×{6.3075^-12}/0.450m
= 9 × 10^9 N⋅m^2⋅C^−2 × 1.401^-11
= 0.12615J
= 0.126J
Disregarding air friction, what force(s) act on a bullet shot from a rifle as it moves through the air?
a) gravity
b) spinning force from the rifle
c) force from the gunpowder
d) none of the above
Answer:
♡ goodmorning ♡
the answer is a.
hope this could help! ☆
- madeline/madi
✧･ﾟ: *✧･ﾟ:･ﾟ✧*:･ﾟ✧･ﾟ
Explanation:
The mass of an object is 60kg on the surface of the earth what will be its weight on the surface of the moon
Take g as 10m/s2
Answer:
Wm = 97.2 [N]
Explanation:
We must make it clear that mass and weight are two different terms, the mass is always preserved that is to say this will never vary regardless of the location of the object. While weight is defined as the product of mass by gravitational acceleration.
W = m*g
where:
m = mass = 60 [kg]
g = gravity acceleration = 10 [m/s²]
But in order to calculate the weight of the body on the moon, we must know the gravitational acceleration of the moon. Performing a search of this value on the internet, we find that the moon's gravity is.
gm = 1.62 [m/s²]
Wm = 60*1.62
Wm = 97.2 [N]
Eugene is 75.0 km due south of Salem. If joe rides from Salem to Eugene on his bike in 6.00 h, what is his average velocity?
Answer:
12.5 km/h
Explanation:
For this question, you just need to use the equation x/t = v. X is distance, T is time, and V is velocity. If you need to as well, you could convert km to m and h to s to make it into m/s.
what is nuclear force
5. A 2-Me V neutron traveling in water has a head-on collision with an 160 nucleus. (a) What are the energies of the neutron and nucleus after the collision
Answer:
- Final energy of neutron is 1.557 Mev
- Final energy of nucleus is 0.443 Mev
Explanation:
Given the that;
for ¹⁶O, A = 16
we know that Energy of neutron and nucleus after collision = ( A - 1 / A + 1)² E₀
so we substitute
Fe = ( 16 - 1 / 16 + 1)² × 2
= (0.8823)² × 2
= 1.557 Mev
therefore Final energy of neutron is 1.557 Mev
Final energy of nucleus will be
2 - Final energy of neutron
= 2 - 1.5569
= 0.443 Mev
therefore Final energy of nucleus is 0.443 Mev
the modern united kingdom and france, by virtue of most, government power being held by the central, national government, are best described as having which form of government?
Answer:
Explanation:
The modern United Kingdom and France, by virtue of most government power being held by the central, national government,
Answer:
The answer Iswhat the other person said
Explanation:
What kind of energy do electric and magnetic fields contain?
A
thermal energy
B
electrical energy
C
kinetic energy
D
pot
Answer:
Electromagnetic waves
Electromagnetic waves bring energy into a system by virtue of their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave itself, whether it is absorbed or not.
So the answer is B electrical energy
Thank you and please rate me as brainliest as it will help me to level up
Help please I’ll mark as brainliest
Answer:
yes
Explanation:
go to his profile and roast the mess out of him plzz 403665fl 50 points
Answer:
ok
Explanation:
BRAINLIEST, PLEASE pls pls pls pls pls pls pls pls pls pls pls plsl plsssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Answer:
A. 1.
B. 5.
C. 3.
D. 4.
E. 6.
F. 4.
Explanation:
how do u forensically establish car movements ?
Answer:
i think issa uh.. i think issa carrot
Explanation:
6. The momentum of a 30.0 g bird with a speed of 12 m.s-1 is 0.36 kg.m.s-1. What will be its momentum 12s later if a constant .02 N force due to air resistance acts on it
Answer:
Explanation:
initial momentum = .36 kg.m.s⁻¹
negative impulse = force x time = .02 x 12 = .24 kg.m.s⁻¹
final momentum - initial momentum = impulse
final momentum = initial momentum + impulse
= .36 - .24
= .12 kg.m.s⁻¹
A motobike's tire rotates with a constant angular speed of 62.8 rad/s. The radius of a tire is 30cm. Assuming that no slipping occurs, the linear speed at a
point 20 cm from the tire's center is:
Chọn một:
a.
10 m/s
b.
20 m/s
C.
18.8 m/s
d.
12.6 m/s
Answer:
12.6 m/s
Explanation:
We know that the linear speed v = rω where r = radius and ω = angular acceleration. Given that ω = 62.8 rad/s and r = 20 cm from center = 0.2 cm
So, v = rω
= 0.2 m × 62.8 rad/s
= 12.56 m/s
≅12.6 m/s
if the image
Formed by alens in
always diminished!
and erect. What
nature o
F the lens
Answer:
The lens is a concave lens
Explanation:
In concave lens, the image formed is erect. diminished and virtual. The more the distance of the object from the mirror, the more diminished the image formed will be. Concave lens are used in binoculars and telescopes and are installed before or in the eye piece to enable a clear focus.
A block moving at an initial velocity of 18 m/s accelerates at
a rate of -9m/s2. What is the velocity of the block after 6
seconds?
Answer:
-36 m/s
Explanation:
u = 18m/s
a = -9m/s²
v = ?
t = 6s
from,
v = u + at
v = 18 + (-9)(6)
v = 18 - 54
v = -36m/s
After initially picking the stone up off the ground, a man exerts a 148 N force upwards on a 10 kg stone. What is the acceleration of the stone?
Answer:
5m/s²
Explanation:
The force exerted on an object is calculated using the formula ;
F = ma
Note that the upward force (F) is 148N
Where;
F = force (N)
m = mass (kg)
a = acceleration (m/s²)
The downward force towards gravity is F' = mg
F' = 10 × 9.8m/s²
F' = 98N
Net force (F - F') = m × a
148 - 98 = 10 × a
50 = 10a
a = 50/10
a = 5m/s²