An atomic nucleus is composed of
Answer:
84 protons and 128 neutron
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.
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
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
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.
Learn more about inclined plane here:
https://brainly.com/question/14983337
#SPJ2
what is the acceleration of a 5kg object pushed by 50 n
Answer:
i think it is 10m/s^2
force divide by mass
An object has a kinetic energy Ek. What happens to the kinetic energy if we:
(a) double m?
(b) triple v?
If each of the three rotor helicopter blades is 3.50 m long and has a mass of 120 kg , calculate the moment of inertia of the three rotor blades about the axis of rotation.
Answer:
1470kgm²
Explanation:
The formula for expressing the moment of inertial is expressed as;
I = 1/3mr²
m is the mass of the body
r is the radius
Since there are three rotor blades, the moment of inertia will be;
I = 3(1/3mr²)
I = mr²
Given
m = 120kg
r = 3.50m
Required
Moment of inertia
Substitute the given values and get I
I = 120(3.50)²
I = 120(12.25)
I = 1470kgm²
Hence the moment of inertial of the three rotor blades about the axis of rotation is 1470kgm²
What is the period of revolution about the Sun for an asteroid with a semimajor axis of 3 AU in the middle of the asteroid belt?
Answer:
The period of revolution is 5.2 years.
Explanation:
The period of revolution about the Sun for an asteroid can be found using Kepler's third law:
[tex] p^{2} = a^{3} [/tex] (1)
Where:
p: is the period =?
a: is the semimajor axis (average distance from Sun) = 3 AU
By entering "a" value into equation (1) we have:
[tex] p = \sqrt{a^{3}} = \sqrt{(3)^{3}} = 5.2 y [/tex]
Therefore, the period of revolution about the Sun for an asteroid in the middle of the asteroid belt is 5.2 years.
I hope it helps you!
What is energy?
Question 1 options:
force × distance
force
chemical change
the ability to do work
Answer:
The ability to do work
Explanation:
Energy can be defined as the ability to do work. We apply energy in basically everything we do in life, energy is needed to walk or move from one position to another, it is required to eat and do other basic things of life. The body system converts the food that is being consumed into energy, this energy can be switched from one form to another.
There are various forms of energy which include solar energy , wind energy, electrical energy, mechanical energy, kinetic energy, potential energy etc. This forms of energy can be converted from one form to anothe but cannot be destroyed.
Answer:
ability to work
Explanation:
how do u forensically establish car movements ?
Answer:
i think issa uh.. i think issa carrot
Explanation:
When a skateboarder comes to a stop at the top of either side of a ramp, what happens to the potential and kinetic energy?
Answer:
potential is at maximum
kinetic energy is zero
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
the wavelength produce by a shallow water body is 200mm. If the refractive index is 0.5. calculate the wavelength in deep water
Answer:
400mm
Explanation:
Refractive index is the ratio of the wavelength in the shallow water to that in deep water.
Refractive index = λs/λd
Given
Refractive index = 0.5
λs = 200mm
Required
0.5 = 200/λd
λd = 200/0.5
λd = 400mm
Hence the wavelength in deep water is 400mm
A double slit is illuminated simultaneously with orange light of wavelength 600 nm and light of an unknown wavelength. The m=4 bright fringe of the unknown wavelength overlaps with the m=3 fringe of the orange light. What is the unknown w
Answer:
Explanation:
distance of 4 th bright fringe of unknown light = distance of 3 rd bright fringe of orange light . Let λ be wavelength of unknown light .
4 λ D / d = 3 x 600 x D / d
4 λ = 3 x 600
λ = 450 nm .
5 things that absorb light
Answer:
Materials that absorb sunlight well include dark surfaces, water and metal. The sun's light energy arrives as a mixture of visible light, ultraviolet and infrared; some materials absorb all these wavelengths well, while others are better suited to a certain restricted types of light.
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.
Which best describes the law of conservation of mass? The coefficients in front of the chemicals in the reactants should be based on the physical state of the products. Products in the form of gases are not considered a part of the total mass change from reactants to products. When reactants contain both a solid and a liquid, the solid counts toward the overall mass and the liquid does not. O The mass of the reactants and products is equal and is not dependent on the physical state of the substances.
Answer:
Explanation:
1. when both sides of the reactants and the products are equal
like h+oh ⇒ h20
hydrogen has 2 atoms on both sides and oxygen has one on both sides
2. no they are put to balance the equation
3. nope they are treated equally as all the other states
4. no if u are talking about a formula unit like NaCl for example it is aqueous not each element taken on its own if u are talking about just elements then i said before all states are treated equally
5. yup
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)
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
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
Select the correct term to complete each sentence. If you the wavelength, the electromagnetic radiation energy will double. The energy of the electromagnetic radiation will if you halve the wavenumber. When the frequency of the light is doubled, its energy will
Answer:
A) If you halve the wavelength, the electromagnetic radiation energy will double.
B) The energy of the electromagnetic radiation will halve if you halve the wavenumber.
C) When the frequency of the light is doubled, its energy will double.
Explanation:
The function for the light frequency is given as
The energy supplied to each electron is doubled by halving the wavelength, nearly doubling its kinetic energy by two after it is free from the metal. It is important to remember that for a given period of time, the number of electrons ejected will remain constant.
Cheers
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
A block of wood is floating in a pool of water. How does the volume of water displaced by the block compare to the volume of the block?
Answer:
The volume of water displaced the same as the volume of the block.
Explanation:
With respect to the principle of floatation, when an object floats in a fluid; its weight is the same as the volume of the fluid displaced.
The volume of the block relates to is dimension and size which can be compared with the volume of the fluid displaced. When the block is floats in water, it would displace a reasonable volume of water. Thus, it would be expected that the volume of water displaced by the block is equal to the volume of the block.
A frog leaps with a displacement equal to vector u and then leaps with a displacement equal to vector v, as
shown below.
Answer:
The answer is B on khan academy
Explanation:
A frog leaps with a displacement equal to vector u and then leaps with a displacement equal to vector v, as shown below.
Which diagram(s) shows a valid way to find the frog's total displacement?
THE ANSWER IS IN THE ATTACHMENT!
Mechanical energy appears in the form of _____ energy and _____ energy.
Answer:
Potential and kinetic
Explanation:
If you are doing ck12 this is the answer
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.what is an Electrical transformer?
Answer:
A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another, or multiple circuits.
Explanation:
Hope it helps
Answer:
A transformer with eletric abilities.
Explanation:
why it is important to take care of our body?
Answer:
You need to care for the body to stay fit, healthy and clean.