a)The speed of the ball at the time of impact will be 8.1 m/sec.
b)The time taken by the ball impacts the surface of trampoline will be 1.1 second.
What is speed?Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. Its SI unit is m/sec.
Given data;
g( gravitational acceleration) = 9.81 m/s2
u (initial velocity of ball) = 2.5 m/s
h₁(initial height of the ball) = 3.0 m
v (speed of the ball at the time of impact ) ?
The time taken by ball for upward journey = u / g
t₁ = u / g
t₁ = (2.5 m/s) / (9.81 m/s2) =
t₁ =0.2548 s
From second equation of motion,upward vertical distance covered by ball is;
[tex]\rm h_2= \frac{1}{2} gt^2\\\\ h_2=\frac{1}{2} \times 9.81 \times (0.2548)^2\\\\ h_2=0.3184[/tex]
The total distance in the downward direction travelled;
[tex]\rm h_3=h_1+h_2 \\\\ h_3=3.0+0.3184 \\\\ h_3=3.3184 \ m[/tex]
The time taken for the downward motion is;
[tex]\rm t_2 = (\frac{2 \times h_3 }{g} )^\frac{1}{2}\\\\ t_2 = 0.825 \ m/sec[/tex]
The speed of the ball at the time of impact is found as;
[tex]\rm V=gt_2 \\\\ V= 9.81 \times 0.8225 \\\\ V= 8.07 \ m/sec[/tex]
The total time of the flight of ball is;
[tex]\rm t_3 = t_1+t_2 \\\\ t_3=0.2548+0.8225 \\\\ t_3=1.0774 \ sec[/tex]
Hence,the speed of the ball at the time of impact will be 8.1 m/sec and time taken by the ball impacts the surface of trampoline will be 1.1 second.
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According to kinetic theory, which two factors are important for a successful reaction to occur?
Answer:
Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation.
Explanation:
A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.
(See picture) may I have help!!?
light from proxima centauri takes 4.3 years to reach the earth. How far away is the Proxima Centauri?
Answer:
4.246 light years
Explanation:
4.246 light years
The closest star, Proxima Centauri, is 4.24 light-years away. A light-year is 9.44 trillion km, or 5.88 trillion miles. That is an incredibly large distance. Walking to Proxima Centauri would take 950 million years.
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Answer:
4.25 light years
Explanation:
a light year is the distance light travels in one year it is equal to 9.461 x 1012 km. alpha centauri A & B are roughly 4.35 light years away from us. proxima centauri is slightly closer at 4.25 light years.
Light does not pass through some materials. What do you think happens
to the energy of photons when photons strike a surface and are
absorbed? What indicators would tell you that the energy of the photons
?
has been transformed?
Answer:
When an electron is hit by a photon of light, it absorbs the quanta of energy the photon was carrying and moves to a higher energy state. One way of thinking about this higher energy state is to imagine that the electron is now moving faster, (it has just been "hit" by a rapidly moving photon)
A photon is a quantum of EM radiation. Its energy is given by E = hf and is related to the frequency f and wavelength λ of the radiation by. E=hf=hcλ(energy of a photon) E = h f = h c λ (energy of a photon) , where E is the energy of a single photon and c is the speed of light.
Bacteria vary somewhat in size, but a diameter of 2.9 μm is not unusual.
A) What would be the volume (in cubic centimeters) of such a bacterium, assuming that it is spherical?
B) What would be the surface area (in square millimeters) of such a bacterium, assuming that it is spherical?
Answer:
a) 6.4 x 10^-12 cm^3
b) 17 x 10^-6 mm^2
Explanation
a). The shape is assumed to be spherical The volume = volume of a sphere = \frac{4}{3} \pi r^3
3
4
πr
3
V = \frac{4}{3}*3.142* 1.15^3
3
4
∗3.142∗1.15
3
= 6.3715 μm^3
1 μm^3 = 10^-12 cm^3
6.3715 μm^3 = 6.3715 x 10^-12 cm^3
==> 6.4 x 10^-12 cm^3
Answer:
See below
Explanation:
Volume of a sphere = 4/3 pi r^3
we are given diameter r = 1/2 dia = 1.45 u-meter = 1.45 x 10^-4 cm
4/3 pi (1.45 x 10^-4)^3 = 1.277 x 10^-11 cm^3 = VOLUME
1.45 u-meter = .00145 mm
Surface area = 4 pi r^2 = 4 pi (1.45 x 10^-3 ) ^2 = 2.64 x 10^-5 mm^2
A 20.0 kg trunk is pushed across the floor of a moving van by a horizontal force. If the coefficient of kinetic friction between the trunk and the floor is 0.255, what is the magnitude of the frictional force opposing the applied force?
The magnitude of the frictional force opposing the applied force is 50 N.
What is the frictional force?The friction is caused due to the relative motion between two uneven contacting surfaces.
Given is the mass of trunk m = 20kg, kinetic coefficient of friction μ = 0.255.
The normal force acting on the trunk N = mg
N = 20 kg x 9.81m /s²
N = 196.2 Newton
The friction force is
f =μN
f = 0.255 x 196.2
f =50.031 N
Thus, the magnitude of the frictional force opposing the applied force is approximately 50N.
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a wave with a frequency of 500hz is traveling at a speed of 1000m/s whats the wavelength?
any form of stored energy is described as
A long conducting cylindrical pipe has a length L
The charge distribute on the inner surface with the radius r₁ will be zero,In the region r₁<r<r₂ will also zero. While on the outer surface with radius r₂ will be -q.
What is Gauss law?The total electric flux out of a closed surface is equal to the charge contained divided by the permittivity,
According to Gauss Law. the electric flux in a given area is calculated by multiplying the electric field by the area of the surface projected in a plane perpendicular to the field.
From the Gauss law, it is stated that the field inside the conductor is zero. Charge will lie only on the surface.
(a)The charge distribute on the inner surface with the radius r₁ will be zero.
(b) In the region r₁<r<r₂ will also zero.
(c)The outer surface with radius r₂ charge distribution will be -q.
Hence, the charge distribute on the inner surface with the radius r₁ will be zero,
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A student rubs one side of an inflated balloon on her hair. This side of the balloon becomes positively charged. Explain this.
Answer:
Friction
Explanation:
Friction between two conductive objects creates static energy in this example making the hair stick up as if it is connected to the balloon. Hope this helps!
which statement best describes balancing equations and the law of conservation of mass?
There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the
reactants and in the products.
There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in
the products
Go
Answer:
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
Waldo gets stopped by the police.
Answer:
At least they found him.
Explanation:
Given the information in the velocity vs. time graph, what is the displacement of the object after 1 second?
In the velocity vs. time graph, the displacement of the object after 1 second is 3 m.
What is displacement?The displacement of an object is the change in position of the object.
From the graph, the displacement of the object after 1 second is calculated as follows;
x = vt
where;
v is velocity = 3 m/st is time = 1 secondx = 3 x 1 = 3 m
Thus, in the velocity vs. time graph, the displacement of the object after 1 second is 3 m.
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Differentiate amihan and habagat
Answer:
Amihan is known as the Northeast monsoon while Habagat is known as the Southwest monsoon.
How do the stomach and the small intestines work together to digest the food? (2 points)
The stomach breaks down the food and passes it to the small intestine to be digested further.
The stomach passes the digested food from the small intestine to the large intestine.
The small intestine turns the solid food into a liquid mixture and sends it to the stomach.
The stomach digests the food by using digestive juices made by the small intestine.
Answer:
A) The stomach breaks down the food and passes it to the small intestine to be digested further.
Explanation:
I am pretty sure it is the first option because there is no way the stuff you eat can be turned into a liquid, it wouldn't make sense for the stomach to pass the digested food from small intestine to large intestine, so it would have to be the first one. A out of all of the options makes more sense and the stomach has to pass the digested food somewhere.
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A car accelerates uniformly in a straight line from rest at the rate of 2.3 m/s2. What is the speed of the car after it has traveled 55 m?
Answer:
The speed is =15.91ms−1. The time is =6.92s
Explanation:
Which set of terms is in the proper order, from left to right, for labeling the
reactants and products in this reaction?
H3PO4 + 3KOH + 3H20 + K3P04
A. Base, salt, water, acid
O B. Salt, acid, water, base
C. Acid, base, water, salt
O D. Base, acid, water, salt
Which best ilustrates the way in which radiation transfers thermal energy?
Answer:
B) Warm radiates to Cool
Explanation:
Radiation transfers thermal energy without need for contact, where areas with higher thermal energy (hot) transfer energy to areas with lower thermal energy (cold)
Legolas shoots 333 arrows at once from his bow. He has 177177177 arrows.
How many times can Legolas shoot his bow before he needs more arrows?
Answer:
532063
Explanation:
If he's shooting 333 arrows per shot and has 177177177 arrows, you need to divide to find the number of arrows he can shoot total, ignoring the decimal since you can't shoot a partial arrow.
177177177/333=532063
Determine the net force required to accelerate a 2,160 kg truck from 0 to 27 m/s in 10 s
∑F=m.a = m.(Δv/Δt)
∑F=2.16 x (27-0/10)
∑F=5.832 N
In what order do the stages of the birth process occur? delivery of the placenta, dilation and thinning of the cervix, delivery of the fetus uterine contractions, delivery of the placenta, delivery of the fetus delivery of the fetus, delivery of the placenta, delivery of the cervix dilation and thinning of the cervix, delivery of the fetus, delivery of the placenta
The stages of the baby birth are Dilation, strong contractions, and delivery of the baby and the placenta.
What are the stage of the birth process ?Dilation, intense contractions, and delivery of the baby and placenta are the phases of a baby's birth.
The stages of the birth process are as follows;
1. The first stage includes the latent phase, in which cervical dilation begins (3 to 5 cm) along with mild contractions, and the active phase, in which strong contractions occur along with complete or nearly complete dilation.
2. The second stage is fetus expulsion or delivery, in which the cervix is fully dilated, and the baby is born.
3. The third stage is placenta delivery or expulsion, which occurs as the placenta is delivered.
4. Dilation, intense contractions, and delivery of the baby and placenta are the phases of labor and delivery.
Hence,the stages of the baby birth are Dilation, strong contractions, and delivery of the baby and the placenta.
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Answer:
the answer is -dilation and thinning of the cervix, delivery of the fetus, delivery of the placenta
Explanation:
i took a quiz and got it right
If the trend changed toward traditional (pre-World War II) families, how would that affect women’s rights?
If the trend changed toward traditional (pre-World War II) families, the women’s rights are employment in manufacturing sector.
What is World war?
The war between two countries to take over each other's kingdom using weapons to kill each other.
Before the world war, the army needs armor, weapons, guns and tanks. Their manufacturing is only possible with many workers to work for long hours. If the men are not enough, then women are given opportunities to work with them.
Thus, the women’s rights are employment in manufacturing sector when trend changed traditional families.
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Two 74.0-kg hockey players skating at 6.15 m/s collide and stick together.
If the angle between their initial directions was 90 ∘ , what is their speed after the collision?
If the angle between their initial directions was 90 ∘ , their speed after the collision will be 4.35 m/s.
What is inelastic collision?When two moving bodies after colliding stick to each other and move together is called the inelastic collision.
In inelastic collision , momentum is remains conserved.
Initial momentum =Final momentum
m₁u₁ +m₂u₂ = (m₁ +m₂ )v
where, u₁ and u₂ represents initial velocities of two hockey players and v₁ and v₂ shows the final velocities.
m₁ =m₂ =m and u₁ = u₂ =u
Substitute the values from the question, we get
2mu = 2mv
u =v
u = v x cos (θ/2)
u = 6.15 cos(90/2)
u = v = 4.35 m/s
Thus, the speed after collision is 4.35 m/s.
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5. For the following pairs of masses, which one has the largest gravitational attraction between masses? Which one has the smallest gravitational attraction between masses? Explain.
Answer:
MOST : E LEAST : D
Explanation:
Grav attraction = G m1 m1 / r^2
G and 'r' are the same for all of the pictures, so the one picture with the biggest mass has the MOST attraction and the one with the least mass has the least attraction.
The pair with the largest gravitational attraction is the Earth and the Moon.
The pair with the smallest gravitational attraction is the Earth and a grain of sand.
The gravitational force between two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. In other words, the more massive the objects, the stronger the gravitational force between them. The closer the objects are, the stronger the gravitational force between them.
The Earth and the Moon are the most massive objects in the pair. The Earth has a mass of about 5.972 × 10²⁴ kg, and the Moon has a mass of about 7.34 × 10²² kg. The distance between the Earth and the Moon is about 384,400 km.
The grain of sand is much less massive than the Earth or the Moon. The mass of a grain of sand is about 10⁻⁶ kg. The distance between the Earth and a grain of sand is much greater than the distance between the Earth and the Moon.
Therefore, the gravitational attraction between the Earth and the Moon is much stronger than the gravitational attraction between the Earth and a grain of sand.
Here is a table of the gravitational attractions for each pair of masses:
Pair of masses Gravitational attraction
Earth and Moon 1.98 × 10²⁰ N
Earth and a grain of sand 1.0 × 10⁻¹⁷ N
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Students measure how far a snail can travel per minute. The graph shows their data. What is the speed of the snail?
Answer:
4.00 cm/min
Explanation:
v=d/t
v=10/2=20/4=30/6=5 cm/min
Which of the following is an example of a chemical change?
a
Boiling water
b
Burning paper
c
Dissolving sugar in water
d
Melting gold
b. burning paper
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What is the best description of temperature?
Temperature is the same thing as heat.
Temperature measures the number of Kelvins in a substance.
Temperature is the measurement of kinetic energy (movement of molecules).
Temperature only measures an increase in heat energy.
The physical property that determines that how easily heat and electricity pass through a material is?
A. conductivity
B. density
C. weight
D. hardness
Answer: Hello! I'm Jungkook. Here is your answer.....
A. conductivity
Explanation:
Hope this helps! Anneyong/Bye!
xoxoKookie
Find the velocity using the d/t graph below
Answer:
-10/3
Explanation:
the slope of the graph is negative, the velocity is slowing. so we know the positive answers are not correct. next we just need to figure out how much of a slope the line has. it's down 10 and over 3... soo
-10/3 looks good .. the format for the fraction is rise / run . in this case rise is negative, but other wise it's the same.
Which of the following is a function of the cardiovascular system?
A. transportation of oxygen
B. removal of carbon dioxide
C. assistance with immune function
D. All of the above
Answer:
D
Explanation:
The CV system does all of the above
