Answer:
a) The magnitude of the speed of the ball at 2s is 19.62 m/s.
b) The ball has traveled 19.62 m after 2 seconds
c) The ball reaches the ground in 4.24 s.
Explanation:
a) The speed of the ball at 2 s after it was dropped is:
[tex] v_{f} = v_{0} - gt [/tex]
Where:
[tex]v_{f}[/tex]: is the final speed =?
[tex]v_{0}[/tex]: is the initial speed = 0 (it is dropped)
g: is the gravity = 9.81 m/s²
t: is the time = 2 s
[tex] v_{f} = -9.81 m/s^{2}*2 s = -19.62 m/s [/tex]
Then, the speed of the ball at 2s is -19.62 m/s. The minus sign is because the speed is in the negative direction (down).
b) The height at which is the ball after 2 seconds is:
[tex] y_{f} = y_{0} + v_{0}t - \frac{1}{2}gt^{2} [/tex]
Taking y₀ = 0 we have:
[tex] y_{f} = 0 - \frac{1}{2}*9.81 m/s^{2}*(2 s)^{2} = -19.62 m [/tex]
The ball has traveled 19.62 m after 2 seconds. The minus sign is because the height is in the negative direction.
c) The time at which the ball reaches the ground is:
[tex] y_{f} = y_{0} + v_{0}t - \frac{1}{2}gt^{2} [/tex]
[tex] t = \sqrt{\frac{88 m}{\frac{1}{2}*9.81 m/s^{2}}} = 4.24 s [/tex]
Therefore, the ball reaches the ground in 4.24 s.
I hope it helps you!
Eating nutritious foods can improve your physical health.
True
False
Answer:
True
Explanation:
How many kilocalories (Calories) does the snack bar contain?
Answer:
See the explanation below.
Explanation:
Attached is a picture of a chocolate bar that can be easily found on the market. In this picture, we see the table of contents with the amount of energy that depends on the mass in grams of the chocolate bar.
We see that for the bar size of 100G, the energy value is 483 [kcal].
We can see that the energy depends on the size of the chocolate bar.
Answer:
403.63
Explanation:
I'm assuming you were asking for the last question on the Calorimetry gizmo.
I NEED HELP PLS ASAP IM LITERALLY CONFUSED??????????
What does the force of gravity do to objects?
A.It makes them float.
B.It makes them jump.
C.It pulls them together.
D.It pushes them apart.
A train travels 25km in 5 hrs. How fast is the train going?
Answer: 5km per hour
If the train is going 25km in 5 hours, you can figure out how many kilometers per hour it is traveling by dividing 25km by the 5 hours.
25/5 = 5km per hour
Explanation:
Answer:
its 60
Explanation:
it just is man
A water rocket of mass 2.5 kg is launched vertically upwards from the surface of the Earth. It produces a steady thrust of 75 N. What is its acceleration?
Answer:
a = 30 [m/s²]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration. In this way, we have the following equation.
∑F = m*a
where:
m = mass = 2.5 [kg]
a = acceleration [m/s²]
F = force = 75 [N]
Now replacing:
[tex]75=2.5*a\\a=75/2.5\\a=30[m/s^{2} ][/tex]
Two processes of plant reproduction are described below.
Process 1: Pollen is produced by the stamen and moved by a bee to the stigma of another plant.
Process 2: Water, warm temperatures, and soil have caused a seed to sprout and grow.
Answer:
Process 1
Explanation:
Bees help move the pollen from flower to flower
Practice 4: Use the HR Diagram to match the descriptions with the correct stars
A.
Section Break
B. Main Sequence Stars
C. Super giants
D. Higher temperature stars
E. Red Stars
Answer:
Hertzsprung-Russell Diagram
The Hertzsprung-Russell diagram (HR diagram) is one of the most important tools in the study of stellar evolution. Developed independently in the early 1900s by Ejnar Hertzsprung and Henry Norris Russell, it plots the temperature of stars against their luminosity (the theoretical HR diagram), or the colour of stars (or spectral type) against their absolute magnitude (the observational HR diagram, also known as a colour-magnitude diagram).
Depending on its initial mass, every star goes through specific evolutionary stages dictated by its internal structure and how it produces energy. Each of these stages corresponds to a change in the temperature and luminosity of the star, which can be seen to move to different regions on the HR diagram as it evolves. This reveals the true power of the HR diagram – astronomers can know a star’s internal structure and evolutionary stage simply by determining its position in the diagram.
Explanation:
Hence the answer is C : Super Giants
what would happen if a sedimentary rock get exposed to high temperatures and presure
The wet density of a gravel was found to be 2.32 Mg/m^3 and the field water content was 16%. In the laboratory, the density of the solids was found to be 2.70 Mg/m^3, and the maximum and minimum void ratios were 0.59 and 0.28, respectively. Calculate the relative density (Dr) of the gravel in the field.
Answer:
the relative density of the gravel in the field is 0.7365 or 73.65%
Explanation:
Given that;
wet density of gravel [tex]r_{b}[/tex] = 2.3 Mg/m³
field water content w = 16%
density of solids in lab [tex]r_{s}[/tex] = 2.70 Mg/m³
Maximum void ratio [tex]e_{max}[/tex] = 0.59
Minimum void ratio [tex]e_{mini}[/tex] = 0.28
first we determine the dry density of gravel [tex]r_{d}[/tex] = [tex]r_{b}[/tex] / 1+ w
[tex]r_{d}[/tex] = 2.3 Mg/m³ / 1 + 0.16 = 2.3/1.16 = 1.9827 Mg/m³
we know that; [tex]r_{w}[/tex] = 1000 kg/m³ = 1 g/cm³
Specific Gravity of soil G = [tex]r_{s}[/tex] / [tex]r_{w}[/tex] = 2.70 Mg/m³ / 1 = 2.70 Mg/m³
eo = ((G×[tex]r_{w}[/tex])/[tex]r_{d}[/tex]) - 1
eo = (( 2.70 × 1) / 1.9827 ) - 1
eo = 1.3617 - 1
Co = 0.3617
so Relative density [tex]I_{D}[/tex] will be;
[tex]I_{D}[/tex] = [tex]e_{max}[/tex] - eo / [tex]e_{max}[/tex] - [tex]e_{mini}[/tex]
we substitute
[tex]I_{D}[/tex] = 0.59 - 0.3617 / 0.59 - 0.28
[tex]I_{D}[/tex] = 0.2283 / 0.31
[tex]I_{D}[/tex] = 0.7365 or 73.65%
Therefore; the relative density of the gravel in the field is 0.7365 or 73.65%
Why does a sudden change in climate lead to the extinction of a species?
O A. The species lacks adaptations for the new climate.
O B. The species moves to an area with a better climate.
C. The species chooses not to evolve with the climate.
D. The species finds it easier to survive in the new climate.
Answer:
A
Explanation:
Sudden change in climate means there is no time to change and adapt to the new temperatures/weather conditions.
Answer:
A
Explanation: Correct on A P E X
Please answer correctly plzz
Mercury is a liquid metal having a density of 13.6 g/mL. What is the
volume of 0.45 kg of mercury metal?
Answer:
[tex]\boxed {\boxed {\sf v \approx 33.088 \ mL}}[/tex]
Explanation:
The formula for density is:
[tex]d= \frac{m}{v}[/tex]
where m is the mass and v is the volume.
The mass is 0.45 kilograms and the density is 13.6 grams per milliliter. The density is given in grams, so we must convert the mass.
There are 1000 grams in 1 kilogram or [tex]\frac{1000 \ g} {1 \ kg}[/tex]. We can multiply the mass by this ratio.
[tex]0.45 \ kg * \frac{1000 \ g} {1 \ kg} = 0.45 * 1000 \ g = 450 \ g[/tex]
Now we have values for the mass and density:
[tex]13.6 \ g/mL =\frac{450 \ g}{ v}[/tex]
Cross multiply.
[tex]\frac {13.6 \ g/mL}{1} =\frac{450 \ g}{ v}[/tex]
[tex]13.6 \ g/mL * v=450 \ g * 1 \\13.6 \ g/mL * v=450 \ g[/tex]
We are trying to find the volume, so we must isolate that variable.
13.6 and v are being multiplied. The inverse of multiplication is division. Divide both sides by 13.6
[tex]\frac {13.6 \ g/mL*v } { 13.6 \ g/mL} = \frac{ 450 \ g} {13.6 \ g/mL}[/tex]
[tex]v= \frac{ 450 \ g} {13.6 \ g/mL}[/tex]
The grams will cancel.
[tex]v= 33.0882353 \ mL\\v \approx 33.088 \ mL[/tex]
The volume is about 33.088 milliliters.
What variable is the dependent variable?
A. Time
B. Temperature
Answer:
the answer is b temperature
What is the guage pressure of an object with a mass of 30 kg and 5ft height?
Answer: D=pg
Explanation:
?????
15 mm Hg is the guage pressure of an object with a mass of 30 kg and 5ft height.
What is gauge pressure?The measurement of pressure in relation to atmospheric pressure is known as gauge pressure. The zero point for this pressure measurement is set at 1 atm. With relation to atmospheric pressure, pressure is measured.
When a car climbs a mountain, the gauge pressure rises as the air pressure falls, but the tire's absolute pressure stays the same, assuming no tire leaks.
guage pressure = mass×height
= 30×5
=15 mm Hg
Therefore, 15 mm Hg is the guage pressure of an object with a mass of 30 kg and 5ft height.
To know more about gauge pressure, here:
https://brainly.com/question/29341536
#SPJ2
What is an invasive species plant??
What is the spring coefficient of a spring that stores 4000 joules of energy
when it is stretched .6 meters? *
Answer:
222.2N/m
Explanation:
Given parameters:
Elastic potential energy = 4000J
Extension = 6m
Unknown:
Spring coefficient = ?
Solution:
The elastic potential energy is the energy stored within a string.
It is expressed as;
EPE = [tex]\frac{1}{2}[/tex] k e²
k is the spring constant
e is the extension
4000 = [tex]\frac{1}{2}[/tex] x k x 6²
8000 = 36k
k = 222.2N/m
Place the atomic models in order of their atomic discoveries.
Answer/Explanation:
A timeline of atomic models
Atomic model (1808)Plum-pudding model (1904)Nuclear model (1911)Planetary model (1913)Quantum mechanical model (1926-present)
What 3 words complete the sentence?
A moving object always has energy in its
What is the mass of an object that has a force of 26 N and an acceleration of 2 m/s??
Answer:
13kg
Explanation:
Force = Mass x Acceleration
26 = Mass x 2
divide both sides by 2
26/2 = Mass
13 = Mass
Mass is 13kg
Area is used to measure length of an object?
True
False
Answer and I will give you brainiliest
[tex] \huge \boxed { \red{\bold{Aɴsᴡᴇʀ}}}[/tex]
False
perimeter is used to measure length of an object
A grandfather clock works by swinging a pendulum back and forth with a
period of 2 seconds. What is the frequency?
Answer:
For example, a wave with a time period of 2 seconds has a frequency of
1 ÷ 2 = 0.5 Hz.
Explanation:
HELP!!!!!
Explain how the sea star reproduce and why the fisherman returned to more sea stars. (page 29 - 32) (book in case needed: california inspire science reproduction of organisms grade 6 integrated unit 2 student edition) (Two parts for full points - 10 points for how the sea star reproduces including what it is called and 10 points to explain why the fisherman found more stars.) <----- That is part of a question not the points i can give you,
Answer:
A sea star that has the ability to regenerate amputated limbs must first undergo a repair phase to heal the exposed wound. Once the wound is healed, the sea star can begin to generate new cells, which in turn, sparks new growth. Regeneration can take anywhere from several months to years. Reproduction: Sea stars are broadcast spawners. Males release sperm into the water and females release eggs. The fertilized eggs hatch into a larval form that lives as plankton, sometimes for months, before settling on the sea floor in its adult form..
A person walking with a stroller at a rate of 1.5 m/s accelerates at a rate of 0.275 m/s2.
What is the velocity (in m/s) of the stroller after is has traveled 6.45 m?
Answer:
2.41m/s
Explanation:
Given parameters:
Initial velocity = 1.5m/s
Acceleration = 0.275m/s²
Distance = 6.45m
Unknown:
Final velocity = ?
Solution:
To solve this problem, we apply the kinematics equation below:
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the acceleration
S is the distance
v² = 1.5² + (2 x 0.275 x 6.45)
v = 2.41m/s
Ans: 10.0096 cm
What should be the initial lengths of steel and copper rods so that the length of steel rod is 5 cm
larger than the copper rod at all temperatures?
An iron sphere has a radius of 10 cm at a temperature of 0°C. Calculate the change in volume of the
Ans: 1.383 cm
sphere it is heated 100°. 9.3710-
Ans: 17 cm, 12 cm
Answer:
dab is the answerjdjdjnejee
What happens to density of the metal when immersed in different liquids?
Answer:
vs
Explanation:
cfshdjxjosgx xbmmnbvcxzasdg 69000
A5 kg frisbee is thrown from rest to a final speed of 12 m/s. What is the impulse of the frisbee?
Answer:
60kgm/s
Explanation:
Given parameters:
Mass of frisbee = 5kg
Final speed = 12m/s
Unknown:
Impulse of the frisbee = ?
Solution:
The impulse of the frisbee is the same as the change in momentum.
It is given as:
Impulse = mass (Final velocity - Initial velocity)
Impulse = 5(12 - 0) = 60kgm/s
Which is considered computer storage
The options are application Hard drive input and software
Answer:
Second Option
Explanation:
The "hard drive" or the second option is one of the main components of storing information on a computer. You already have a hard drive built into your computer, or laptop when you buy it, and you can buy additional hard drives in the form of plugins that can store even more data if your original hard drive becomes full of data.
Hope this helps.
Answer:
B
Explanation:
Whereas memory refers to the location of short-term data, storage is the component of your computer that allows you to store and access data on a long-term basis. Usually, storage comes in the form of a solid-state drive or a hard drive.
Which planet experiences tidal effects that are caused by the Sun?
Technically, ALL of the planets do.
The effect is greatest inside Mercury, because Mercury is the one closest to the Sun.
1. What is the kinetic energy of a 1.75 kg ball travelling at a speed of 54 m/s?
Answer:
We conclude that the kinetic energy of a 1.75 kg ball traveling at a speed of 54 m/s is 2551.5 J.
Explanation:
Given
Mass m = 1.75 kgVelocity v = 54 m/sTo determine
Kinetic Energy (K.E) = ?
We know that a body can possess energy due to its movement — Kinetic Energy.
Kinetic Energy (K.E) can be determined using the formula
[tex]K.E=\frac{1}{2}mv^2[/tex]
where
m is the mass (kg)v is the velocity (m/s)K.E is the Kinetic Energy (J)now substituting m = 1.75, and v = 54 in the formula
[tex]K.E=\frac{1}{2}mv^2[/tex]
[tex]K.E=\frac{1}{2}\left(1.75\right)\left(54\right)^2[/tex]
[tex]K.E=1458\times 1.75[/tex]
[tex]K.E=2551.5[/tex] J
Therefore, the kinetic energy of a 1.75 kg ball traveling at a speed of 54 m/s is 2551.5 J.
11. A bowling ball has a mass of 7 kg and a velocity of 3 m/s.
(A) What is the ball's momentum?
Answer: 21 kg x m/s
Momentum can be found using the equation p = mv, or momentum = mass times velocity.
Therefore, to find the momentum of the bowling bowl, you can plug the mass and velocity values into the equation to get p = (7kg)(3m/s)
Solve the equation to get a momentum of 21kg x m/s
I hope I could help :)