Answer:
The correct option is;
C. 25 m/s
Explanation:
The initial velocity with which the boulder was thrown = 25 m/s
The path in which the boulder projectile moves = 30°
For projectile motion, we have;
The time it takes the boulder to hit the ground is given by the following equation;
y = y₀ + v₀·sin(θ₀)t -¹/₂·g·t²
Where;
y = The height of the boulder
y₀ = The initial height of the boulder = 0
g = The acceleration due to gravity = 9.81 m/s²
When the boulder touches the ground again, the value of y = 0. therefore, we have;
0 = 0 + 25 × sin(30)t -¹/₂ × 9.81 × t²= 12.5·t - 4.905·t²
From which we have, t = 0 or t ≈ 2.55 s
At t = 2.55 s The vertical velocity = v₀sin(θ₀) - g·t = 25 × 0.5 - 9.81×2.55 = -12.5 m/s
The vertical velocity, [tex]v_y[/tex] = -12.5 m/s
The horizontal velocity, vₓ = v₀·cos(θ₀) = 25×cos(30) ≈ 21.65 m/s
The magnitude of the resultant velocity before, the boulder hits the ground is given as follows
[tex]\left | v \right |[/tex] = √((vₓ)² + ([tex]v_y[/tex])²) = √(12.5² + 21.65²) = √625 = 25
The magnitude of the resultant velocity before, the boulder hits the ground is 25 m/c
NEED HELP ASAP!!!
If 100 newtons of force are applied over a distance of 50 meters for 5 seconds, how much power is used
2,500 watts
1,000 joules
10 watts
1,000 watts
Answer:
2,500 watts
Explanation:
I got this answer right on a test. I hope it works for you to.
Answer:
2500 wats
Explanation:
"As long as the baseball I hit is
moving upward, there is no air resistance. Air resistance only slows it down when it is falling downward."
Answer:
Air resistance is always in play so it always has air resitance no matter what.
Is silicone a better conductor then silver
Answer: Silicon is better
Hope it helps!!
does changing position of charges change the magnitude
Answer:
No, they will not change.
Explanation:
A car pulling out of a gas station accelerates from rest at a constant rate it covers 1200 meters in 30 seconds. What is the rate of acceleration
from the list below, which athlete would need to focus on cardiovascular endurance?
A. Body Builder
B. Baseball Player
C. Marathon Runner
D. Bowler
Answer:
A. body builder
Explanation:
An object dropped from rest and falls a distance of 80 m.
What is the objects displacement
Answer:
Δx = -80m
Explanation:
The object's displacement is -80m because it landed 80m below where it started.
Please fast ?????????
Answer:
Explanation:
Kinetic
Which two options would increase the electric force between two charged
particles?
O A. Increase the distance between the particles.
B. Increase the charge of one of the particles.
C. Decrease the charge of both particles.
O
D. Decrease the charge of one of the particles,
O E. Decrease the distance between the particles,
The two options would increase the electric force between two charged
particles is
E. decrease the distance between particles.
B. Increase the charge of one of the particles.
What is Electric force?The attractive or repulsive interaction that lies between any two charged objects should be called as the electric force.
When the distance between the particles is decreased and the charge of one particles should be increased so it increased the electric force.
hence, option b and option e are correct.
Learn more about electric force here: https://brainly.com/question/17562167
An egg is dropped from the top of the band hall. If the band hall is 25 m
tall, determine the time it takes the egg to hit the ground.
Answer:
2.26s
Explanation:
The time it takes for the egg to hit the ground can be calculated using the formula:
S = ut + 1/2at²
Where; S = distance of handball from ground (m)
t = time (s)
a = acceleration due to gravity (9.8m/s²)
u = initial velocity = 0m/s
Inserting our values into the formula, we have:
25 = (0 × t) + 1/2 (9.8 × t²)
25 = 0 + 9.8t²/2
25 = 9.8t²/2
25 × 2 = 9.8t²
50 = 9.8t²
t² = 50/9.8
t² = 5.102
t = √5.102
t = 2.258
t = 2.26s
Researchers interested in studying stress gave 150 high school seniors a very difficult math exam. After the test, the researchers measured stress by examining physiological changes with extensive medical testing that included drawing blood samples. When the test was over, they shared the results with the students, but did not publish individual data. Explain whether or not this study conforms to each of the ethical standards: Informed Consent, Debriefing, Confidentiality, and Protection from harm.
Answer:
Informed Consent- The study didn't conform this ethical standard.
Debriefing- The study conforms this ethical standard.
Confidentiality- The study conforms this ethical standard.
Protection from harm- The study conforms this ethical standard.
Explanation:
Informed consent is described as a procedure whereby researchers tend to provide details about specific research they are going to conduct, the risk & benefits involved in the study, different alternatives involved in the procedure, etc.
Debriefing is described as a process that is being conducted in any of the different psychological research encompassing human participants after specific research is completed. The researcher tends to describe the details of the research to the participants.
Confidentiality is described as one of the different code of ethics followed by health workers or psychologists. While practicing confidentiality, a psychologist tends to promise his or her participants that he or she will keep everything a secret whatever is being discussed or shared between both of them.
Protection from harm determines that the psychologists conducting research follows the ethics in which he or she has to protect all the participants from any kind of harm.
Answer:
I think its A
Explanation:
HEY can anyone tell me the Atomic Mass of Neon and also what ever the number u get pls round it!!
Answer:
20.1797 u
Explanation:
Answer:
Hey!
Your answer is that the ATOMIC MASS of Neon is 20.18 to 2 decimal places!
Explanation:
The other way is to round it to the next whole number, which is 20...
You can pick between the two as they are both correctly rounded!
The EXACT number is 20.1797.
I HOPE THIS HELPED YOU! :DWhat is the kinetic energy of a baseball traveling at a 25 mi./s with a mass of 0.56KG
Answer:
453.25 MJ
Explanation:
The formula to find kinetic energy is :
[tex]E_{k} = \frac{1}{2} X m X v^{2}[/tex]
E.k = ?
m = 0.56kg
v = 25mi./s which needs to be converted into metres per second
1mi./s= 1609.34m/s
25 mi./s = 40233.6 m/s.
E.k. = 0.5 × 0.56 × 40233.6²
e.k = 453247919.3J
E.k.= 453.25 MJ
How to work out Initial volume Boyle’s law
Answer:if i know ill tell u
Explanation:
. Exercises that specifically prepare the muscles for active movements
Answer:
Dynamic Stretching
Explanation:
Dynamic Stretching: Dynamic stretches are controlled movements that prepare your muscles, ligaments and other soft tissues for performance and safety.
A ball is projected horizontally from the top of a cliff and free falls to the ground.
Which one of the following statements accurately describes the ball's motion?
Which of the following forces does NOT act on an object sliding down an incline plane?
A. force of tension
B. force of gravity
C. normal force
D. force of friction
Answer:
d
Explanation:
force of friction.
Which object has potential energy but not kinetic energy
A. A battery in a pair of headphons
B. A car Slowing down
C. A person Climbing a ladder
D.a person riding an elevator upward
Answer:
A battery in a pair of headphons
Explanation:
Answer: A
Explanation:
All living things are made of one or more cells.
True
False
Answer:
the correct answer is false
An object accelerates from rest to a velocity of 34 m/s
over a distance of 70 m. What was its acceleration?
Answer:
6.8m/s²
Explanation:
Given parameters:
Initial velocity = 0m/s
Final velocity = 34m/s
Distance = 70m
Unknown:
To solve this problem we apply one of the motion equations;
V² = U² + 2aS
where V is the final velocity
U is the initial velocity
a is the acceleration
S is the distance covered
Input the parameters and solve;
34² = 0² + 2 x a x 70
34² = 140a
a = 6.8m/s²
A container of rocks is brought back from the Moon's surface where the acceleration due to gravity is 162 meters per second if the total mass of the container of rocks is 650 kilograms, what is its weight on
Earth's surface
Answer:
6318 N
Explanation:
From the question given above, the following data were obtained:
Acceleration due to gravity of the moon (gₘ) = 1.62 m/s²
Mass (m) of container = 650 kg
Weight (W) of container on the earth =.?
Next, we shall determine the acceleration due to gravity of the earth. This can be obtained as follow:
Acceleration due to gravity of the moon (gₘ) = 1.62 m/s²
Acceleration due to gravity of the earth (gₑ) =.?
gₘ = 1/6 × gₑ
1.62 = 1/6 × gₑ
1.62 = gₑ /6
Cross multiply
gₑ = 1.62 × 6
gₑ = 9.72 m/s²
Finally, we shall determine the weight of the container on the earth as follow:
Mass (m) of container = 650 kg
Acceleration due to gravity of the earth (gₑ) = 9.72 m/s²
Weight (W) of container on the earth =.?
W = m × gₑ
W = 650 × 9.72
W = 6318 N
Therefore, the weight of the container on earth is 6318 N
What is special about decomposers? *
a. they are autotrophs that absorb nutrients that have been digested outside their bodies.
b. they are heterotrophs that absorb nutrients that have been digested outside their bodies.
c. they are autotrophs that digest food internally (inside their bodies)
d. they are heterotrophs that digest food internally (inside their bodies)
a motorcycle stunt driver rides his motorcycle off a small ledge that is 8.4m high his initial velocity as he rides off the ledge is 25m/s in the horizontal direction how long does it take before he lands on the ground. answer= 1.3 s
Answer:
1.3s
Explanation:
What is a scientific theory?
Answer:
Scientific theories are explanations of some aspect of the natural world based on repeated observations.
Hope this helps!!!!
Answer:
The way that scientists use the word 'theory' is a little different than how it is commonly used in the lay public," said Jaime Tanner, a professor of biology at Marlboro College. "Most people use the word 'theory' to mean an idea or hunch that someone has, but in science the word 'theory' refers to the way that we interpret facts.
Explanation:
any two masses will be
Answer:
Explanation:
What???
Which of the following is not a force? *
gravity
friction
tension
acceleration
Answer:
tension
Explanation:
its a feeling
A constant net force acts on an object. Describe the motion of the object
a) constant acceleration
B) constant speed
C) constant velocity
D) increasing acceleration
Answer:
The answer is A if it was right give it the brainiest
The graph below shows the speed of a car as it drives along a racetrack.
a. When does the car have the highest velocity?
Answer:
...
Explanation:
....
Two teams of girls are having a hug of war and neither side is winning. Each of the four girls on the west team is pulling with a force of 250. N. Three of the four girls on the east team are pulling with a force of 260 N each. With what force is the fourth girl on the east pulling.
Answer:
220N
Explanation:
Given that the first time has 4 girls
each girl pull at 250N, therefore the total force
250X4= 1000N
For the second team, the three girls out of the four pulls at 260N each,
let the fourth girl pulls at xN
the total force is 3X260+x
=780+x
we know that the total force on the west must equal the total force on the east
so
1000=780+x
solving for x we have
x=1000-780
x=220N
Therefore the fourth girl on the second team pulls at 220N
Jupiter’s moon, Ganymede takes 7.15 Earth days to orbit Jupiter. Ganymede is measured to be 7.1 X 10-3 AU from Jupiter’s center. A second moon of Jupiter, Callisto, takes 16.69 Earth days to orbit Jupiter. How far away is Callisto from the center of Jupiter?
Answer:
0.0124 AU
Explanation:
Ganymede takes 7.15 Earth days to orbit Jupiter. Ganymede is measured to be 7.1 X 10⁻³ AU from Jupiter’s center.
We need to find how far away is Callisto from the center of Jupiter if a second moon of Jupiter, Callisto, takes 16.69 Earth days to orbit Jupiter. Let it is r₂. Using third law of Kepler.
[tex]T^2\propto r^3[/tex]
i.e.
[tex](\dfrac{T_1}{T_2})^2=(\dfrac{r_1}{r_2})^3\\\\\dfrac{r_1}{r_2}=(\dfrac{T_1}{T_2})^{2/3}\\\\r_2=\dfrac{r_1}{(\dfrac{T_1}{T_2})^{2/3}}\\\\r_2=\dfrac{7.1\times 10^{-3}}{(\dfrac{7.15}{16.69})^{2/3}}\\\\r_2=0.0124\ \text{AU}[/tex]
So, Callisto is 0.0124 AU from the center of the Jupiter.
