Answer:
speed v = 0.148 m / s
velocity v = 0
Explanation:
In this exercise we must be careful that the speed is a scalar and the speed is a vector, let's start by looking for the speed
v = Δx /Δt
the distance traveled is x = 2d and the time taken is
t = 7h 30 min
let's reduce to seconds
t = 7 h 3600s / 1h + 30 min 60s / 1min = 27000 s
so the speed is
v = 2d / 27000
to finish the calculation suppose a distance traveled d = 2000 m
v = 2 2000/27000
v = 0.148 m / s
this is the raides which is the speed module
Velocity is a vector,
v = Dx / Dt
in this case the displacement is
Dx = d -d
Dx = 0
the total displacement is zero since it returns to the starting point, consequently the velocity is zero
v = 0
bold is a vector
For an organism to survive, it must acquire energy. What is an example of acquiring energy?
Question 3 options:
healing a cut or wound
eating an apple
sweating
running
answer quick plz
Answer:
eating an apple
Explanation:
Eating food gives your body the nutrients and energy it needs.
Find the magnitude of the impulse delivered to a soccer ball when a player kicks it with a force of 1360 N. Assume that the player's foot is in contact with the ball for 5.85 times 10^{-3} s. (Show your work)
please
Answer:
7.59Ns
Explanation:
Given parameters:
Force = 1360N
Time of contact = 5.85 x 10⁻³s
Unknown:
Impulse = ?
Solution:
The impulse of the ball is given as:
Impulse = Force x time
Impulse = 1360 x 5.85 x 10⁻³ = 7.59Ns
Scientists create models to better understand Earth. Which evidence has led scientists to conclude that there are different layers within Earth's interior?
A.analysis of seismic wave data
B.measurement of Earth's diameter
C.temperatures taken within each layer
D.rock samples taken from Earth's core
Answer:
it is A or D
Explanation:
Answer:
ANswer:A
Explanation:
If a man traveled to a different planet
Answer:
He would be in space.
Explanation:
Answer: What would happen if a human traveled to Uranus?
As an ice giant, Uranus doesn't have a true surface. The planet is mostly swirling fluids. While a spacecraft would have nowhere to land on Uranus, it wouldn't be able to fly through its atmosphere unscathed either. The extreme pressures and temperatures would destroy a metal spacecraft.
Explanation:
Gizmo Warm-up: Lifting a piano A pulley is a simple machine that is used to lift heavy objects. A pulley is a wheel with a groove for a rope. Pulling down on one end of the rope causes the other end to pull up. In the Object to lift menu choose Piano. What is the weight of the piano
Answer:
bruuuuuuuuh
Explanation:
id
What is the maximum mass that can hang without sinking from a 50-cm diameter Styrofoam sphere in water
This question is incomplete, the complete question is;
Styrofoam has a density of 32kg/m³.
What is the maximum mass that can hang without sinking from a 50-cm diameter Styrofoam sphere in water
Answer: the required maximum mass is 63.3459 kg
Explanation:
Given that;
diameter d = 50 cm = 0.5 m
radius r = 0.5 / 2 = 0.25 m
Styrofoam density = 32kg/m³
Volume of sphere V = 4/3 πr³.
we substitute
V = 4/3 π(0.25)³
V = 0.06544 m³
Mass of sphere M = Volume × Density
we substitute
Mass of sphere M = 0.06544 m³ × 32kg/m³
Mass of Sphere M = 2.09408 kg
Mass of the water it displace will be;
volume × density
we know that density of water = 1000 kg/m³
so
Mass of the water it displace = 0.06544 m³ × 1000kg/m³
= 65.44 kg
Now the difference between mass of water and mass of the Styrofoam will be the amount of mass that the sphere can support
so
65.44 kg - 2.09408 kg = 63.3459 kg
Therefore, the required maximum mass is 63.3459 kg
What must be the length of a simple pendulum if its oscillation frequency is to be equal to that of an air-track glider of mass 0.250 kg attached to a spring of force constant 9.75 N/m
Answer:
the length of the simple pendulum is 0.25 m.
Explanation:
Given;
mass of the air-track glider, m = 0.25 kg
spring constant, k = 9.75 N/m
let the length of the simple pendulum = L
let the frequency of the air-track glider which is equal to frequency of simple pendulum = F
The oscillation frequency of air-track glider is calculated as;
[tex]F = \frac{1}{2\pi } \sqrt{\frac{k}{m} } \\\\F = \frac{1}{2\pi } \sqrt{\frac{9.75}{0.25} } \\\\F = 0.994 \ Hz[/tex]
The frequency of the simple pendulum is given as;
[tex]F = \frac{1}{2\pi} \sqrt{\frac{g}{l} } \\\\2\pi(F) = \sqrt{\frac{g}{l} } \\\\2\pi (0.994) = \sqrt{\frac{9.8}{l} } \\\\6.2455 = \sqrt{\frac{9.8}{l} } \\\\(6.2455)2 = \frac{9.8}{l} \\\\39.006 = \frac{9.8}{l} \\\\l = \frac{9.8}{39.006} \\\\l = 0.25 \ m[/tex]
Thus, the length of the simple pendulum is 0.25 m.
In a particular crash test, an automobile of mass 1577 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 17 m/s and 1.5 m/s, respectively. If the collision lasts for 0.18 s, find the magnitude of the impulse due to the collision. Answer in units of kg · m/s.
Answer:
Ft=24,443.5 kgm/s
Explanation:
Step one
Given data
Mass of automobile m=1577kg
Initial Velocity u=17m/s
Final Velocity v=1.5m/s
Time t=0.18s
Step two
From the impulse and momentum equation
Ft=mΔv
Substitute
Ft=1577*(17-1.5)
Ft=1577*15.5
Ft=24,443.5 kgm/s
A television connected to a 120 V line uses 102 Watts of power. How much current flows through it?
a. 12240 amps
b. 0.85 amps
c. 0.85 Watts
Answer: 0.85amps
Explanation: Power = 102watts; Voltage = 120voltsP = IxV ; I = P divided by V = 102 divided by 120 = 0.85amps
A 200-kg car is moving at 50 mis. What is the kinetic energy of the car? show
Answer:
Ekin = 250000 [J]
Explanation:
The kinetic energy of a body or object can be calculated based on the mass and the speed with which it moves. This energy can be easily calculated by means of the following equation.
[tex]E_{kin}=\frac{1}{2} *m*v^{2}[/tex]
where:
m = mass = 200 [kg]
v = velocity = 50 [m/s]
Now replacing:
[tex]E_{kin}=\frac{1}{2} *200*(50)^{2}\\E_{kin}=250000[J][/tex]
PLEASE PLEASE HELP!!!!
Pablo's engineering team has developed a new material that is strong enough to withstand major impacts, including bullets, without breaking or deforming. He plans to design a new type of motorcycle helmet using the material as its outside covering. A prototype of the helmet is shown below. Pablo knows that other types of motorcycle helmets have outside coverings that bend and deform slightly on impact. So if Pablo's new helmet is going to be as effective at protecting people's heads as existing helmets, he'll need to
A.
slightly reduce the total mass of the new helmet by reducing the amount of internal cushioning.
B.
maximize the total mass of the helmet by adding flexible steel to the outside covering.
C.
increase the amount of cushioning on the inside of the new helmet to help it absorb impacts.
D.
use a thicker outside covering than other helmets to help prevent deformation even further.
Answer:
the answer is c
Explanation:
Help me with this, I'm being timed.
Answer:
I guess C
Explanation:
cause you can just try with hot water and ice cubes you know.
and we all know that ice will melt and the hot tea will get cold.
Answer:
D option
Explanation:
heat move from hot source to cold sink untill equilibrium reached
The human nervous system can propagate nerve impulses at about 102 m>s. Estimate the time it takes for a nerve impulse to travel 2 m from your toes to your brain.
Answer:
t = 0.196 s
Explanation:
The speed of a pulse is determined by the characteristics of the medium, its density and its resistance to stress, as long as these remain the speed will be constant for which we can use the kinetic expressions of the uniform movement
v = x / t
t = x / v
calculate
t = 2/102
t = 0.196 s
A simple pendulum is constructed by hanging a 3 kg mass on the end of a 0.8 m long string. The pendulum is pulled back to a height of 0.2 m and released. At what time will the mass first reach its maximum velocity
Answer:
The time when the mass will reach its first maximum velocity is 1.8 s.
Explanation:
Given;
mass of the pendulum, m = 3 kg
length of the pendulum, l = 0.8 m
height in which the pendulum is raised to, h = 0.2 m
the mass will reach its first maximum velocity when it returns to its initial position, i.e at the middle (x = 0).
the distance between the initial position of the pendulum and the height in which it is raised is the maximum displacement (A).
If we form a right angle triangle with respect to the height in which the pendulum is raised;
the height of the right triangle, H = L - 0.2 = 0.8 - 0.2 = 0.6 m
the hypotenuse side, = L = 0.8 m
the base of the triangle (opposite side) = A
A² = L² - H²
A² = (0.8)² - (0.6)²
A² = 0.28
A = √0.28
A = 0.529 m
The maximum velocity of the pendulum is calculated as;
[tex]V_{max} = A \omega\\\\V_{max} = A \sqrt{\frac{g}{l} } \\\\V_{max} = (0.529)\sqrt{\frac{9.8}{0.8} }\\\\V_{max} = 1.852 \ m/s[/tex]
The period is calculated as;
[tex]V_{max} = A\omega\\\\V_{max} = A (\frac{2\pi}{T} )\\\\T = \frac{2\pi A }{V_{max}}\\\\T = \frac{2\pi \ \times \ 0.529}{1.852} \\\\T = 1.8 \ s[/tex]
Therefore, the time when the mass will reach its first maximum velocity is 1.8 s.
A force of 40 N accelerates a 5 block at 6 m/s ^ 2 along a horizontal surface a. What would the block's acceleration be if the surface were frictionless. b. How large is the kinetic friction force? cWhat is the coefficient of kinetic friction?
Answer:
a = 8 m/s^2, Ffriction = 10 N, μk = 0.205
Explanation:
a. Force = Mass*Acceleration,
(since you didn't add the units..."5 block"....for the mass, I will assume it to be in kg, per SI units)
40 N = 5 kg*acceleration,
a = 40/5 = 8 m/s^2
b. As you know newtons second law (F=m*a) is actually in the form Fnet = m*a. Which means that if the friction force comes into play, it would be Fapplied - Ffriction = m*a.
Fapplied - Ffriction = m*a,
40 - Ffriction = 5*6,
40 - Ffriction = 30,
Ffriction = 40 - 30 = 10 N
c. The coefficient of kinetic friction is calculated by the formula "Ffriction = μk*Fnormal".
10 = μk*Fnormal (Fnormal = m*g = 5*9.8)
10 = μk*49,
μk=10/49 ≈ 0.205
Which title goes with this list: Amendments Articles Preamble?
A. Florida and County Government
B. Florida and U.S. Government
C. City and County Government
D. City and U.S. Government
If the kinetic energy of a given mass is to be doubled, its speed must be multiplied by
1) 4
2) 2
3) 8
4) 2
Answer:
Either B or D. The answer itself is 2.
Explanation:
The equation for the kinetic energy would be 1/2*mv^2.
When m is doubled, we can plug in 1 and 2 to compare our answers.
Plugging in 1 for mass would give us the answer 1/2*v^2.
Plugging in 2 for mass would give us v^2. This means that the velocity was multiplied by 2, meaning that the answer is it is multiplied by 2.
I am not sure which answer is correct since there seems to be two answer choices with 2 in it, but the answer is either B or D (I will call it ABCD because I do not want to cause confusion by saying 2 multiple times).
The image below shows four points on the orbit of a comet around the Sun.
At which point does the comet have the most gravitational potential energy?
A. Point B
B. Point A
C. Point C
D. Point D
The comet will have the most gravitational potential energy at : ( B ) Point A
Given that the gravitational potential energy between two bodies is expressed as
Ux = - GMm / d ------ ( 1 )
where :
G = gravitational constant
M = mass of larger body ( sun )
m = mass of comet
d = distance between the bodies
Therefore the greater the distance ( d ) between the bodies the less negative the potential gravitational energy the smaller body will possess. from the image attached below, the point on the orbit that is farthest from the sun is Point A
Hence we can conclude that the comet will have the most gravitational potential energy at : ( B ) Point A
Learn more about gravitational potential energy : https://brainly.com/question/15849218
Answer: its letter c
Explanation:
If a dog that has moved has a displacement of zero, it means that the dog's initial position and final position are the same. Is it T or F
Answer:
true
Explanation:
the dog hasn't moved, displacement has direction, and there is no movement or direction involved, his final position and initial are the same
Supplements are designed to replace a meal.
True
False
Answer:
the answer to your question is false.
What is the difference between a graph of linear motion and a graph of harmonic motion?
a student connects an object with mass m to a rope with a length r and then rotates the rope around her head parallel to the ground. the object takes 0.5 seconds to complete one rotation.
mass= 50 kg. length of the rope = 1.2 m
what is the objects speed of rotation?
what is the objects centripetal acceleration?
what tension force is required to maintain this motion?
The object takes 0.5 seconds to complete one rotation, so its rotational speed is 1/0.5 rot/s = 2 rot/s.
Convert this to linear speed; for each rotation, the object travels a distance equal to the circumference of its path, or 2π (1.2 m) = 2.4π m ≈ 7.5 m, so that
2 rot/s = (2 rot/s) • (2.4π m/rot) = 4.8π m/s ≈ 15 m/s
thus giving it a centripetal acceleration of
a = (4.8π m/s)² / (1.2 m) ≈ 190 m/s².
Then the tension in the rope is
T = (50 kg) a ≈ 9500 N.
What is the balance of
C2H6=C2H4+H2
Answer:
I don't get the question
3.) Brady walks 5 meters forward, turns right, walks 25 meters, turns right again, walks 5
meters, then turns left and walks 10 meters. What are Brady's distance and
displacement?
Answer:
Distance covered is: 45 meters
Displacement is 15 meters to the right of where he started
Explanation:
Notice that Brady has walk a path that looks like an incomplete rectangle of height 5 meters and length 25meters, although he actually didn't cover the full length (25 meters) when getting back to the point where he started (he made just 10 meters instead of 25 after the third turn right) See attached image.
Therefore, Brady's displacement is 15 meters to the right of where he started, and the total distance he covered is :
Distance = 5m + 25m + 5m + 10m = 45m
What does a neutron look like
Is this statement true or false?
Tornadoes are accompanied by spinning downdrafts and updrafts that form a funnel cloud.
Answer:
true true true true true
Two laboratories use radiocarbon dating to measure the age of two wooden boat fragments found at the site of an ancient
shipwreck. Lab A finds an age of 515 +/-20 years for the first object; lab B finds an age of 585 +/-30 years for the second
object. Which of the following is true?
a. Lab B's reading is more accurate than Lab A's.
b. Lab B's reading is less accurate than Lab A's.
Lab B's reading is more precise than Lab A's.
d Lab B's reading is less precise than Lah A's
C
Answer:
Answer d) Lab B's reading is less precise than Lab A's
Explanation:
Recall that accuracy is a measure of how close to the actual physical quantity the experiment leads to. In this case, we don't know what the true age is,so we cannot tell which reading is more accurate.
But we can tell which reading is more precise given the value of their reported errors. Since Lab A shows a smaller error in years (+/- 20 years versus 30 years), as well as a smaller percent error (3.9% versus 5.1%), we can say that Lab's A reading is more precise than Lab B's reading.
This agrees with answer labeled d).
If a 15kg mass weighs 372 N on Jupiter, what is Jupiter's gravitational acceleration?
Answer:
Jupiter's gravitational acceleration is 24.8 m/s^2
Explanation:
Recall that the weight under the influence of a gravitational acceleration G is defined as:
Weight = m * G
Then, in our case we have
372 N = 15 kg * G
G = 372/15 m/s^2
G = 24.8 m/s^2
Which term is applied to an object through which light passes?
A. Absorbent
B. Opaque
C. Reflective
D. Transparent
Answer:
D
Explanation:
transparent_objects that allows light to pass through and can you see through them