A car initially traveling at 15.0 m/s accelerates at a constant rate of 4.50 m/s2 over a distance of 45.0 m, the time taken to cover this distance is mathematically given as
t = 2.24 s
What is the time taken to cover this distance?Generally, the equation for Kinematic relation is mathematically given as
S = ut + (1/2)at^2
Therefore
45 = 15t + 2.25 t^2
2.25 t^2 + 15 t -45 = 0
t = 2.24 s
In conclusion, the time is taken to cover this distance
t = 2.24 s
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Samuel pushes against a door with a force of 10N, but the door doesn't move. Has Samuel done work on the door?
No, Samuel hasn't done work, Since the door doesn't move.
What is work done?Work is said to be done when an applied force moves an object over a given distance.
W = Fd
where;
W is work doneF is the applied forced is the distanceSince the door doesn't move, we can conclude that Samuel hasn't done work.
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which best describes series
Answer:
a single closed path of electrical components including a voltage source
The quotient of 8.4x10° and a number n results in 5.6x 1027. What is the value of n?
1.5x10-18
O 1.5x10
O 1.5x10³
1.5x10¹8
What is the volume of the cone?
Answer:
42.417 cm³
Explanation:
The formula to find the volume of a cone is :
V = [tex]\frac{1}{3}[/tex] × π r² h
Here,
r ⇒ radius ⇒ 3 cm
h ⇒ height ⇒ 4.5 cm
Let us find it now.
V = [tex]\frac{1}{3}[/tex] × π r² h
V = [tex]\frac{1}{3}[/tex] × π × 3 × 3 × 4.5
V = [tex]\frac{1}{3}[/tex] × π × 9 × 4.5
V = [tex]\frac{1}{3}[/tex] × π × 9 × 4.5
V = [tex]\frac{1}{3}[/tex] × π × 40.5
V = [tex]\frac{1}{3}[/tex] × 3.142 × 40.5
V = [tex]\frac{1}{3}[/tex] × 127.251
V = 42.417 cm³
A cliff diver jumps off a 57m cliff and lands in the water 4.3 seconds later, a distance of 2.15m from the cliffs edge. What was the magnitude and direction of his starting velocity
The cliff diver jumps off with a velocity of 7.85m/s at an angle of 86° with respect to the ground.
The height of the cliff = 57m
The horizontal distance from the cliff = 2.15m
The time is taken = 4.3s
The acceleration due to gravity g = 9.81m/s²
Consider the vertical y-axis
d = 57mWe know the equationd = ut +1/2gt²
57 = u (4.3) + 1/2 (9.81) (4.3)²
57 = 4.3u + 90.69
u = -7.836m/s
The y component of initial velocity is in the upwards direction
Consider the horizontal x-axis
d = 2.15 mWe know the equation, in case of no accelerationd = ut
2.15 = u (4.3)
u = 0.5 m/s
The net velocity is the square root of the summation of the squares of the x and y components of velocity
Net velocity = 7.85m/s
For the direction, tan θ = y/x = 15.67
θ= 86°
So the cliff diver jumps off with a velocity of 7.85m/s at an angle of 86° with respect to the ground.
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Cancer and diabetes are two common hereditary diseases.
True or False?
Select the correct location on the image.
Identify the magnetic north pole of Earth’s magnet.
The magnetic north pole of the earth's magnet is in the geographic south pole.
There are two magnetic and geographic poles each, north and southThe two geographic poles are the locations where the earth's axis of rotation passes through which is imaginaryThe magnetic north and south poles are not the same as the geographic north and south polesIn a compass, the needle points to the magnetic north poleBy convention, the magnetic north pole corresponds to the geographic south poleThe magnetic south pole corresponds to the geographic north poleThe magnetic field lines of a magnet start from the magnetic north pole and end at the magnetic south poleThe magnetic north pole of the earth's magnet is the geographic south pole.
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A rare butterfly (0.01 kg) is slowly flapping its wings and moving across a road. An unsuspecting driver in a large car (1000 kg) going very fast makes a sharp turn and runs directly into the butterfly. The butterfly smashes against the windshield (of course) but the car keeps moving down the road. Which object has the greater force: The butterfly or the car?
Both the butterfly and the large car will have equal forces but in opposite direction.
Newton's third law of motion
Newton's third law of motion states that action and reaction are equal and opposite. That is, the force exerted on an object is equal to the reaction experienced by the object.
Fa = - Fb
where;
Fa is the force exerted by the large carFb is the force of the butterflyThus, both the butterfly and the large car will have equal forces but in opposite direction.
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what is the value of v2 below in the series circuit.
Answer:
[tex]\fbox {40 V}[/tex]
Explanation:
The formula we apply :
[tex]\boxed {Voltage = Current \times Resistance}[/tex]
At the point 2, current flowing will be 2A and resistance is 20Ω.
Solving :
V = 2 × 20
V = 40 V
What is bioluminescence?
A. It is when living creatures absorb light.
B. It is when living creatures reflect light.
C. It is when living creatures produce light.
D. It is when living creatures destroy light.
Answer:
C.
Explanation:
Bioluminescence is the fascinating natural phenomenon by which living creatures produce light.
A.
emotional health : expressing feelings
B.
physical health : respecting others
C.
mental health : living in harmony with the environment
D.
social health : getting adequate sleep
The equation to calculate density is D = m/v. For a liquid substance, which item increases as heat is applied?
volume
density
mass
density and volume
Answer:
See below
Explanation:
Things generally expand when heated ....so volume increases while mass remains the same .....this will cause the value of density to decrease
A flywheel is rotating at 30 rev/s. What is the total angle, in radians, through which a point on the flywheel rotates in 40 s?
The total angle, in radians, through which a point on the flywheel rotates is 7540 radians
Angular motionFrom the question, we are to determine the total angle in radians
Using the formula,
[tex]\omega = \frac{\theta}{t}[/tex]
Where [tex]\omega[/tex] is the angular velocity
[tex]\theta[/tex] is the angle
and t is the time
From the given information,
[tex]\omega = 30 \ rev/s[/tex]
Convert to rad/s
[tex]\omega = 30 \times 2\pi \ rad/s[/tex]
[tex]\omega = 188.496 \ rad/s[/tex]
and t = 40 s
From the formula
[tex]\omega = \frac{\theta}{t}[/tex]
[tex]\theta = \omega t[/tex]
∴ [tex]\theta = 188.496 \times 40[/tex]
θ = 7539.822 rad
θ ≅ 7540 rad
Hence, the total angle, in radians, through which a point on the flywheel rotates is 7540 radians
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Rana writes a summary about a mass on a spring in simple harmonic motion as it moves upward from the equilibrium position toward the maximum positive displacement. as the mass moves upward, the velocity is positive and decreasing while the acceleration is negative and decreasing. what error did rana make? the velocity should be negative, not positive. the acceleration should be positive, not negative. the velocity should be increasing, not decreasing. the acceleration should be increasing, not decreasing.
Answer:
The magnitude of acceleration should be increasing.
Velocity is positive as the mass is moving towards the maximum positive displacement. Velocity would be decreasing. Acceleration is negative as velocity is decreasing. Additionally, the magnitude of acceleration would be increasing (becomes more negative.)
Explanation:
As the mass in this question moves upwards, the displacement of this mass is becoming more positive. Hence, the velocity of this mass would be positive.
In a simple harmonic motion, velocity is:
maximized at the equilibrium position (where displacement is [tex]0[/tex],) and[tex]0[/tex] when displacement is maximized.The mass in this question is moving from [tex]0[/tex] displacement (where velocity is maximized) towards maximum displacement (where velocity is [tex]0[/tex].) Thus, the velocity of the mass would be decreasing.
Since the velocity of this mass is decreasing, the acceleration of this mass would be negative. In a simple harmonic motion, acceleration is:
[tex]0[/tex] at the equilibrium position, andmaximum when displacement is maximized, but opposite to the direction of displacement.The mass in this question is moving from the equilibrium position (where acceleration is [tex]0[/tex]) towards maximum displacement (where acceleration is most negative.) Thus, the magnitude of the acceleration of this mass would be increasing, and the acceleration of the mass would become more negative.
Answer:
the acceleration should be increasing, not decreasing.
or in other words, D.
How many electrons or protons are found in: a). +1 C of charge? b). -1 C of charge? c. -1.6 x 10^-6 C of charge? a)
Answer:
50 charges
Explanation:
it will deduct and mutiple it self and divide
The Volume Of a Body weighing is 1200 kg is 250000 [tex]cm^{3}[/tex] Find ITs density.
Write With Formula
Answer:
[tex]\boxed {Density = 4800 kg/m^{3}}[/tex]
Explanation:
Formula :
[tex]\boxed {Density = \frac{Mass (kg)}{Volume (m^{3})}}[/tex]
Convert volume into standard unit :
⇒ 250000 cm³ × 10⁻⁶
⇒ 0.25 × 10⁶ × 10⁻⁶
⇒ 0.25 m³
Solve for density :
⇒ Density = 1200 kg / 0.25 m³
⇒ Density = 1200 × 4 kg/m³
⇒ Density = 4800 kg/m³
Question 9 of 34
When you graph displacement versus time (a displacement-time graph), what
variable is on the y-axis?
O A. Speed
OB. Displacement
C. Time
O D. Velocity
SUBMIT
Answer:
Option B) Displacement
in which area of the galaxy would you find stars with fairly circular orbits about the galactic center?
Stars with fairly circular orbits about the galactic center is found in the disk
What are stars?Stars are one of the astronomical object that is usually very bright.
A circular orbit star is a star that moves in circular direction and not elliptical orbit which is most common to starts.
Therefore, Stars with fairly circular orbits about the galactic center is found in the disk
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The Voyager spacecraft is moving at 17 000 m/s. How far will it travel in one year? Give your answer in km.
Explanation:
first change m/s to km/hr and time 1 year to hour b/c we are asked the to give in km. so,
v=17,000 m/s = 17000×3600/1000 = 61,200 km/hr
t= 1 year= 365 days =365day×24 hr/day = 8,760hr
therefore, V = s/t from this s = v×t =61200×8760 =536,112,000 Km
Magnification of the image is formed by a mirror is -1.25,then answer the following questions
1. Mention the position of the object on the principle access
2. What kind of mirror is used to get the image
3. Mention the characteristics of the image
4. What is the height of the image if the object size is 2 cm
Answer:
below
Explanation:
1. in front of the mirror
2. convex mirror
3.upright and diminished
4.magnification= image height÷object height
-1.25=i.h÷2
ih=-1.25×2
i.h=-2.5
If a drag racing motorcyclist has an initial speed of 10 m/s, and then he/she
accelerates for 15 seconds at 15 m/s2, what is the velocity after 15 seconds?
O 30 m/s
O235 m/s
O225 m/s
Answer:
235 m/s
Explanation:
v = u + at
where v = final speed,
u = initial speed (10 m/s),
a = acceleration (15 m/s²),
t = time taken (15 s).
Substituting into the formula:
v = 10 + (15 x 15)
v = 10 + 225
v = 235 m/s
suggest why it is better to use light gates and a computer than to use a stopwatch and a ruler to measure the speed of a toy car
Answer:
light gates are more reliable
Explanation:
when using a manual stop watch it's difficult to stop it at an exact time. light gates able to detect when an object passes through a 'gate' with the infrared transmitter and receiver. (sorry for my explanation)
Which of the objects around you is following Newton's first law of motion?
The object which follows Newton's first law of motion around me is; my scientific calculator.
What is the Newton's first law of motion?The concept which describes objects as forever stationary except acted upon by external forces can be attributed to.the Newton's first law of motion. The postulation of the law is that; An object remains at rest if at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force. Hence, except acted upon by an external force(myself), my calculator will remain at rest.
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The objects around us that obeys newton's first law of motion are
A book placed on the top of a table,A moving car,A standing fan,A building.Newton's first law of motionNewton's first law of motion states that every object will continue to be in its state of rest on remain in uniform motion except it is acted upon by an external force.
Newton's first law of motion is also called the law of inertia
Examples of newton's first law of motion are
A book placed on the top of a tableA moving car,etc.
Hence, The objects around us that obeys newton's first law of motion are
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what kinds of investigations might have led to our current understanding of matter and energy? why is it important for scientists to use the same scientific method and consistent measurement units?
The kind of investigations might have led to our current understanding of matter and energy is research and measurement.
It is important for scientists to use the same scientific method and consistent measurement units in order to get the correct value while analayzing.
What is matter?The matter has volume and space occupied.
When conceivable the researcher endeavors to test his speculations via painstakingly planned and controlled tests that will yield quantitative instead of subjective outcomes.
Thus, the kind of investigations might have led to our current understanding of matter and energy is research and measurement.
It is important for scientists to use the same scientific method and consistent measurement units in order to get the correct value while analayzing.
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I need help!1
An ambulence is currently travelling at 15m/s and is accelerating with a constant acceleration of 5m/s^2, the ambulence is attempting to pass a car which is moving at a constant velocity of 30m/s. how far must the ambulence travel until it matches the car's velocity?
Answer:
67.5m
Explanation:
Use the kinematics equation.[tex]\frac{vf^2-vo^2}{2a} =x[/tex]
[tex]vf=30[/tex] [tex]vo=15[/tex] [tex]a=5[/tex]
[tex]\frac{30^2-15^2}{10} =x\\[/tex]
[tex]67.5=x[/tex]
An atom is the most basic particle that represents what type of matter?
OA. Element
OB. Compound
OC. Crystal
OD. Mixture
Answer:
b
Explanation:
a standby generator is connected to 1540 w lamps and a musicians 600w amplifying system how much energy is used if the generator is used for 6 hours
Answer:2140 watts x 6 hours =12.84 kWh. Are you looking for specific type units such as Jules?
Emissions from alpha decay require the least amount of shielding.
Which best describes why the emissions from alpha decay are so easily blocked compared to the emissions of other types of radioactive decay?
The particles released during alpha decay are called alpha particles. Alpha particles have greater mass and charge than other emitted particles.
Radioactive emissions are the transfer of energy through the flow of particles or waves in a mediumThere are 3 types of radioactive emissions which are alpha, beta and gammaIn alpha radiation, the nucleus emits an alpha particle which is equivalent to a helium nucleusIn beta radiation, an electron is emitted to convert a neutron to a protonIn gamma radiation, the nucleus just loses energySince alpha particles have more mass and charge, they are more ionising and lose more energy at a faster rate and can be blocked easily.
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Which of the following differentiates an audiologist from an anthropologist?
An audiologist uses empirical evidence to determine treatment.
An audiologist uses empirical evidence to determine treatment.
An audiologist examines physical characteristics of humans.
An audiologist evaluates communication methods.
An audiologist analyzes observed behaviors.
The statement that differentiates an audiologist from an anthropologist is that an audiologist examines physical characteristics of humans. That is option C.
Who is an audiologist?Audiologist is an individual that specializes in the diagnosis, treatment and management of hearing loss and balance disorders in adults and children.
An anthropologist is also an individual that studied the past and present experiences of individuals.
Therefore, the statement that differentiates an audiologist from an anthropologist is that an audiologist examines physical characteristics of humans.
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two conducting spheres are touched together
Answer:
I think its either A or B. I’m not really sure, don’t listen to me. Read my explanation and it should help you.
Explanation:
When the two conducting spheres are brought together to touch, it is as though they become one single big conductor and the total charge of the two spheres spreads out across the whole surface of the touching spheres. When the spheres are moved apart again, each one is left with half of the total original charge…
X and Y are two identical conducting spheres separated by a distance d. X has a charge of +6µC and Y has a charge of -2µC. The electric force between them is +F (i.e. attractive). The spheres are touched together and are then returned to their original separation d. What is the new value of the force between them? Any help is greatly appreciated. I assumed that since the net charge should remain the same after, there would be no change in the value of the force, but the answer scheme gives the answer as -F/3…
