Answer:
1.) U = 39.2 m/s
2.) t = 4 seconds
Explanation: Given that the
height H = 78.4m
The projectile is fired vertically upwards under the acceleration due to gravity g = 9.8 m/s^2
Let's assume that the maximum height = 78.4m. And at maximum height, final velocity V = 0
Velocity of projections can be achieved by using the formula
V^2 = U^2 - 2gH
g will be negative as the object is moving against the gravity
0 = U^2 - 2 × 9.8 × 78.4
U^2 = 1536.64
U = sqrt( 1536.64 )
U = 39.2 m/s
The time it takes to reach its highest point can be calculated by using the formula;
V = U - gt
Where V = 0
Substitute U and t into the formula
0 = 39.2 - 9.8 × t
9.8t = 39.2
t = 39.2/9.8
t = 4 seconds.
A boat moves 60 kilometers east from point A to point B. There, it reverses direction and travels another 45 kilometers toward point A. What are
the total distance and total displacement of the boat?
OA. The total distance is 105 kilometers and the total displacement is 45 kilometers east.
OB. The total distance is 60 kilometers and the total displacement is 60 kilometers east.
OC. The total distance is 105 kilometers and the total displacement is 15 kilometers east.
OD. The total distance is 60 kilometers and the total displacement is 45 kilometers east.
Answer:1) the total distance is the sum of the two distances
60 km + 45 km = 105 km
2) The displacement is the net movement, or the difference between the initial position and the final position
Call x the initial position, then the final position is x + [60km - 45km]
And the displacement is x + (60km - 45km) - x =60km -45 km = 15 km
Explanation:
which of the following are good conductors under normal conditions? A. Penny B.copper wire C. a dime D.plastic E.aluminum foil F.water
Answer:
see explanation
Explanation:
A,B,C,E
B.
Because its copper
How much momentum will a dumbbell of mass 10kg transfer to the floor if it falls from a height of 80cm (assume that the dumbbell stops after hitting the ground) ? Take g=10m/s^2
(Point stealers will be reported so better dont do it)
Answer: momentum = 40kgm/s
Explanation:
Given that the
Mass M = 10kg
Height H = 80 cm = 0.8m
g = 10m/s^2
The velocity of the dumbbell as it fall can be calculated by using the formula;
V^2 = U^2 + 2gH
Since the dumbbell fell from rest, initial velocity U = 0
Substitute g and H to get final velocity V
V^2 = 0 + 2 × 10 × 0.8
V^2 = 16
V = sqrt(16)
V = 4 m/s
Momentum is the product of mass and velocity. That is,
Momentum = MV
Substitute mass M and V into the formula
Momentum = 10 × 4 = 40kgm/s
Therefore, 40 kgm/s momentum will be transferred as the dumbbell fall to the floor.
The shape of a lens affects the _____. A. direction light is bent B. color of light moving through it C. medium in which the light travels D. speed of light traveling through it
Answer:
A.The direction in which light is bent
Explanation:
That why I the topic thin lenses we learn how to draw Ray's of light
Answer:
a
Explanation:
May I please get some help?
A unicorn running on a beach at 8 m/s changes speed at a constant rate of 2.7
m/s2 over a period of 2 seconds. What is the unicorn's velocity at the end of this
time?
Answer:
13.4 m/s
Explanation:
Write down what you have, so:
V0=8 m/s
a=2.7 m/s^2
t=2 seconds
We are trying to find final velocity, so we will use vf = v0 + at
From there, we plug in the given values.
vf = 8 m/s + (2.7 m/s^2 x 2 seconds)
vf = 13.4 m/s
Answer:
about 13s
Explanation:
A 14 kilogram beam is hinged at one end. A 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object are placed as shown in the figure. The dots indicate the individual centers of gravity of the beam and objects. The center of mass of the entire system must be:
Answer: 1.3 m
Explanation:
From the figure attached, 3 materials are involved. A 14 kilogram beam hinged at one end, a 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object.
Let take the moment at the hinge axis.
The moment for the beam will be
14 × ( 0.36 + 0.53 ) = 12.6
The moment of the triangle object will be 6 × 0.36 = 2.16
The moment of capital I shape will be
7.5 × ( 0.36 + 0.53 + 1.92 ) = 21.075
The total moment = 12.6 + 2.16 + 21.075
The total moment = 35.835
The total mass = 14 + 6 + 7.5 = 27.5
The center of mass of the entire system must be:
X = total moment ÷ total mass
Substitute both in the formula
X = 35.835/27.5
X = 1.3 m.
Therefore, The center of mass of the entire system must be 1.3m
Which is true of magnetic field lines, but not electric field lines?
A. They never cross.
B. They always form complete loops.
C. They are not affected by their own source.
D. They are stronger near the source, and get weaker farther away.
Answer:
b
Explanation:
PLS HELP!
Raymond Cattell created the 16PF self-inventory assessment by first taking 4,504 personality traits and removing all of the __________.
A. nouns
B.homonyms
C.synonyms
D.antonyms
Raymond Cattell created the 16PF self-inventory assessment by taking 4,504 personality traits and removing all of the synonyms.
What is Synonym?This is defined as a word or phrase which has a close or near meaning to the other.
Raymond Cattell created the 16PF self-inventory assessment by removing the synonyms from the personality traits.
Read more about Synonyms here https://brainly.com/question/76433
When light passes from a slower medium into a faster medium, which of the following explains what will occur?
A. Light will not be refracted.
B. Light will be refracted toward a line drawn perpendicular to the point of refraction.
C. Light will be refracted away from a line drawn perpendicular to the point of refraction.
Answer:
C
Explanation:
Answer:
anser is c i just took test
Explanation:
Effieciency of a machine is never 100%
Answer:
in real life yes it's true because of energy lost in another way that we do not want. like car engine lost some energy as heat. So the energy from gasoline can't converted 100% to move the tire. Maybe it only 40-60 % energy use for move and the rest lost as heat and other
but sometime it can be 100% of efficiency on physics text book so that we can learn physics in the easiest way.
I WILL CHOOSE YOU AS BRAINLIEST , PLEASEE HELP ME IT URGENT!!!!!!!!!!!!
Relate acceleration qualitatively to a change in speed and/or direction as a result of a net force
Answer:
Over Here
Explanation:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
32. For each of the listed parts of a power plant, make a selection to indicate in what
type(s) of power station the part is found. Place your answer in in the blank space!
I. part of a coal-fired power plant
II. part of a nuclear power plant
III. part of a coal-fired power plant and part of a nuclear power plant
a. boiler. ( insert answer)
b. combustion chamber(
c. condenser(
d. control rod(
generator(
f. turbine(
From a to f choice which of the following from I, II, III is appropriate from a to F
Answer: a. boiler - I. part of a coal-fired power plant.
b. combustion chamber - I. part of a coal-fired power plant.
c. condenser - III. part of a coal-fired power plant and part of a nuclear power plant.
d. control rod - I. part of a coal-fired power plant.
e. generator- III. part of a coal-fired power plant and part of a nuclear power plant.
f. turbine - III. part of a coal-fired power plant and part of a nuclear power plant.
Explanation:
a. Boiler: It is used in the coal power plant to heat the water used for producing electricity. The boiler keeps the temperature of water or steam at a desired level.
b. Combustion chamber: It is used for combustion of coal and using thermal energy for electricity generation.
c. Condenser; It is used in both nuclear and coal power plants. It condense and receive from the turbine.
d. Control rod: It is used in the nuclear power plant for controlling the nuclear fission and fusion reactions of heavy metals.
e. Generator: It converts the thermal energy into electrical energy.
f. Turbine: The turbine blades move with the effect of steam or any form of energy and the energy so produce is used for generating electricity in generator.
How did the angel of the pendulum affect the period
Answer:The starting angle of a pendulum does not affect its period for .
Explanation: however, the period increases with increasing . The starting angle of a pendulum does not affect its period for.
A lemming running 3.22 m/s runs off a horizontal cliff. It lands in the water 7.54 m from the base of the cliff. How much time was it in the air? (Unit = s)
Answer: 2.34s
Explanation:
Given the following :
Horizontal Velocity(V) = 3.22m/s
Horizontal Distance = 7.54m
Therefore, the time spent in the air can be calculated thus:
Using the relation:
Speed = distance / time
3.22m/s = 7.54m / time
Time = 7.54m / 3.22m/s
Time = 2.34s
What is the net displacement of the particle between 0 seconds and 80 seconds?
Velocity (m/s)
chhi NSON WAO
20
40
80
280
100
Кузорил
Time (s)
OA.
160 meters
OB.
80 meters
OC.
40 meters
OD.
20 meters
OE.
0 meters
Answer: 80
Explanation:
The question is incomplete, There is no specific time for the specific velocity, which is not provided in this question instead of giving the total time interval from 0sec to 80 sec. According to my assumption, I think the net displacement will be 20 m. The correct answer will be option D.
What is net displacement?Net displacement is the total change in the position of an object, taking into account both the magnitude and direction of its motion. It is a vector quantity and is expressed in terms of distance and direction.
In other words, it is the final position of an object relative to its initial position, irrespective of the path taken. It is calculated by finding the vector difference between the final and initial positions of the object.
For example, if an object moves 10 meters to the east and then 5 meters to the north of its starting position, then its net displacement would be the vector sum of these two displacements, which is the diagonal distance between its starting and final positions.
Here in the Question,
To calculate the net displacement of the particle between 0 seconds and 80 seconds based on the given options, we can use the fact that the net displacement is the same as the final position minus the initial position.
Let's assume that the initial position is zero.
Option A. If the net displacement is 160 meters, the final position would be 160 meters. However, looking at the velocities given, we can see that the particle goes back and forth, so it does not make sense for the net displacement to be larger than the maximum displacement in one direction.
Option B. If the net displacement is 80 meters, the final position would be 80 meters. This option could be possible if the particle moves in one direction for a while and then moves back to its initial position. This is incorrect.
Option C. If the net displacement is 40 meters, the final position would be 40 meters. This option is also possible if the particle moves in one direction for a shorter period of time. This is not relevant to the question.
Option D. If the net displacement is 20 meters, the final position would be 20 meters. This option could be possible if the particle moves in one direction for a very short period of time. This is most relevant to the Question.
Option E. If the net displacement is 0 meters, the final position would be the same as the initial position, which is zero. This option could be possible if the particle moves back and forth such that the positive displacements cancel out the negative displacements.
Therefore, based on the given options, the correct answer for the net displacement of the particle between 0 seconds and 80 seconds is option D: 20 meters.
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In a weak acid solution, _____.
A.) all ions in the acid compound form water
B.) many ions in the acid compound form a base
C.) no ions separate from the acid compound
D.) few ions separate from the acid compound
Answer:
A)
Explanation:
When a forklift raises an object, is it doing positive or negative work on the object? Which type of work is the force of gravity doing on the object? a)The forklift is doing negative work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing positive work on the object because it is acting opposite to the direction of motion. b)The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion. c)The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing positive work on the object because it is acting opposite to the direction of motion. d)The forklift is doing negative work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.
Answer: B
The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.
Explanation: The work done in lifting an object up is positive when the direction of the displacement and the force applied are in the same direction.
The work will be negative if force and direction of the motion are opposite to each other.
Also, force of gravity is considered positive when an object is moving toward the gravity. That is coming downward. Otherwise, it's negative when it's moving in the opposite direction.
When a forklift raises an object, the forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.
The forklift is doing positive work on the object because the direction of
force and the direction of motion are the same. The force of gravity is
doing negative work on the object because it is acting opposite to the
direction of motion.
When a forklift is used to raise an object , it exerts a force which acts in the
same direction with its motion which signifies that it is doing a positive
work.
The force of gravity on the other hand is doing a negative work as it acts
opposite to the direction of the force and motion.
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The energy a wave carries is measured by its ____. Question 15 options: wavelength frequency amplitude speed
Answer: frequency is the answer to this question
Answer:
frequency
Explanation:
c a n v a s / a p e x :))
A hover craft also known as a air cushion vehicle glides on a cushion of air allowing it to travel with equal is land or water. The first commercial hovercraft to cross the English channel the V. A-3 had a average speed of 26.7 M/S. Its momentum at the speed was 4.8×10^4 KGM/S. What was the mass of the V. A-3?
Answer: M = 1797.75 kg
Explanation:
given parameters are;
speed V = 26.7 M/S.
momentum P = 4.8×10^4 KGM/S.
What was the mass of the V. A-3?
Momentum P is the product of mass and velocity. That is, P = MV
Substitute V and P into the formula
4.8×10^4 = 26.7 × M
Make M the subject of formula
M = 4.8×10^4/ 26.7
M = 1797.75 kg
Therefore, the mass of the V. A-3 was 1797.75 kg