Answer:
a = 0.41 [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.
∑F = m*a
where:
F = force [N]
m = mass = 87 [kg]
a = acceleration [m/s²]
The frictional force will be taken as negative, since it opposes the movement of the block.
[tex]43-7.3 = 87*a\\35.7 = 87*a\\a=0.41[m/s^{2} ][/tex]
Newton's first law of motion: Objects in motion will stay in motion and objects at rest will stay at rest, unless acted on by
a. friction
b. acceleration
c. unbalanced force
d. contact force
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia
Height of cannon 5 m, initial speed of projectile 15m/s, angle of launch 0 degrees. What is the range and time in the air? Please show work!
Answer:
The range is 15.15 m and the time in the air is 1.01 s
Explanation:
Horizontal Motion
When an object is thrown horizontally (with angle 0°) with a speed v from a height h, it follows a curved path ruled exclusively by gravity until it eventually hits the ground.
The range or maximum horizontal distance traveled by the object can be calculated as follows:
[tex]\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}[/tex]
To calculate the time the object takes to hit the ground, we use the equation below:
[tex]\displaystyle t=\sqrt{\frac{2h}{g}}[/tex]
The cannon is shot from a height of h=5 m with an initial speed of v=15 m/s. The range is calculated below:
[tex]\displaystyle d=15\cdot\sqrt{\frac {2*5}{9.8}}=15*1.01[/tex]
d = 15.15 m
The time in the air is:
[tex]\displaystyle t=\sqrt{\frac{2*5}{9.8}}[/tex]
t = 1.01 s
The range is 15.15 m and the time in the air is 1.01 s
A runner exerts a force of 234 Newtons against the ground while using 1100 Watts of power. How long does it take them to run a distance of 30.0 m?
Answer:
30 seconds
Explanation:
You are classifying an organism that is unfamiliar to you.
Which characteristic would be most helpful in identifying it?
A. energy source
B. behavior
C. structure
D. communication
O E. movement
Answer:
I know that we can identify it
Explanation:
C. structure
Answer:
C
Explanation:
In order to know what organism is it, you must obeserve its structure, behavior, movement but the most important is structure.
a plane flew for 2 hours at 467 mph
Answer: Plane flew 3,614 miles
Explanation: = (2 × 467) + (5 × 536)=3, 614 miles.
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A cannonball with a perfect horizontal velocity of 80.0 m/s flies 320 m before hitting the ground. How much time was the cannonball in the air?
Time taken to reach height is 4 seconds.
Given that;
Velocity of cannon ball = 80 m/s
Height taken = 320 meter
Find:
Time taken to reach height
Computation:
S = ut + (1/2)gt²
320 = (80)(t) + (1/2)(10)(t²)
320 = 80t + 5t²
t² + 16t + 64
So,
t = 4
Time taken = 4 seconds
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If you weight 100 pounds on earth how much would you weight on the moon
Answer:
You should weigh about 16 pounds.
Explanation:
To find this, you need to find your weight and divide it by 6 to find your weight on the moon.
True or False. Water drains differently in the Northern and Southern hemispheres.
Answer: True
Explanation:
Answer:
false
Explanation:
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Calculate the force between two objects that have masses of 70 kilograms and 2,000 Kilograms separated by a distance of 1m
Answer:
The gravitational force between two objects = F = 9.3 x 10⁻⁶ N
Explanation:
Given
m₁ = 70 kg
m₂ = 2000 kg
distance r = 1 m
Thus, the gravitational force between two objects = F = Gm₁m₂ / r²
as
Gravitation constant = G = 6.67430×10⁻¹¹ N⋅m²/kg²
Thus, putting the values
F = Gm₁m₂ / r²
= (6.67430×10⁻¹¹ × 70 × 2000) / 1²
= 9.3 x 10⁻⁶ N
Thus, the gravitational force between two objects = F = 9.3 x 10⁻⁶ N
5. Define joint
answer asap plz and ty
Answer:
A point at which parts of an artifical structure are joined
How much voltage is in a circuit with a current of 0.1 A and a total resistance of 7.29 Ω?
Answer:
0.729
Explanation: by using ohms laws
A rock is thrown from the top of the Empire State Building. What is the overall acceleration it will experience?
Answer:
acceleration due to gravity is constant anywhere on the earth .its value is 9.8m/s²
Manu took a pebble and a sheet of paper both weigh one gram. His friend told that if we drop both at the same time, the pebble will fall straight to the floor, while the paper will slowly drift to the ground. Do you think friction have any role in this case? How can we relate that to the topic which we are learning today?
Answer: friction has no role to play in this case. because friction usually occurs between to parts which come in contacts. examples (a)our joints in the human body (b)two mechanical parts (shafts).
Explanation:
However what this topic relates to is gravity. The pebble and paper both weigh one gram, but have different density this is the sole reason why if both are drop from same height the pebble would reach the ground faster than the paper because it is more denser. unlike the paper with a lesser density which would take a longer time to reach the ground.
how does the thickness of wood affect its stability
Answer:
Making the lumber thick will make it stiff, which seems good. On the other hand, with thicker lumber, differences in expansion on the two faces have more leverage to make the lumber move.
What are the two forces that act on the orbit of a planet?
A) Velocity of planet and gravity between sun and planet.
B) Gravity between the aphelion and perihelion.
C) Gravity between planet and sun and the velocity of the sun.
D) Orbits of other planets and gravity between sun and planet.
HELP PLEASE!
The two forces that act on the orbit of a planet are velocity of planet and gravity between sun and planet.
What is gravity?The force that pulls items toward the center of a planet or other entity is called gravity. All of the planets are kept in orbit around the sun by gravity. Gravity applies to everything that has mass. Gravity is stronger for objects with higher mass. Along with distance, gravity weakens as well. Therefore, the gravitational pull of two things becomes stronger the closer they are to one another.
The mass of the Earth is what creates gravity. The combined gravitational force of all of its mass acts on the mass in your body.
Velocity of the planet is also related to its gravity.
Forces that acts on the orbit of a planet is force due to velocity and gravity.
To learn more about gravity refer to the link:
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What is the acceleration of a 7 kg mass pushed by a 3.5 N force?
Answer:
According to Newton's second law of motion, the acceleration of an object equals the net force acting on it divided by its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known
Explanation:
Water
Wood
Neon gas
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement
A)
wood, water, neon gas
B)
wood, neon gas, water
water, wood, neon gas
D
water, neon gas, wood
Answer:
I think the correct answer from the choices listed above is option A. The correct arrangement of the substances according to the most to the least ordered particle arrangement should be wood, water and neon gas. Wood should be the first since it is solid which has the most ordered structure as compared to the liquid and a gas. The neon gas is the last since as a gas it has the least ordered structure.
Answer:
A) wood, water, neon gas
Explanation:
wood, water, neon gas.
The particles of solids have an arrangement that is highly ordered and regular. Liquids have an arrangement that is less ordered, and the particle arrangement in gases is the least ordered and regular of the three states of matter.
tell me if im wrong .... hope this helps :)
The smallest part of any material is the _______
Answer:
Atoms and molecules
Explanation:
How do animals affect the amount of carbon earth’s atmosphere
Answer:
Animals cerate Carbon Dioxide through the process of respiration.
All animals exhale carbon dioxide out through respiration and increase the level of carbon dioxide in the atmosphere and this is intaken by the plants for photosynthesis.
What is carbon cycle ?Carbon cycle is the geological process that balance the amount of carbon dioxide in the atmosphere and biosphere. Carbon dioxide is an essential gas that maintains the living condition on earth.
All animals inhales oxygen and exhales carbon dioxide out. This carbon dioxide is used by plants to carry photosynthesis in plants. Plants absorb this carbon dioxide and combine with water forming oxygen gas and glucose.
This process repeats cyclically and the level of oxygen and carbon in the atmosphere gets balanced. Therefore, animals have a significant role in carbon dioxide cycle and oxygen cycle.
Find more on carbon cycle :
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if the pumpkin is thrown from a height of 14 meters above the ground. the velocity of the pumpkin when it is thrown is 23 m/s at 40 degrees above the horizontal. what is the value of the horizontal velocity when the pumpkin is thrown
Answer:
The value of the horizontal velocity when the pumpkin is thrown is approximately 17.619 m/s
Explanation:
The height from which the pumpkin is thrown = 14 meters
The velocity with which the pumpkin is thrown = 23 m/s
The direction in which the pumpkin is thrown = 40° above the horizontal
The horizontal component of the velocity = 23 × cos(40) ≈ 17.619
Therefore, the value of the horizontal velocity when the pumpkin is thrown ≈ 17.619 m/s
A polar bear runs at a speed of 11\,\dfrac{\text m}{\text s}11 s m 11, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction with 23,000\,\text J23,000J23, comma, 000, start text, J, end text of kinetic energy.
Answer:
380.1 kg
Explanation:
please help me swear will mark brainiest
Answer:
I think that is d option 1.0Nm anticlockwise
6. What force causes the convection cell to turn down at point C?
Cumulative Exam
Cumulative Exam Review
Active
2
Which best compares concave and plane mirrors?
Plane mirrors produce only virtual images, and concave mirr
Plane mirrors produce only real images, and concave mirror
Concave mirrors produce only real images, and convex mirro
Answer:
Explanation:
Hi! It would be A. Plane mirrors produce only virtual images,and concave mirrors produce real and virtual images.
Plane mirrors construct only virtual images, and concave mirrors make real and virtual images. Thus, this statement best corresponds concave and plane mirrors.
What are virtual images?A virtual image exists represented as the opposite of a real image, thus an image that cannot be obtained on a screen stands produced as a virtual image. The motivation for this exists in the fact that the beams of light that form a virtual image never connect therefore a virtual picture can never be projected onto a screen. Examples: Image formed in a plane mirror, an image constructed on the front and back surfaces of a spoon, etc.
Therefore, the (A) option exists as the accurate answer.
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Which forms of heat transfer do not require matter(particles) to happen? (Select all that apply)
Conduction
Convection
Radiation
None of these
Answer:
Radiation
Explanation:
The form of heat that does not require matter or particles to happen is known as radiation.
Radiation is a form of heat that is carried by electromagnetic spectrum. It does not depend on particles of the medium. Convection and conduction depends on the particles in the medium for heat transfer. Conduction and convection cannot occur in a vacuum. Radiation can transfer heat in a vacuum.TRUE OR FALSE? >:) FOR TEENS GRADE 7 ONLY
Answer:
true
Inertia. Sometimes this first law of motion is referred to as the law of inertia. Inertia is the property of a body to remain at rest or to remain in motion with constant velocity.
please give brainlist I actually needed it.
Calculate the centripetal force of a ball on a string in circular motion if the mass is 7 kg
traveling at 3 m/s and the radius of the string is 4 meters.
0 11 N
0 14 N
0 16 N
0 25 N
Answer:
F = 16 N
Explanation:
Given that,
Mass of the ball, m = 7 kg
Speed of the ball in circular motion, v = 3 m/s
The radius of the string, r = 4 m
We need to find the centripetal force of a ball on a string in circular motion. The formula for the centripetal force is given by :
[tex]F=\dfrac{mv^2}{r}[/tex]
Putting all the values in the above formula
[tex]F=\dfrac{7\times (3)^2}{4}\\\\=15.75\ N[/tex]
or
F = 16 N
Hence, the correct option is (c).
Is question II correct?
Answer:
it most likly right I'm not 100% sure
Please help me on my test :) thank uu
An insulated copper wire is wrapped around an iron nail and connected to a power
source (battery). When the circuit is closed, the nail can attract and pick up paper clips,
but when the circuit is open, the nail does not attract the paper clips. Which of the
following explanations best describes this phenomenon?
A When the circuit is open, it creates a current, and a magnetic field is induced.
B When the circuit is closed, there is neither a current nor a magnetic field.
C When the circuit is closed, it creates a current, and a magnetic field is induced.
D When the circuit is open, there is a current but no magnetic field.
Answer:
d
Explanation:
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Question 21 of 25
Calculate the capacitance of a system that stores 6.5 x 10-10 C of charge at
Q
50.0 V. Use C =
AV
A. 7.7 * 1010 F
B. 3.1 x 107 F
C. 1.3 x 10-11 F
D. 3.2 x 10-8 F
SUBMIT
Answer:
C. 1.3 x 10-11 F
I took the test and got this correct, hope this helps
Explanation: