Answer:
1 m/s² down
Explanation:
"Calculate the acceleration of the elevator, and find the direction of acceleration."
Sum of forces in the +y direction:
∑F = ma
N − mg = ma
0.9 mg − mg = ma
-0.1 mg = ma
a = -0.1 g
a = -1 m/s²
The bottle's mass is 0.2 kg. The diameter of its base is 10cm. How much pressure does the bottle exert on the table? A) 64 Pa B) 25 Pa C) 6.4 Pa D) 255 Pa
Answer:
B 25pa.................................
A solenoid with 35 turns per centimeter carries a current I. An electron moves within the solenoid in a circle that has a radius of 3.0 cm and is perpendicular to the axis of the solenoid. If the speed of the electron is 3.0 ✕ 105 m/s, what is I (in A)?
Answer:
The current of the solenoid is 0.0129 A.
Explanation:
The movement of the electron within the solenoid in a circle is produced by equaling the magnetic force and the centripetal force, as follows:
[tex] F_{B} = F_{c} [/tex]
[tex] e*v \mu_{0}*n*I = \frac{m*v^{2}}{r} [/tex]
[tex] I = \frac{m*v}{e* \mu_{0}*n*r} [/tex]
Where:
I: is the current
m: is the electron's mass = 9.1x10⁺³¹ kg
v: is the electron's speed = 3.0x10⁵ m/s
μ₀: is the permeability magnetic = 4πx10⁻⁷ T.m/A
n: is the number of turns per unit length = 35/cm
r: is the radius of the circle = 3.0 cm
e: is the electron's charge = 1.6x10⁻¹⁹ C
[tex]I = \frac{m*v}{e*\mu_{0}*n*r} = \frac{9.1 \cdot 10^{-31} kg*3.0 \cdot 10^{5} m/s}{1.6 \cdot 10^{-19} C*4\pi \cdot 10^{-7} T.m/A*3500/m*0.03 m} = 0.0129 A[/tex]
Therefore, the current of the solenoid is 0.0129 A.
I hope it helps you!
What would an automobile engineer MOST LIKELY suggest to improve the efficiency of a car's engine? A) Remove the engine's cooling system. Eliminate B) Increase the air drag on the windshield. C) Utilize cheaper, low-grade gasoline for the engine. D) Reduce the internal friction of the engine's parts.
Answer:
D) Reduce the internal friction of the engine's parts.
Explanation:
To increase the efficiency of the car's engine, an engineer most like has to reduce the friction within the internal engine parts. Reducing these friction reduces the useful energy lost as heat in these internal parts of the engine, when the engine parts do work against friction to move. In most everyday activities, engines and machines, energy is usually lost as heat due to frictional forces arising from two or more surfaces in contact.
Answer:
D
Explanation:
A force of 8 N accelerates by 4 m/s^2. What would be the amount of force needed to give a final acceleration of 5.3 m/s^2
Answer:
10.6 N
Explanation:
F = ma
8 = m * 4
m = 2 kg
F = 2 * 5.3
F = 10.6 N
1. What is the mechanical energy (sum of PE +KE) throughout her trip? 2. Where is potential energy the highest? 3. Where is kinetic energy the highest? 4. Relationship statement: Height above ground to potential energy. As 5. Relationship statement: Speed (velocity) to kinetic energy. As
Answer:
1)50000J
2) At the start of the trip
3) At the end of the trip
4) The higher the height above the ground, the higher the potential energy
5) As speed increases, Kinetic Energy increase
heey help plz???????A block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 600g. Determine: (a)The minimum pressure it exerts on the surface. (3 Marks (b) The density of the block in kg/Take (g = 10N/kg . (3 Marks
Answer:
a) 300 Pa
b) 750 kgm-³
Explanation:
P = F/A
Minimum pressure exerts when the largest area on the surface,
a) P = (0.6 × 10 ) / ( 20×10 × 10^-4)
= 300 Pa
b) D = m/v
= 0.6/ (20 × 10 × 4 × 10^-6)
= 750kgm^-3
Wo siblings are arguing over what way to pull a 10 kg wagon. Boris wants to pull it to the right. Boris puts 220 N of force on the wagon. Natasha wants to pull it to the left. Natasha puts 250 N of force on the wagon. A) What is the net force on the wagon?B) What is the acceleration of the wagon?(Both parts require you to include the direction with your numerical answer.)
Answer:
a) Then net force acting on the wagon 30 [N] in a negative direction to the left
b)Acceleration of the wagon 3 m/s² in a negative direction to the left
Explanation:
The coordinates x and y show the positive direction in x-axis ( to the right) and negative direction to the left. In north-south direction positive y values are to the north and negative values to the south
The free-body diagram shows 4 forces acting
In y-axis:
The weight ( P = m*g = 10 [kg]*9,8 [m/s²] = 98 [N] negative
Normal reaction force Fn = P = 98 [N] positive ( surface is frictionless)
∑Fy = 0 P - Fn = 0 P = Fn = 98 [N]
In x-axis:
Boris pulling force to the right (positive ) 220 [N]
Natasha pulling force to the left ( negative) 250 [N]
∑Fx = m*a
220 [N] - 250 [N] = 10 Kg * a [N] = Kg * m /s²
-30 [kg*m/s²] = 10 * Kg * a
-30/10 = - 3 m/s² = a
Sign (-) means the direction of acceleration vector is to the left (the same direction of the movement )
Then net force acting on the wagon 30 [N] in negative direction to the left
Acceleration of the wagon 3 m/s² in negative direction to the left
Which of the following items is most sensitive to increased acidity in the environment?
concrete buildings
glass windows
railroad tracks
paved roads
Answer:
Concentrate buildings
Hope it helped u if yes mark me BRAINLIEST!
Tysm!
A certain mass of oxygen has a volume of 5m^3 at 27°C.If the pressures remain constant,What will be its volume at 77°C?
I need the full answer with working
Answer:
With a pressure, for instance, of 4 atmospheres, and a volume of 5 liters yields 4 x 5 = 20. Divide the result by the number of moles of gas. If, for instance, the gas contains 2 moles of molecules: 20 / 2 = 10. Divide the result by the gas constant, which is 0.08206 L atm/mol K: 10 / 0.08206 = 121.86.
What is the acceleration of a skydiver who starting from rest reaches a speed of 40m/s in 4s?
Answer: 10 meters/ second squared
Explanation:
started from rest means that its initial velocity is 0
acceleration=(v final - v initial) / time
a= (40 - 0)/4
a= 10
For an attic space, there should be an opening to that space _____, and a clear, unobstructed passageway large enough to allow removal of the mechanical appliance.
Answer:
at least 22 inches by 30 inches.
Explanation:
For an attic space, there should be an opening to that space at least 22 inches by 30 inches (22' × 30'), and a clear, unobstructed passageway large enough to allow removal of the mechanical appliance such as an air conditioner unit.
An attic can be defined as a space or room which is found just directly below the roof of a house. An attic is a space that is often used by people to store items. It is also generally being referred to as a garret or sky parlor and sometimes it is called a loft.
According to the 2012 International Residential Code, an attic is required to have an opening space of at least 22 inches wide and 30 inches high.
Plants that listen to hard rock will grow slower than plants that listen to classical music is an example of
Answer:
Ummm... I dont know what the question really is. But I would say in English terms it is an example of Personfiction I guess
Explanation:
give the SI unit. For physics
Answer:
metre (m) - unit of length
kilograms (kg) - unit of mass
second (s) - unit of time
ampere (A) - unit of electrical current
kelvin (K) - unit of temperature
mole (mol) - unit of the amount of substance
Explanation:
A 90.0 kg person is sitting 1.00 m away from a 60.0 kg person at a football game. What is the gravitational force between them
Answer:
The force is [tex]36*10^-^9 N[/tex]Explanation:
According to newtons law on gravitation formula, which we are going to apply,
[tex]F= \frac{Gm1m2}{d^2}[/tex]
Where G represents universal gravitation constant, [tex]6.67*10^-^1^1 N.m^2/kg^2[/tex]
Given data
m1= 90 kg
m2= 60 kg
d= 1 m
Substituting our given data into the formula we have
[tex]F= \frac{6.67*10^-^1^1*90*60}{1^2}[/tex]
[tex]F= \frac{6.67*10^-^1^1*5.4*10^3}{1^2}\\\\F= 36*10^-^9 N[/tex]
The gravitational force between the two people in the football game is 3.6 * 10⁻⁷ N
Newton's law of gravitation states that the force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
F = Gm₁m₂/r²
G is the gravitational constant = 6.67 * 10⁻¹¹ N.m²/kg, m₁ = first mass = 90 kg, m₂ = second mass = 60 kg, r = distance = 1 m
F = Gm₁m₂/r²
F = 6.67 * 10⁻¹¹ N.m²/kg * 90 kg * 60 kg / 1² = 3.6 * 10⁻⁷ N
The gravitational force between the two people in the football game is 3.6 * 10⁻⁷ N
Find out more at: https://brainly.com/question/3715235
SOMEONE PLEASE HURRY!!! Identify when work is done and calculate work (in physics)
The distance record for someone riding a motorcycle on its rear wheel without stopping is more than 320000 m. Suppose the rider in this unusual situation travels with an initial speed of 8.00 m/s before speeding up. The rider then travels 40.0 m at a constant acceleration of 2.00 m/s2. What is the rider’s speed after the acceleration?
Answer:
v = 15.0 m/s
Explanation:
This is an exercise in kinematics in one dimension
v² = v₀² + 2 a x
in the exercise indicate that the initial velocity v₀ = 8.00 m / s
the distance traveled during acceleration is x = 40.0 m
let's calculate
v² = 8² + 2 2 40
v = √ 224
v = 14.97 m / s
v = 15.0 m/s
A tortoise, Bernard, starting at point A travels 12 m west and then 150 millimeters (mm) east. How far west of point A is Bernard after completing these two motions? 80m+145cm+7850mm=X mm . What is X ?
Answer:
1) 11.85 m
2) 89300 mm
Explanation:
1) The tortoise starting from point A travels 12 m west and then 150 millimeters (mm) east.
The distance traveled by the tortoise is the differrence between the distance traveled west and the distance traveled east.
Distance traveled west = 12 m
Distance traveled east = 150 mm
But 1 m = 1000 m, Therefore:
Distance traveled east = 150 mm = 150/1000 m = 0.15 m
Distance west the tortoise is from point A = Distance traveled west - Distance traveled east = 12 - 0.15 = 11.85 m
2) 1 cm = 10 m, 1000 mm = 1 m. Therefore:
[tex]145\ cm = \frac{145\ cm * 10\ mm}{1\ cm} = 1450\ mm[/tex]
[tex]80\ m = \frac{80\ m * 1000 mm}{1\ m} = 80000\ mm[/tex]
X = 80 m+145 cm+7850 mm = 80000 + 1450 + 7850 = 89300 mm
A positively charged object is placed to the left of a negatively charged object. Which best describes how the positively charged object will move
Explanation:
As per the law of electrostatics, two positive or negative charge repel each other while two opposite charge attract each other.In this case, a positively charged object is placed to the left of a negatively charged object. It would mean that the positive charge move in the direction of negative charge, so as to attract each other. Hence, the positively charged object will move to the right.Answer: B
Explanation:
Got it right on edge
the satellites stay in their orbits around the earth without the need of any amount of fuel
Explain this statement
Answer:
Satellites are able to orbit around the planet because they are locked into speeds that are fast enough to defeat the downward pull of gravity. ... Satellites do carry their own fuel supply, but unlike how a car uses gas, it is not needed to maintain speed for orbit.
Answer:
The satellites move around the earth because of gravity which builds centripetal force allowing the satellite to stay in the orbit
The radii of a wheel are 25cm and 5cm respectively.It is found that an effort of 40N is required to raise slowly a load of 160N.Find mechanical advantage
Answer:
4Explanation:
Mechanical advantage is defined as the ratio of the load to the effort applied to raise the load. If minimal effort is used to overcome a much larger load, that is when we have what is called mechanical advantage i.e a machine has been used to our advantage.
Mathematically, MA = Load/Effort
Given parameters
Load = 160N
Effort = 40N
Required
Mechanical Advantage
Using the formula above
MA = 160N/40N
MA = 4
advantage
Bears eat fruits such as berries and animals such as fish. They hibernate in the winter. They give birth to live young . Which of these terms apply to bears?
Answer:
Bears are consumers
Explanation:
The above statement shows that bears are consumers. A consumer is an individual or a party who plans to order or use acquired goods,
What is a consumer?A consumer is a person or a group who plans to order or utilize acquired goods, products, or services for personal, social, family, domestic, or similar purposes.
Any individual or group who is the final user of a product or service is referred to as a consumer.
A business that purchases a printer for internal usage. The firm that bought the printer is the client, and the employees that use it are the customers. The printer will not be resold by the firm.
Hence the statement shows that bears are consumers.
To learn more about the consumer refer to the link;
https://brainly.com/question/13420317
Which statement correctly applied to a spinning mobile that changes its velocity over a period of time?
A. The combination of all forces acting on it is zero.
B. No net force is acting on it
C. Forces are acting on it.
D. A nonzero net force is acting on it.
Answer:
forces are acting on it
Explanation:
when a body is spinning and is changing its velocity per unit, the body is said to be acted upon by forces which causes the spinning.
a body won't change in velocity unless acted by forces.
for a spinning body, a centripetal and centrifugal forces are part of those forces responsible for the spinning car and causes a shift in its velocity.
An element that is unable to create a ion and therefore always has a charge of 0 is most likely a member of a family called
Explanation:
'noble gases' which are also known as group VIII
A long, straight, horizontal wire located on the equator carries a current (conventional) toward the west. What is the direction of the force on the wire due to the Earth’s magnetic field?
Answer and Explanation: To determine the direction of force, use Right Hand Rule:
Thumb is directed to the current. In this case, to the left;
Palm of the hand towards magnetic field. In this case, since it is Earth's magnetic field, it is pointing towards south;
Then, fingers are in the direction of Force, which is downward.
In conclusion, Force on the wire is directed Downward.
Over an interval of 6 months, the tilt of the Earth’s spin axis with respect to the surrounding star fields changes by
Answer:
0°
Explanation:
Every 41,000 years, the axial tilt of the Earth varies by oscillating between 22.1 degrees and 24.5 degrees such that the Earth axis orientation with respect to background stars is relatively constant (change is 0) while rotating over one orbital period which is a duration of 12 months. The effect is that the direction of the North or South pole towards the Sun is dependent on the side of the Earth orbit the Earth is located bringing about seasonal variation.
A proton moves vertically upward and perpendicular to a uniform magnetic field. It deflects to the left as you watch it. What is the magnetic field direction?
Answer:
The magnetic field will be directed away from me into the screen
Explanation:
The force on a positive charge in a magnetic field can be shown by Lorentz right hand rule. If the palm of the left hand is held out with the fingers (representing the field) held parallel to the palm, and the thumb (representing the direction of motion of the positive charge), held perpendicular to the rest of the fingers. The palm will push in the direction of the force on the charge.
Having this in mind, if the thumb points vertically up, with the with the pal facing the left, then the fingers (representing the field) points away from me into the screen.
Which is a scientific claim?
A. Observations of certain stars explain why humans behave the way they do.
B. The constellation Orion is the easiest to recognize because of the stair in its belt.
C. Three stars in the constellation Orion looks like a belt that hunter would wear.
D. Observations of constellations show that stars have moved over time.
Answer:
D. Observations of constellations show that stars have moved over time.
Explanation:
A scientific claim is basically an observation in science.
Constellation changes there position over time because of earth's rotation around sun. So, observation of constellations shows that stars have moved over time is a scietific claim. If stars would not move then constellation will not form.
Hence, the correct answer is "of constellations show that stars have moved over time".
Answer: D
Explanation:
the scores of players on a golf team are shown in the table. the teams combined score was 0 what was travis's score?
Answer:
what table?
Explanation:
Answer:
-5
Explanation:
In an effort to decrease the mAs of an exposure, the 15% rule of kVp change may be considered. Changing the original kVp of 84 using the 15% rule will have what impact
Answer:
Will result in :Greater Compton scatter interaction
Explanation
This is because The 15% rule states that changing the kVp by 15% has the same effect as doubling the mAs, or reducing the mAs by 50%; that is A 15% increase in kVp has the same effect as doubling the mAs and vice versa but in this case reducing mas causes more Compton scatter because Compton scattering occurs at a lower kvp
how does the half life of an isotope relate to the stability of its nucleus?
Answer:
The longer the half-life, the more stable the nucleus is.
Explanation:
Well, you know that nuclear half-life represents the time needed for an initial sample of a radioactive substance to be halved. If this is the case, a long half-life would imply that it takes a very long time for the nuclide to decay to half of its initial mass. This of cource means that it is very stable.
hope this helped c; if it did give me the brainlist please c;
Answer:
If the half-life is shorter the nucles is more unstable and vice versa