What happens when an electrically charged balloon is placed close to an uncharged soda can?

The balloon attracts the can.
The balloon is negatively charged.
The can attracts the balloon.
The can becomes positively charged.

The coefficient of kinetic friction for the surfaces in contact is \(0.31\)

The coefficient of kinetic friction can be determined using the equation:

\(\mu  = F_f / F_n\)

where:
\(\mu\) is the coefficient of kinetic friction
\(F_f\) is the force of friction
\(F_n\) is the normal force

Given that the block is pushed at a constant speed, we know that the force of friction is equal and opposite to the applied force. So, \(F_f = 15 N\)

The normal force can be calculated using the equation:

\(F_n = m * g\)

where:
m is the mass of the block (\(5.0 kg\))
g is the acceleration due to gravity (\(9.8 m/s^2\))

\(F_n = 5.0 kg * 9.8 m/s^2\)

\(= 49 N\)

Now we can substitute the values into the equation to find the coefficient of kinetic friction:

\(\mu  = 15 N / 49 N\)

\(= 0.31\) (rounded to two decimal places)

Therefore, the coefficient of kinetic friction for the surfaces in contact is \(0.31\)

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When you bend forward to pick up an object, the pressure on your lower back is influenced by various factors, including the weight of the object, the angle of your bend, and the position of your spine. However, it is important to note that pressure is not directly equal to weight. Pressure is a measure of force per unit area.

If you lift an object weighing 20 pounds (9.07 kg) with an improper lifting technique, it can still put strain on your lower back, especially if you repeatedly lift heavy objects without proper form or support.

It's crucial to use proper lifting techniques, such as bending your knees and keeping your back straight, to minimize the risk of injury to your spine and lower back muscles.

If you experience persistent or severe back pain, it is advisable to consult a healthcare professional for an accurate evaluation and appropriate guidance.

They can provide specific advice based on your individual circumstances and help you prevent potential back injuries.

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The photoelectric effect shows that light can behave like a particle.

What is the photoelectric effect?

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a) The momentum after collision of the ball Q is 12.8 m/s

b) The impulse on the ball P is 0.448 Ns.

We know that the momentum of the object can be obtained as the product of the mass and the velocity of the object. In this case, we can see that we have; Ball P of mass of 0,16kg moving east at a speed of 10m.s collide head on with another ball Q of mass 0,2kg moving west at a speed of 15m.s.

Given that;

Momentum before collision = Momentum after collision

(0.16 * 10) + (0.2 * 15) = (0.16 + 0.2) v

V = velocity after Collison

v = 1.6 + 3/0.36

v = 12.8 m/s

What is the impulse;

Impulse = Mv - Mu

Impulse = 0.16(12.8 - 10)

= 0.448 Ns

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One of the key areas of science is the study of acceleration and deceleration. Any object's rate of changing velocity is referred to as its acceleration, and a negative acceleration value is referred to as deceleration.

Using beginning velocity of 50 miles per hour,

It's going to

Final speed: 73.33 ft/s, v = 0, and a2: -22 ft/s2.

Utilize the formula: v2 = v0 + 2as

n 0 = 5377.29 + (-44) s

s =5377.29/44 = 122.21 ft

v2 = u2 + 2as is the third equation of motion. We are already aware that distance is equal to average velocity times time. Either v2 = u2 + 2as or 2as = v2 - u2. The third equation of motion connects the particle's final velocity (v), initial velocity (u), constant speed (a), and displacement (S).

Speed is defined as the ratio of distance travelled to the amount of time required to cover that distance.

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Answer:

A blackbody, or Planckian radiator, is a cavity within a heated material from which heat cannot escape. No matter what the material, the walls of the cavity exhibit a characteristic spectral emission, which is a function of its temperature.

Example:

Emission from a blackbody is temperature dependent and at high temperature, a blackbody will emit a spectrum of photon energies that span the visible range, and therefore it will appear white. The Sun is an example of a high-temperature blackbody.

Answer:

Specific activity is defined as the activity per quantity of atoms of a particular radionuclide. It is usually given in units of Bq/kg, but another commonly used unit of activity is the curie (Ci) allowing the definition of specific activity in Ci/g.

SI unit: becquerel

In SI base units: s−1

Other units: rutherford, curie

Answer:

G is called the constant of gravitation and is equal to 6.67 × 10−11 newton-metre2-kilogram−2.

Explanation: I hope this helps* pls mark me brainliest*

Answer:

I do belive that it is B hrs cn I an gn

Answer:

no i haven't. i will

Explanation:

Option d. A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the velocity of the bullet increases at 9.8 m/s each second.

Assuming air rubbing is dismissed, the slug will encounter just a single power, which is the power of gravity. The power of gravity will make the slug advance descending at a consistent pace of 9.8 m/s² (or 32.2 ft/s²) no matter what its underlying speed. Thusly, the right response is d) the speed of the projectile will increment at a consistent pace of 9.8 m/s (or 32.2 ft/s) each second until it raises a ruckus around town.

It is essential to take note of that this accepts that the projectile is shot straight down and not at a point, as the speed of the slug would then be impacted by both the power of gravity and the power of air obstruction. Moreover, in the event that the helicopter isn't completely fixed or on the other hand assuming there is wind or different elements influencing the slug's direction, the shot's speed may not follow this definite example.

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Answer:

A.

Explanation:

it's needed top release energy due to the breaking of chemical bonds.

Answer:

A: the ice releases energy which causes chemical bonds to break, changing the water to ice.

Explanation:

Answer:

1) The radius of the tire is approximately 0.28966 meters

2) The centripetal force is the force that keeps a body moving on a circular path

Explanation:

1) The linear speed of the automobile tire = 20.0 m/s

The period with which the tire turns = 0.091 s

The period = The time it takes to make a complete turn

Therefore;

The number of turns in 1 second = 1/0.091 ≈ 10.989 turns

The distance covered with 10.989 turns, assuming no friction = 10.989 × The circumference of the tire

∴ The distance covered with 10.989 turns, assuming no friction = 10.989 × 2 × π × Radius of the tire

From the speed of the car, 20.0 m/s, we have;

The distance covered in 1 second = 20.0 meters

Therefore;

10.989 × 2 × π × Radius of the tire = 20.0 meters

Radius of the tire = (20.0 meters)/(10.289 × 2 × π) ≈ 0.28966 meters

The radius of the tire ≈ 0.28966 meters

2) The centripetal force is the force required to maintain the curved motion of an object, and having a direction towards the center of the rotary motion.

The centripetal force is given by the formula, \(F = \dfrac{m \cdot v^2}{r}\)

Where;

F = The centripetal force

m = The mass of the object

v = The linear velocity of the object

r = The radius of the rotational motion.

Answer:

It is possible by increasing the speed of the tennis ball by a factor of (Mass of the tennis ball)/(Mass of the basketball)

Explanation:

The momentum of a body = The bod's mass × The body's velocity

Therefore, the momentum of a given mass of an object, such as a tennis ball can be increased by increasing the velocity or speed of the object. Whereby the speed of the ball, v₁, is increased such that the momentum of the basketball and the tennis ball will be the same, is given by the following equation

Mass of the basketball × v₂ = Mass of the tennis ball × v₁

Therefore, v₁/v₂ = (Mass of the tennis ball)/(Mass of the basketball)

A 25.5 kg video cart is rolled down a hallway. It is accelerated at 0.12 m/s2. If a force of 30 N is applied to move the cart . The wheels have 26.4 N  force of friction against the floor

Force of friction is that force  that resists the sliding or rolling of one solid object over another

F(applied) - friction = F net

30 - fr = mass * acceleration

30 - fr  = 25.5  *  0.12  

fr = 30 - 3.06

  = 26.4 N

The wheels have 26.4 N  force of friction against the floor

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Common pointing devices used to control screen movement include computer mouse, touch pads, touch screens, graphics tablets, and trackballs. Some of these devices, such as mic and joysticks, can be added to the computer system according to your needs.

Pointing device is a general term for any device used to control cursor movement on a computer screen.

For desktop computers, the most common pointing device is the computer mouse. A touchpad is the most common pointing device on laptop computers. Finally, the most common pointing device on smartphones and tablets is the finger on the touchscreen.

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An object's momentum is a measure of its motion, defined as the product of its mass and its velocity. This means that an object with a large mass moving at a high velocity will have greater momentum than an object with a smaller mass moving at a slower velocity.

The momentum of an object is a vector quantity, which means it has both magnitude and direction. The direction of an object's momentum is the same as the direction of its velocity. This means that if an object is moving north, its momentum is also northward. Momentum is an important concept in physics, particularly in the study of collisions and interactions between objects.

In these situations, the total momentum of a system is conserved, meaning that the sum of the momenta of all objects involved remains constant before and after the interaction. This principle is known as the law of conservation of momentum and is crucial for understanding the behavior of objects in motion.

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1. (a) The capacitance remains unchanged.

2. The cross-sectional area of the solenoid is 1.2 m^2.

3. (a) has the highest equivalent resistance.

1. If the charge on the plates is doubled, the capacitance of the parallel plate capacitor won't change. As a result, statement option (a) is correct.

2. U = (1/2) LI L I^2, where L is the solenoid's inductance, I is the current flowing through it, and U is the stored energy, which can be used to calculate the energy contained in a solenoid. The formula L = 0 n∧2 A l can be used to determine the inductance of a solenoid, where A is the solenoid's cross-sectional area, n is the number of turns per unit length, and l is the length of the solenoid. As a result, we have:

U = (1/2) L I^2 = (1/2) μ₀ n² A l I^2

Substituting the given values, we get:

3.4 J = (1/2) (4π × 10^-7 T m/A) (300 turns/m)^2 A (2.0 m) (4.0 A)^2

Solving for A, we get:

A = 1.2 m^2

Therefore, the cross-sectional area of the solenoid is 1.2 m^2.

3. The configuration of the resistors determines their equivalent resistance. In general, connecting the resistors in series results in the highest equivalent resistance. Since the resistors are linked in series, option (a) has the highest equivalent resistance.

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If I am a change in momentum cause by unbalanced forces, then i am a force. force is change in a momentum.

Momentum is defined as product of mass and velocity of the body. It is denoted by letter p and it is expressed in kg.m/s. Mathematically p = mv. it discuss the moment of the body. body having zero mass or velocity has zero momentum. The dimensions of the momentum is [M¹ L¹ T⁻¹].

The rate of change of momentum is a force applied on it. this force is unbalanced force which is responsible for the motion of the object.

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Of the given options, it is unlikely that the change in temperature of the substance would be zero over one cycle of a cyclic process. This is because in a cyclic process, the substance undergoes a series of transformations that cause changes in the internal energy, pressure, volume, and other properties.

These changes are typically accompanied by changes in temperature as the substance absorbs or releases heat. For example, in a Carnot cycle, the substance undergoes isothermal expansion and compression, during which its temperature remains constant, but then undergoes adiabatic expansion and compression, during which its temperature changes.

In contrast, the work done by the substance, the change in volume of the substance, the change in the internal energy of the substance, and the change in pressure of the substance can all be zero over one cycle of a cyclic process, depending on the specific nature of the process.

For example, if a gas undergoes a reversible isothermal expansion and compression, the work done by the gas would be zero over one cycle, since the net work done on the gas is zero. Similarly, if a gas undergoes a reversible adiabatic expansion and compression, the change in internal energy of the gas would be zero over one cycle, since the net heat added to or removed from the gas is zero.

Thus, the specific conditions of the cyclic process would determine which properties are likely to be zero over one cycle.

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Answer:

A snowmobile is used to pull two sleds across the ice. The mass of the snowmobile and the rider is 320 kg. The mass of the first sled behind the snowmobile is 120 kg and the mass of the second sled is 140 kg. The ground exerts a force of 1500 N [forward] on the snowmobile. The coefficient of kinetic friction for the sleds on ice is 0.15. Assume that no other frictional forces act on the snowmobile. Calculate the acceleration of the snowmobile and the sleds.

Explanation:

A snowmobile is used to pull two sleds across the ice. The mass of the snowmobile and the rider is 320 kg. The mass of the first sled behind the snowmobile is 120 kg and the mass of the second sled is 140 kg. The ground exerts a force of 1500 N [forward] on the snowmobile. The coefficient of kinetic friction for the sleds on ice is 0.15. Assume that no other frictional forces act on the snowmobile. Calculate the acceleration of the snowmobile and the sleds.

The acceleration of the snowmobile and the sleds is 1.08ms⁻².

Acceleration exists as the rate of change of velocity. Usually, acceleration indicates the speed exists changing, but not always. When an object moves in a circular path at a constant speed, it stands still accelerating, because the direction of its velocity exists altering.

Given:

Mass of the snowmobile and the rider= 320 kg

Mass of the first sled= 120kg

Mass of the second sled= 140kg

Forward force by ground= 1500N

The coefficient of kinetic friction= 0.15

To find:

The acceleration of the snowmobile and the sleds

Solution:

Considering the whole snowmobile and sleds in a single system, the equation for acceleration is:

Forward force - frictional force= (320+120+140) a

Frictional force= Normal reaction on the system X coefficient of kinetic friction

= (320+120+140)g X 0.15

= 870N

Substituting the value in the equation,

1500 - 870 = 580 a

or a = 1.08ms⁻²

Hence, The acceleration of the snowmobile and the sleds is 1.08ms⁻².

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Answer:

an object remains at rest (or motion) unless acted upon by an outside force

Explanation:

force that created the moon imparted velocity which was restrained by the gravitational pull of the earth

Answer:

there is less mass to move so the 2kg ball will move faster. the kinetic energy of the 5kg ball will move slower due to the fact that it needs more energy to move if it has more mass.

Answer:

the 2kg ball

Explanation:

there is less mass to move so the 2kg ball will move faster. the kinetic energy of the 5kg ball will move slower due to the fact that it needs more energy to move if it has more mass.

Given two elastic collisions; A golf ball with speed v hits a stationary bowling ball head-on and a bowling ball with speed v hits a stationary golf ball head-on. The golf ball have the greater speed after the collision is the first case (A golf ball with speed v hits a stationary bowling ball head-on).

When two elastic bodies collide, the relative speed between them after the collision is equal to the relative speed before the collision. However, the final velocities of the colliding bodies will depend on their masses. In this case, the mass of the bowling ball is more significant than that of the golf ball. Therefore, in the second case, the golf ball will not bounce as fast as in the first case. The coefficient of restitution (e) measures the fraction of relative speed between the two colliding objects after the collision, compared to the relative speed before the collision.

For an elastic collision, the coefficient of restitution is one, which means the relative speed before and after the collision is the same.The following equation can be used to calculate the final velocities: Vf1=(m1−m2/m1+m2) V1+(2m2/m1+m2) V2Vf2=(2m1/m1+m2) V1+(m2−m1/m1+m2) V2where V1 and V2 are the initial velocities of the two objects, m1 and m2 are their masses, and Vf1 and Vf2 are their final velocities.

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The correct ranking of the types of electromagnetic radiation from lowest energy to highest energy is:

v. microwave < infrared < visible < ultraviolet < x-ray

Electromagnetic radiation can be ordered based on its energy, with higher energy corresponding to higher frequencies and shorter wavelengths. The ranking provided in option v is consistent with this relationship.

Microwaves have the lowest energy among the given options, followed by infrared, visible light, ultraviolet, and x-rays, which have the highest energy.

The correct ranking of the types of electromagnetic radiation from lowest energy to highest energy is microwave < infrared < visible < ultraviolet < x-ray. This ranking is based on the energy associated with each type of radiation, with microwaves having the lowest energy and x-rays having the highest energy.

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Answer:

The maximum possible speed is 4.85 m/s.

Explanation:

The Principle Of Conservation Of Mechanical Energy

In the absence of friction, the total mechanical energy is conserved. It means that :

\(E_m=U+K\) is constant, being U the potential energy and K the kinetic energy

U=mgh

Where m is the mass of the object, g is the gravitational acceleration and h is the height from a fixed reference.

\(\displaystyle K=\frac{mv^2}{2}\)

Where v is the speed.

When the person is at a maximum height of 2 meters, the speed is 0. Thus the mechanical energy is made only of potential energy.

Let's fix the reference for the height to the point where the person is at minimum height (1 m from the ground level). The maximum height with respect to this reference is h=2.2 m - 1 m = 1.2 m.

The potential energy is:

U = m*9.8*1.2

U = 11.76m

When the person is at the minimum (zero) height, the mechanical energy is made only of kinetic energy. Since the mechanical energy is conserved, then:

\(\displaystyle \frac{mv^2}{2}=11.76m\)

Multiplying by 2 and simplifying by m:

\(v^2=2*11.76=23.52\)

Solving for v:

\(v=\sqrt{23.52}=4.85\)

\(\boxed{v=4.85}\)

The maximum possible speed is 4.85 m/s.

Answer:

Potential energy is energy that is stored in an object or system. It remains unaffected by the environment outside of the object or system. Kinetic energy is the energy of an object or a system's particles in motion.

Explanation: