In the diagram, the distance OP is the focal length of the converging lens. One ray of light from O
is shown.
Through which point will this ray pass, after refraction by the lens?

The time taken for the box B to hit the ground from its initial position is t = √ ( 2h / g ).

The time of motion of box B is the time it takes it hit the ground and the magnitude of the time of motion of the box is calculated as follows;

h = vt + ¹/₂gt²

where;

If the box starts from rest, the initial velocity = 0

h =  ¹/₂gt²

make t the subject of the formula;

t = √ ( 2h / g )

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The net force in Newtons of the object is 10N.

Solution:

m1 = 4kg

a = 2.5m/s²

Force m = ma

F = 4 * 2.5 = 10N.

The greater the net force acting on an object the greater its acceleration. Newton's second law of motion summarizes these relationships. We can rewrite the acceleration equation above to find the net force. The net force on an object is the combined effect of all compressive and tensile forces actually acting on the object.

When the forces pushing or pulling an object are unbalanced the object accelerates in the direction of the net force. The net force is the sum of all the individual forces acting on an object. Newton's first law can be viewed as a special case of Newton's second law when the net force F is zero. The acceleration must also be zero.

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Answer:

ultraviolet light

plz mark me as brainliest.

Answer:

Ultra violet

Explanation:

Given:

The speed of the wave is,

The distance between adjacent crests is,

To find:

a) What is the frequency of the waves?

b) What is the period of the waves?

Explanation:

a) The horizontal distance between two adjacent crests or troughs is known as the wavelength.

The wavelength is,

The frequency is,

Hence, the frequency is 1.71 Hz.

b)

The period of waves is,

Hence, the period of waves is 0.58 s.

Answer:

6.7 seconds

Explanation:

d=(1/2)at^2

equation

1000=(1/2)45t^2.

substitute

2000=45t^2.

multiply by 2 for both sides

44.44=t^2.

divide both sides by 45

6.7=t

take the square root of both sides

Answer:

CITY A has the highest water vapour and the least relative humidity

Explanation:

The dew point temperature is the temperature above which the water vapour will convert into liquid water.

The relative humidity is the ratio is the current water vapor content to the maximum amount of water that can be present in the air

Therefore although the temperature may be high yet the relative humidity can be considerably low

Hence, the correct option must be CITY A

Answer:

Two tuning forks with frequencies of 256 Hz and 512 Hz are struck. Which of the sounds will move faster through the air? Neither, the speed of sound is constant in air.

Answer:

Which feature is created when a block of rock dropped down in relation to the block of rock beside it?

Explanation:

Grabens drop down relative to adjacent blocks and create valleys. Horsts rise up relative to adjacent down-dropped blocks and become areas of higher topography.

A. The average speed you can use to pull the safe is 1.02 m/s

B. The time needed to pull the safe up is 17.65 s

First, we shall obtain the force. This is shown below:

F = mg

F = 60 × 9.8

F = 588 N

Finally, we shall obtain the average speed. Details below:

Power = force × average speed

600 = 588 × average speed

Divide both sides by 588

Average speed = 600 / 588

Average speed = 1.02 m/s

The time needed to pull the safe up can be obtained as follow:

Time = Total distance / average speed

Time = 18 / 1.02

Time = 17.65 s

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Complete question:

You know you can provide 600 W

of power to move large objects. You need to move a 60-kg

safe up to a storage loft, 18 m

above the floor.

Part A

With what average speed can you pull the safe straight up?

Part B

What is the time needed to pull the safe up?

The average acceleration of the motorcycle over the given distance is approximately 9.39 m/s².

To calculate the average acceleration of the motorcycle, we can use the formula:

Average acceleration = (final velocity - initial velocity) / time

First, let's convert the final velocity from km/h to m/s since the distance is given in meters. We know that 1 km/h is equal to 0.2778 m/s.

Converting the final velocity:

Final velocity = 78 km/h * 0.2778 m/s = 21.67 m/s

Since the motorcycle starts from rest (initial velocity is zero), the formula becomes:

Average acceleration = (21.67 m/s - 0 m/s) / time

To find the time taken to reach this velocity, we need to use the formula for average speed:

Average speed = total distance/time

Rearranging the formula:

time = total distance / average speed

Plugging in the values:

time = 50 m / 21.67 m/s ≈ 2.31 seconds

Now we can calculate the average acceleration:

Average acceleration = (21.67 m/s - 0 m/s) / 2.31 s ≈ 9.39 m/s²

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Answer:

P = 517.5 [kg*m/s]

Explanation:

We must remember that momentum is defined as the product of force by the time of force duration.

\(P=F*t\)

where:

P = momentum [kg*m/s]

F = force [N]

t = time [s]

\(P=345*1.5\\P=517.5[kg*m/s]\)

Answer:

-12.1

Explanation:

i’m almost sure this is it, i’m checking my old answers

if not let me know and i’ll give you some more answers

In a simple machine the direction changes by using the pulley. By applying the force on the pulley, by pushing down and the object moves up.

The simple machine allows to change the direction is a pulley. The pulley machine acts as a direction changer and is also used to change the direction of the force. When the wheel rotates, the cord can move in either direction.

The pulley has a wheel and hook. By attaching the hook to the cord, the wheel rotates making the object move up or down much easier when the force is applied to the pulley. These machines use pivot points to balance.

Hence, the simple machine called a pulley, is used to change the direction of force and makes the object moves up.

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The description that tells two processes that scientists think move Earth's lithospheric plates is convection in the mantle and pressure of magma on the edge of the plate.

The Earth's lithosphere is the rocky outer part of Earth which is made up of the brittle crust and the top part of the upper mantle.

The Earth's lithosphere deflects the convections and as the convections churn clockwise of anticlockwise, they drag the  lithosphere with it via friction an this is what is stipulated to cause tectonic plate movements.  

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Answer: convection in the mantle and pressure of magma on the edge of the plate

Explanation: I took the unit test

A. Identity vs role confusion: Mo's uncertainty about post-graduation plans.

B. Integrity vs despair: Mo's questioning of life accomplishments as an older adult.

C. Sensorimotor stage: Mo's development of motor skills and object permanence.

D. Intimacy vs isolation: Mo's struggle with forming relationships.

E. Concrete operational stage: Mo's ability to think logically and understand conservation.

A. The example matches with the Erikson stage of "identity vs role confusion." During this stage, individuals go through a period of exploration and self-discovery to establish a sense of identity and determine their roles and goals in life. Mo's uncertainty about what he wants to do after graduation reflects the challenges and decision-making processes associated with identity formation.

B. The example matches with the Erikson stage of "integrity vs despair." This stage occurs in late adulthood, where individuals reflect on their life choices, accomplishments, and experiences. Mo, as an older adult questioning his accomplishments, is facing the task of finding a sense of integrity and satisfaction with the life they have lived or experiencing feelings of despair and regret.

C. The example matches with the Piaget stage of "sensorimotor stage." This stage occurs in infancy, where children develop coordination and motor skills and begin to understand object permanence, which is the understanding that objects continue to exist even when they are out of sight. Mo's acquisition of motor skills and developing object permanence aligns with the characteristics of the sensorimotor stage.

D. The example matches with the Erikson stage of "intimacy vs isolation." This stage occurs during early adulthood, where individuals seek to form deep and meaningful relationships with others. Mo's struggle with forming a relationship with a significant other reflects the challenges and conflicts associated with the intimacy vs isolation stage.

E. The example matches with the Piaget stage of "concrete operational stage." This stage occurs in middle childhood, where children develop logical thinking and can grasp the concept of conservation. Mo's ability to think logically and understand the law of conservation aligns with the characteristics of the concrete operational stage.

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or the 3500-lb car

W= 3500lb

A). \(W= mg\)

\(m=\frac{3500}{32.2} = 108.69lbm\)

B). \(W=3500lb*4.448\frac{N}{lb}=W= 15568N\)

C).

\(W= mg\\15568= m*9.81\\m= \frac{15568}{9.81} \\m= 1586.95kg\)

Mass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of being counted in a bodily body, till the invention of the atom and particle physics. It changed into determined that distinctive atoms and one-of-a-kind elementary debris, theoretically with an identical amount of depend, have nevertheless specific masses. Mass in contemporary physics has a couple of definitions that are conceptually awesome, but physically equivalent. Mass can be experimentally defined as a measure of the frame's inertia, which means the resistance to acceleration (trade-off speed) when an internet pressure is implemented. The object's mass also determines the energy of its gravitational attraction to different bodies.

In physics, mass is not the same as weight, despite the fact that mass is frequently determined by measuring the object's weight through the use of a spring scale, in place of a balance scale evaluating it without delay with regarded loads. An item on the Moon might weigh less than it does on earth because of the decreased gravity, however, it would nonetheless have the same mass.

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The rise in temperature of the body as determined from the specific heat capacity, mass, and heat change of the body is 12.24 °C.

The rise in temperature of the body is determined from the specific heat capacity, mass, and heat change of the body.

The formula relating the temperature rise of the body, the specific heat capacity, mass, and heat change of the body is given below:

Heat change = mass * specific heat capacity * temperature rise

Temperature rise = Heat change / mass * specific heat capacity

Temperature rise = 3.6 * 10⁶ J / 84 kg * 3,500 J/kg/°C

Temepartaure rise = 12.24 °C

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Hi there!

22.

We can calculate the speed by first calculating the period of the stopper.

1 period = time taken for one revolution

10 rev/10 sec = 1 rev/sec

Since it takes 1 second for the stopper to make a complete circle, its velocity can be found using the equation for circumference:

\(v = \frac{2\pi r}{t} = \frac{2\pi (1)}{1} = \boxed{2\pi \approx 6.28 m/s}\)

23.

The centripetal force can be solved for using the following:

\(F_c = \frac{mv^2}{r}\)

m = mass (kg)

v = velocity (m/s)

r = radius (m)

Fc = Centripetal force (N)

Plug in the givens:

\(F_c = \frac{0.028(2\pi)^2}{1} = \boxed{1.105 N}\)

Answer: We get chemical energy from foods, which we use to run about, and move and talk  kinetic and sound energy  Chemical energies are stored in fuels which we burn to release thermal energy - this is one way of making electricity, see Electricity for more information



hope this helps

The force of static friction acting on the boy is 333 Newtons.

Hence, option (d) 333N is the correct answer.

Given the data in the question;

Force of static friction acting on the boy; \(F_s = \ ?\)

Friction is simply referred as the resistance an object experience when moving or trying to move over another object. It can either by dynamic or static.

Static friction is the resistance experienced by a body at rest.

Coefficient of friction is the measure of how easily a body moves in relation to the other.

Static friction is expressed as;

\(F_s = u_s * F_n\)

Where \(F_s\) is the normal force and \(u_s\) is the coefficient of static friction.

We substitute our given values into the equation above

\(F_s = u_s * F_n\\\\F_s = 0.68 * 490N\\\\F_s = 333.2N\\\\F_s = 333N\)

The force of static friction acting on the boy is 333 Newtons.

Hence, option (d) 333N is the correct answer.

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Here are two examples of personal biases that may impact the results of a personality test:

Social desirability bias: This bias refers to the tendency of test-takers to answer questions in a way that they believe will be viewed favorably by others, rather than providing honest answers.

Confirmation bias: This bias refers to the tendency of test-takers to seek out and interpret information in a way that confirms their existing beliefs or expectations. For example, a person who believes they are highly extroverted may unconsciously interpret ambiguous test questions in a way that supports this belief, leading to an inflated score on this trait.

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a) The cost of using the microwave oven for one hour is 6 cents.

b) The cost of using the microwave oven for 20 minutes in a day is 2 cents.

c) The cost of using the microwave oven for 20 minutes a day for a month of 30 days is 59 cents.

a) The microwave oven draws 0.8 kWh of electricity for one hour. The cost of electricity per kWh is 7.5 cents. Therefore, the cost of using the microwave oven for one hour can be calculated as follows:

Cost = 0.8 kWh x $0.075/kWh = $0.06

b) If the microwave oven is used for 20 minutes in a day, the energy consumed can be calculated as follows:

Energy consumed = Power x Time

Power = Energy consumed / Time

We know that the microwave oven draws 0.8 kWh of electricity for one hour. Therefore, the power can be calculated as:

Power = 0.8 kWh / 1 hour = 0.8 kW

The time for which the microwave is used is 20 minutes, or 0.33 hours. Therefore, the energy consumed can be calculated as:

Energy consumed = Power x Time = 0.8 kW x 0.33 hours = 0.264 kWh

The cost of using 0.264 kWh of electricity can be calculated as:

Cost = 0.264 kWh x $0.075/kWh = $0.02

c) If the microwave oven is used for 20 minutes a day for a month of 30 days, the energy consumed can be calculated as:

Energy consumed = Power x Time x Number of days

Power = Energy consumed / Time

Using the same values of power and time as in part b, the energy consumed for 30 days can be calculated as:

Energy consumed = 0.8 kW x 0.33 hours x 30 days = 7.92 kWh

The cost of using 7.92 kWh of electricity can be calculated as:

Cost = 7.92 kWh x $0.075/kWh = $0.59

In summary, the cost of using a microwave oven for electrical energy consumption depends on the power rating of the oven and the cost of electricity per kWh. By calculating the energy consumed and multiplying it by the cost per kWh, one can determine the cost of using the microwave for a particular period of time.

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In an exothermic reaction, more energy will be liberated from the old substance than the new substance will liberate to form its chemical bonds. Therefore, option B is correct.

An exothermic process can be described as a thermodynamic reaction that emits energy from the system to the surrounding in the form of heat, light, or sound.

In chemical reactions, the bond energy is converted into thermal energy. In exothermic reactions, the reaction takes place in the form of the kinetic energy of molecules. The electronic transition of electrons from one energy level to another leads light to be released.

The energy of the reactants is more than the energy of the products in the exothermic reaction. The energy liberated by reactants will be more than the energy required for the new bonds to be formed in the products.

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Answer:

75 cm/second.

Explanation:

Formula:

Walking speed = stride length / time per step

Walking speed = 90cm/time per step

                         = 90cm/1.2 seconds (a common estimate time per step)

                         = 75cm/second.

Answer:

For red light= 39.7°

Blue light 39.2°

Explanation:

Given that refractive index for red light is 1.33 and that of blue light is 1.342

So angle of refraction for red light will be

Sinစi/ (sinစ2) =( nw)r/ ni

Sin 58° x 1.000293/1.33. =( sinစ2)r

0.64= sinစ2r

Theta2r = 39.7°

For blue light

Sinစi/ (sinစ2) =( nw)b/ ni

Sin 58° x 1.000293/1.342 =( sinစ2)b

0.632= sinစ2r

Theta2b= 39.19°

Two vectors are parallel when the angle between them is either 0° (the vectors point in the same direction) or 180° (the vectors point in opposite directions).

In both mathematics and physics, the term "vector" is used informally to describe certain quantities (also known as "scalars") that cannot be described by a single number or by the constituent parts of some vector spaces.

Historically, vectors were introduced in geometry and physics (usually in mechanics) for things like displacements, forces, and velocity that have both a magnitude and a direction. Similar to how lengths, masses, and time are represented by real numbers, these quantities can be thought of as geometric vectors.

Tuples, which are finite sequences of numbers with a definite length, are also referred to as vectors in some settings.

Tuples and geometric vectors may both be added to and scaled, and the idea of a vector space is a result of these vector operations.

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Answer:

C

Explanation:

Answer:

that car got obliterated almost like the day my uncle said come with me

Explanation:

the outcome was not good