a physics student drops a rock from a 55m cliff. How long does it take to hit the ground?

Answer: [tex]36.86\°[/tex]

Explanation:

According to the described situation we have the following data:

Horizontal distance between lily pads: [tex]d=2.4 m[/tex]

Ferdinand's initial velocity: [tex]V_{o}=5 m/s[/tex]

Time it takes a jump: [tex]t=0.6 s[/tex]

We need to find the angle [tex]\theta[/tex] at which Ferdinand jumps.

In order to do this, we first have to find the horizontal component (or x-component) of this initial velocity. Since we are dealing with parabolic movement, where velocity has x-component and y-component, and in this case we will choose the x-component to find the angle:

[tex]V_{x}=\frac{d}{t}[/tex] (1)

[tex]V_{x}=\frac{2.4 m}{0.6 s}[/tex] (2)

[tex]V_{x}=4 m/s[/tex] (3)

On the other hand, the x-component of the velocity is expressed as:

[tex]V_{x}=V_{o}cos\theta[/tex] (4)

Substituting (3) in (4):

[tex]4 m/s=5 m/s cos\theta[/tex] (5)

Clearing [tex]\theta[/tex]:

[tex]\theta=cos^{-1} (\frac{4 m/s}{5 m/s})[/tex]

[tex]\theta=36.86\°[/tex] This is the angle at which Ferdinand the frog jumps between lily pads

To make each jump from one lily pad to the other successfully, Ferdinand the frog must make each of his jumps at an angle of approximately 37 degrees.

The question is asking for the angle at which Ferdinand the frog should jump to make it to the next lily pad. Given that the speed of the frog is 5 m/s and the distance to the next lily pad is 2.4 m, he takes 0.60 seconds to make each jump. Using time, speed, and distance, we can leverage the physics equations of motion to find the angle.

First, let's calculate the horizontal velocity (vx) using the formula, vx = d/t, which equals 2.4 m / 0.60 s = 4 m/s. The vertical velocity (vy) can be determined by using the Pythagorean theorem, v2 = vx2 + vy2, giving us vy = sqrt(v2 - vx2) which equals sqrt((5 m/s)2 - (4 m/s)2) = 3 m/s.

Finally, the jump angle (θ) can be found using the formula θ = atan(vy/vx), giving us θ = atan(3 m/s / 4 m/s) = 36.87 degrees. Therefore, Ferdinand the frog must make each of his jumps at an angle of approximately 37 degrees.

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The final speed of the boat is 24m/s. This is found by multiplying 1.5 by 10, then adding that number to the original speed, 9.

If you need more help, comment below and I'd be happy to assist.

Answer: having to push a rough and heavy box across the floor to move it

Explanation:

The Friction force is any force that is in opposite direction of the motion of an object or fluid due to the contact of this object or fluid with other bodies.

In this sense, there are different types of friction force thath are useful in different situations:

-The Static friction force prevents surfaces from slipping across each other. For example, the friction between your feet and the floor keeping you from slipping.

-The kinetic friction force as the force that helps the tires in a moving vehicle to slow down and stop when necessary.

However, if you want to push a heavy box across the floor to move it, the friction force will not be useful at all.

Answer:

having to push a rough and heavy box across the floor to move it

Explanation:

i recently did this question and got it right

Answer:

The average velocity is 50 km/h south

Explanation:

The average velocity of an object is its total displacement divided by

the total time taken.

That means it is the rate at which an object changes its position from

one place to another.

Average velocity is a vector quantity.

The SI unit is meters per second.

A bicycle that starts 100 km south and is 120 km south of town after

0.4 hour​.

The displacement = 120 - 100 = 20 km south

The time = 0.4 hour

The average velocity = [tex]\frac{D}{T}[/tex], where D is the displacement

and t is the time

The average velocity of the bicycle = [tex]\frac{20}{0.4}=50[/tex] km/h

The average velocity is 50 km/h south

If you want it in meter per second, change the kilometer to meter

and change the hour to seconds

1 km = 1000 m

1 hour = 60 × 60 = 3600 seconds

The average velocity of the bicycle = [tex]\frac{50(1000)}{3600}=13.89[/tex] m/s south

The substance is most likely classified as a compound, consisting of two or more different elements chemically bonded together in fixed proportions, as indicated by its chemical formula.

Given the chemical formula, the substance is most likely classified as a compound. A compound is a substance composed of two or more different elements chemically bonded together in fixed proportions. Chemical formulas represent compounds by indicating the types and numbers of atoms of each element present in the compound.

For example, water has the chemical formula H2O, indicating that it consists of two hydrogen atoms (H) bonded to one oxygen atom (O). Similarly, carbon dioxide has the chemical formula CO2, indicating that it consists of one carbon atom (C) bonded to two oxygen atoms (O).

In contrast, an atom refers to the smallest unit of a chemical element that retains the properties of that element. While chemical formulas also represent individual elements (e.g., O2 for oxygen gas), they primarily represent compounds.

The option "neither atom nor compound" doesn't accurately describe the classification based on a chemical formula. Chemical formulas specifically represent compounds, not individual atoms or substances that are neither atoms nor compounds.

Therefore, based on the chemical formula provided, the substance is most likely classified as a compound.

Answer:

C. 125

Explanation:

Given:

y₀ = h m

v₀ = 0 m/s

a = -10 m/s²

@ t − 1, y = 9/25 h m

@ t, y = 0 m

Find: h

Use constant acceleration equation:

y = y₀ + v₀ t + ½ at²

@ t:

0 = h + (0) (t) + ½ (-10) t²

0 = h − 5 t²

h = 5 t²

@ t − 1:

9/25 h = h + (0) (t − 1) + ½ (-10) (t − 1)²

9/25 h = h − 5 (t − 1)²

9/25 h = h − 5 (t² − 2t + 1)

9/25 h = h − 5 t² + 10 t − 5

0 = 16/25 h − 5 t² + 10 t − 5

Substitute:

0 = 16/25 (5 t²) − 5 t² + 10 t − 5

0 = 16/25 t² − t² + 2 t − 1

0 = -9/25 t² + 2 t − 1

0 = 9 t² − 50 t + 25

0 = (t − 5) (9t − 5)

t = 5/9 or 5

Since t > 1, t = 5.

Solving for h:

h = 5 t²

h = 125

The focus of community psychology is to improve the quality of one’s life through prevention and second order change.  

Explanation:

             Community psychology travels beyond an individual approach and integrates “social, cultural, environmental and international influences” to promote positive change. Additionally, it makes health and personal responsibility at the individual and system levels. It uses different psychological and external perspectives to address the attitudes and behavior of communities, their relationships and the people involved.  

             Community psychologists try to promote healthy and empowering groups and communities. They use concepts and knowledge from various disciplines, such as social, ecology, and intercultural psychology. Second-order change means paying attention to the system and structures that are involved in the problem to suit the human-environment good.  

The net force acting on this wheelbarrow is 250 N to the right.

In the given free body diagram, we observe four force vectors acting on the wheelbarrow. The downward force (F subscript g) is -800 N, representing the gravitational force pulling the wheelbarrow downward. The leftward force (F subscript f) is -400 N, likely due to friction opposing the direction of motion. The upward force (F subscript N) is 800 N, corresponding to the normal force supporting the wheelbarrow against gravity. Finally, the rightward force (F subscript t) is 250 N, indicating the applied force pulling the wheelbarrow to the right.

To determine the net force, we consider both horizontal and vertical components. In the horizontal direction, the rightward force (F subscript t) is opposed by the leftward force (F subscript f), resulting in a net force of 250 N - 400 N = -150 N. This negative sign indicates the direction is to the left. In the vertical direction, the downward force (F subscript g) is balanced by the upward force (F subscript N), yielding a net force of 800 N - 800 N = 0 N.

The overall net force is a vector sum of the horizontal and vertical components. The horizontal net force of -150 N to the left combines with the vertical net force of 0 N, resulting in a net force of -150 N overall, directed to the left. Therefore, the net force acting on the wheelbarrow is 150 N to the left.

Answer:

the objects' mass and distance between the objects

Explanation:

The force of gravity depends on the objects' mass (m₁ and m₂) and distance between the objects' centers of gravity (r), as described by Newton's law of gravitation:

F = G m₁ m₂ / r²

Answer:

mass , force , acceleration

Explanation:

edge 2021

The quantum of matter in an object is its mass.

An action that has the capability to change an object's state of stir is force.

The rate at which haste changes over time is acceleration.

The quantum of matter in an object is its mass. Mass is a measure of the volume of matter in an object.

An action that has the capability to change an object's state of stir is force. Force is defined as a drive or a pull on an object. It can beget an object to start moving, stop moving, speed up, decelerate down, or change direction.

The rate at which haste changes over time is acceleration. Acceleration is a measure of how snappily an object's haste changes. It can be positive, negative, or zero. However, it has positive acceleration, If an object's haste is increasing. However, it has negative acceleration, If its haste is dwindling. And if its haste isn't changing, it has zero acceleration.

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7

Explanation:

its obv 7 cuz each shell contains a certain mass

When drawing a Bohr diagram for a hydrogen atom in the 4th excited state, five energy shells must be drawn. This includes the atom's base state plus the four excited states.

In the context of a Bohr diagram for a hydrogen atom, when the atom is in the 4th excited state, you would draw five energy shells. The reason is that the base state of the atom is counted as the first energy level, or shell. So, for each excited state, you're essentially adding one more energy shell. Hence, for the 4th excited state, we count the base state plus the four excited states, which gives us a total of five energy shells.

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Melting tin and then cooling it into a mold is an example of reversible physical changes.

Explanation:

         When an object undergoes a change in size, state, or shape and not in their chemical compositions referred to as physical change. But chemical change occurs as a result of the change in substances composition. It also forms a new one by the combination/ breakage of one or more objects.

         In the case of making gold cube into two pieces, there is no possibility of getting the original state again even the physical change happens. Match burning and relighting and sodium plus chlorine forming table salt show chemical change. But in tin melting and cooling it to form mold is the physical change i.e changes in state(liquid to solid) and are reversible too.

Answer:

yes, melting tin and then cooling it into a mold

Explanation:

Which would show an example of how physical changes are reversible?

cutting a gold bar in two pieces and then putting the pieces next to each other

burning a match and then relighting it

melting tin and then cooling it into a mold

combining sodium and chlorine to make the new material of table salt

Answer:

906.5 cm

Explanation:

1 m = 100 cm

9.065 m = 100 cm * 9.065 m = 906.5 cm

1. 9.04 s

We can find the time taken for the steel ball to reach the ground by using the SUVAT equation:

[tex]d = ut + \frac{1}{2}gt^2[/tex]

where

d = 400 m is the distance

u = 0 is the initial velocity of the ball

g = 9.8 m/s^2 is the acceleration of gravity

t is the time

Solving the formula for t, we find the time taken for the ball to reach the ground:

[tex]t=\sqrt{\frac{2d}{g}}=\sqrt{\frac{2(400)}{9.8}}=9.04 s[/tex]

2. 88.6 m/s

The final velocity of the ball before it reaches the ground can be found by using the equation

v = u + gt

where

u is the initial velocity

g is the acceleration of gravity

t is the time

Here we have

u = 0

g = 9.8 m/s^2

Substituting the time of flight, t = 9.04 s, we find the final velocity:

[tex]v=0+(9.8)(9.04)=88.6 m/s[/tex]

Explanation:

Average acceleration is change in velocity over change in time.

a = Δv / Δt

a = (26.8 m/s − 0) / 6.2 s

a = 4.32 m/s²

Round as needed.

The average acceleration of the car, which is the rate of change in velocity over time, can be calculated by using the formula (final velocity - initial velocity) / time. Substituting the given values, the average acceleration of the car is 4.32 m/s².

In physics, acceleration is the rate of change of the velocity of an object with respect to time. It is a vector quantity, meaning it has both magnitude (amount) and direction.

According to the given question, the car's final speed is 26.8 m/s, the initial speed is 0 m/s, and the time taken to reach this speed is 6.2 sec.

Acceleration can be calculated using the formula: a = (v_f - v_i)/t, where a is the acceleration, v_f is the final velocity, v_i is the initial velocity, and t is the time.

Substituting the given values into the formula, we get: a = (26.8 m/s - 0 m/s) / 6.2 s = 4.32 m/s².

Therefore, the average acceleration of the car is 4.32 m/s².

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Answer:

The distance covered by the rocket after fuel ran out is [tex]3442.04 m[/tex]

Explanation:

Given that the rocket moves with an acceleration [tex]a=30m/s^2[/tex]

time [tex]t=5 s[/tex]

Since the rocket starts from rest initial velocity  [tex]u=0 s[/tex]

The distance it travelled within this time is given by  [tex]s=ut+ \frac{1}{2} at^2[/tex]                                                                                                  [tex]=0 \times 5+ \frac{1}{2} (30\times25)=375 m[/tex]

Velocity at this point is given by [tex]v=u+at[/tex]

[tex]v=0+30\times5=150m/s[/tex]

Given that at this height it runs out of fuel but travels further. Here final velocity [tex]v=0[/tex](maximum height), initial velocity[tex]u=150 m/s[/tex]  and time to zero velocity [tex]t=\frac{v}{g} = \frac{150}{9.8} =15.3 s.[/tex]

Thus it travels [tex]15.3 seconds[/tex] more after fuel running out. The distance covered during this period is given

[tex]s= ut+\frac{1}{2} gt^2=150 \times 15.3+1/2 \times9.8 \times 15.3^2=3442.04 m[/tex]

Answer: C. both visible and invisible

Explanation:

Stars not only emit light in the visible range of the electromagnetic spectrum (what our eyes can see), they also emit light that is "invisible" to our eyes, because we do not have the receptors to perceive those frequencies.

In this sense, among this invisible range is ultraviolet light and infrared, for example.

Therefore, among the proposed options, the correct one is C:

Both visible and invisible

Answer:

2

Explanation:

The second payment method will be highly profitable.

We have a person who agreed to hire you for 30days. For the mode of payment he presented two offers to you - either $1000 a day or one penny on the first day, two pennies on the second day and continue to double your daily pay each day up to day 30.

We have to investigate which option will be the most profitable for you.

Your monthly pay will be = $500 x 30 = $15000

According to the question -

You selected first method of payment.

Therefore -  $1000 a day for 30 days will be = $30000

You selected second method of payment.

Now -

For day 1 → $1

For day 2 → $2

For day 3 → $4

For day 4 → $8

For day 5 → $16

and so on.

We will get the following series (till n = 30)

1 + 2 + 4 + 8 + 16 + ......

Now - this sequence is a Geometric progression. The sum of n terms of a GP is given by -

[tex]$S_{n} = \frac{a(1-r^{n)} }{1-r} \;\;\;(r\neq 1)[/tex]

Substituting values, we get -

[tex]$S_{30} = \frac{1(1-2^{30)} }{1-2}[/tex]

On solving, we get -

S(30) = $1,073,741,823

Hence, the second payment method will be highly profitable.

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To find the rows that show a quadrupling pattern, look for the rows where the ratio of y to x remains constant. For example, if y is 4 when x is 1, then y should be 16 when x is 4. Two possible rows that show the pattern are row 1 with x=1 and y=4, and row 5 with x=2 and y=8.

In this question, we are looking for the rows in a data table where the value of x quadruples and the value of y also quadruples. Let's say the data table has x values in one column and their corresponding y values in the next column. To find the rows that show the desired pattern, we need to look for the rows where the ratio of y to x remains constant. For example, if y is 4 when x is 1, then y should be 16 when x is 4.

Here are two possible rows that show the pattern:

These are just examples, and depending on the actual data in the table, the rows showing the pattern may be different. Look for the rows where the ratio of y to x remains the same as x quadruples.

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Answer:

26 m/s

Explanation:

Answer:

Step on the gas pedal (increase in speed).

Step on the brakes (decrease in speed).

Turn the steering wheel (change in direction).

A bus driver can make the bus accelerate by pressing the gas pedal, releasing the brakes, or changing to a higher gear.

To make the bus accelerate, a bus driver can perform several actions. Three ways a bus driver can cause the bus to accelerate are:

1. Pressing down on the gas pedal, which increases the engine's output and propels the bus forward, increasing its speed.

2. Releasing the brakes, if they were partially engaged, reducing the force opposing the bus's forward motion and allowing it to speed up.

3. Changing the gear ratio, if applicable, by shifting to a higher gear in vehicles with a manual transmission, which can increase acceleration at different speeds.

Answer:

3. Mowing the lawn

Explanation:

Aerobic exercise is any type of cardiovascular conditioning.

Mowing the lawn is the only thing that is actively moving.

Answer:

3- MOWING THE LAWN

Explanation:

Mowing the lawn is an aerobic exercise because it is use on a daily basis. lawn mower is a machine that is used to cut grass surface.

Mowing the lawn help to burn calories and It is an exercise comparable to running.

Mowing the lawn by pushing it acts as a form of cardiovascular exercise which makes the heart and lungs work harder .

Mowing the lawn begin in the legs which build up strength and burn down calories from the constant movement and muscles in the lower back can also be worked by mowing the lawn.

Answer:

No' no its not

Explanation:

Oxygen in the atmosphere is a molecule because it contains molecular bonds. It is not a compound because it is made from atoms of only one element - oxygen.

No, 02 is not a compound. It represents the element oxygen (O) in its diatomic form. Diatomic molecules are formed when two atoms of the same element combine.

No, 02 is not a compound. It represents the element oxygen (O) in its diatomic form. Diatomic molecules are formed when two atoms of the same element combine. In the case of oxygen, two oxygen atoms combine to form O2. So, 02 represents a molecule, not a compound.

Answer:

Graphite is actually diamagnetic. Pyrolytic graphite is commonly used with neodymium magnet cube arrays to float above it due to the graphite becoming a magnet with the same polarity as the field facing it so it repels.

Explanation:

The statement that best describes gravitational force is as follows:

Thus, the correct option for this question is A.

Gravitational force may be defined as a phenomenon that involves the force of attraction that occurs between objects that have significant masses in the universe, especially the attraction of the earth's mass to bodies near its surface.

This specific type of force is always applied to objects that have mass. This force generally works by attracting the mass object towards its surface. It is a type of universal attractive force which is directly proportional to the product of the masses of two bodies.

But still it is considered as the weakest force that significantly operating in the nature.

Therefore, the correct option for this question is A.

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Answer:

Avoidance-Avoidance

Explanation:

You don't want either, but you have to pick one.  

Final answer:

The type of conflict that you would likely experience when having to choose between being unemployed and accepting a job you do not like is called an intrapersonal conflict.

Explanation:

The type of conflict that you would likely experience when having to choose between being unemployed and accepting a job you do not like is called an intrapersonal conflict. This type of conflict occurs within an individual when they have conflicting desires or goals. In this case, you may have the desire to be employed and financially stable, but also the desire to find a job that you enjoy and are passionate about.

Answer:

Explanation:

a=v-u/t

v=final velocity

u=initial velocity

u=0(when a body starts from rest the initial velocity is 0)

v=100m/s

t=8s

a=100-0/8

=12.5m/s²

Answer:

Option D) Both B and C

Explanation:

A textbook is dropped from the 2nd story stairs and falls freely. When an object falls freely, the only force acting on it is the force of gravity which results in a constant acceleration of g. So, whenever an object falls freely, its acceleration will be constant and equal to g(9.8 m/s²). Therefore, the acceleration of the textbook will remain constant. Option C is a correct option.

Since, the acceleration is constant and equal to 9.8 m/s², this implies that with every second, the velocity of the textbook will increase by 9.8 m/s. Since initial velocity is 0, the velocity after 1st second would be 9.8 m/s so that the acceleration is constant and equal to 9.8 m/s². Similar, after 1 sec the velocity is 9.8 m/s, so the velocity after 2 seconds would be 19.6 m/s so that the acceleration is constant and equal to 9.8 m/s². This way, after every second the velocity of the textbook, and every free fall object, increases by 9.8 m/s in ideal cases. So, option B is also correct.

Therefore, Both B and C are correct for the given scenario.

The textbook is in free fall motion because it is falling (in motion) due to gravity alone

The changes that will be observed are;

The velocity increases and the acceleration remains constant

The correct option is; Both B & C

Reason:

The type of motion of a text book dropped from the second story stairs is known as free fall motion

The kinematic equation of the motion is v = u + g·t

Where;

v = The velocity of the textbook

u = The initial velocity of the textbook = 0 m/s

t = The time after which it is dropped

g = The constant acceleration due to gravity ≈ 9.81 m/s²

Which gives;

v = g·t

Therefore, the velocity of the textbook increases as the time of free fall increases while the acceleration, g remains constant at 9.81 m/s²

Therefore, the correct option is both B & C

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Answer:

C and D

Explanation:

an object that is projected at an angle where gravity is the only force acting on the object

There always are when it says "check all that apply".

For this one, C and D are the ones that apply.