What does the law of conservation of momentum

The acceleration will be "3 mph/s".

According to the question,

Final velocity,

Initial velocity,

Time,

As we know the formula,

→ [tex]Acceleration =\frac{Final \ velocity-Initial \ velocity}{Time}[/tex]

By substituting the values, we get

→                       [tex]= \frac{45-15}{10}[/tex]

→                       [tex]= \frac{30}{10}[/tex]

→                       [tex]= 3 \ mph/s[/tex]  

Thus above answer is right.

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It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s

Explanation:

Given:

Acceleration, a = -17 ft/s²

Distance, s  = 175 ft

Final velocity, v = 0

Time, t = ?

Initial speed, u = ?

We know:

v² - u² = 2as

(0)² - (u)² = 2 X - 17 X 175

u² = 5950

u = 77.14 ft/s

To calculate time:

v = u + at

0 = 77.14 - 17 X t

17t = 77.14

t = 4.58 sec

Therefore, It takes 4.58 seconds for the car to stop and the initial speed of the car is 77.14 ft/s

After the driver of a car slams on the brakes, which causes the car to stop after traveling 175 ft with a slow down rate of 17 ft/s², we have:

a) The car stops after 4.54 s.

b) The car's initial speed is 77.14 ft/s.

We can calculate the time at which the car stops with the following kinematic equation:

[tex] v_{f} = v_{i} + at [/tex]   (1)

Where:                

t: is the time =?

[tex] v_{i}[/tex]: is the initial velocity

[tex] v_{f}[/tex]: is the final velocity = 0 (the car stops)

a: is the acceleration = -17 ft/s² (the minus sign is because the car is slowing down its speed)    

First, we need to find the initial velocity.

[tex]v_{i}^{2} = v_{f}^{2} - 2ad[/tex]

Where:    

d: is the distance traveled = 175 ft

Then, the initial velocity is:

[tex]v_{i} = \sqrt{v_{f}^{2} - 2ad} = \sqrt{-2(-17 ft/s^{2})175 ft} = 77.14 ft/s[/tex]  

Hence, the initial velocity is 77.14 ft/s.

Now, the time at which the car stops is (eq 1):

[tex] t = \frac{v_{f} - v_{i}}{a} = \frac{0 - 77.14 ft/s}{-17 ft/s^{2}} = 4.54 s [/tex]

Therefore, the car stops after 4.54 s.

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I hope it helps you!

Final answer:

Two forces are acting on the bicyclist: the 60 N drag force and the pedaling force. The magnitude of the net force is 186 N calculated using Newton's second law. The force generated by the bicyclist through pedaling is 246 N.

Explanation:

To determine the number of forces acting on the bicyclist, we must consider both the drag force and the force generated by the cyclist's pedaling. Two forces are acting on the bicyclist: the pedaling force she generates and the 60N drag force opposing her motion.

To find the magnitude of the net force, we use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). We know the mass (m) is 60 kg and the acceleration (a) is 3.1 m/s2, so the net force (Fnet) can be calculated as:

Fnet = m × a
Fnet = 60 kg × 3.1 m/s2
Fnet = 186 N

The pedaling force the bicyclist is generating can be found by adding the drag force to the net force since they are in opposite directions:

Fpedaling = Fnet + Fdrag
Fpedaling = 186 N + 60 N
Fpedaling = 246 N

Thus, the bicyclist generates a pedaling force of 246 Newtons.

Answer:

force=mass×acceleration

The boy and  the bike  accelerating at 5.875 m/s^2.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Given parameters:

Total mass of the boy and  the bike : m = 40 kg.

Net horizontal force = 235 N.

Now according to Newton's 2nd law of motion:

Force = mass × acceleration

⇒ acceleration = Force /mass

⇒ acceleration = 235/40 m/s^2

⇒ acceleration = 5.875 m/s^2.

Hence, they are accelerating at 5.875 m/s^2.

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Answer:

Force = m a

Explanation:

Force is the quantity that relates mass of an object with its accelerate.

Final answer:

The acceleration of an object is directly proportional to the force applied and inversely proportional to its mass, as described by Newton's second law of motion (F = ma). Therefore, a less massive object will accelerate more than a more massive one when subjected to the same force.

Explanation:

The relationship between an object's mass and its ability to accelerate is a fundamental concept in Physics. According to Newton's second law, the acceleration (a) of an object is directly proportional to the net force (F) applied to it and inversely proportional to its mass (m), which can be expressed with the formula F = ma. This means for the same applied force, an object with less mass will accelerate more than an object with greater mass. As mass increases, more force is required to achieve the same acceleration.

Experiencing Mass and Acceleration

Our daily experience supports this relationship. Pushing a bicycle, which has less mass, results in more readily noticeable acceleration compared to pushing a car, which has more mass. The force necessary to change the motion of the car is significantly higher due to its greater mass.

Certain conditions must be met when applying Newton's second law. The object's velocity should be well below the speed of light, the force must be the total force accounting for all significant factors, and the observation must be made in an inertial reference frame. Within these parameters, we can accurately predict the impact of mass on an object's acceleration in response to a given force.

Answer:

The days are longer than during winter

Explanation:

In the summer, days feel longer because the Sun rises earlier in the morning and sets later at night. When the North Pole of the Earth is tilted toward the Sun, we in the northern hemisphere receive more sunlight and it's summer. ... It is also the day that the Sun reaches its highest point in the sky.

Answer:

See the explanation below.

Explanation:

A rigid body is an ideal concept of a body that does not vary its shape or dimensions when subjected by external forces. In real life all bodies are deformed independent of the hardness or strength of the material, whether in very small values of millimeter. The hammer in this case is considered as a rigid body for practical cases of kinematics or Kinetics in physics and engineering studies.

Answer:

Yes they are in order

1. coriolis effect

2. eye of the storm

3. warm ocean water

hope that helps :)

Explanation:

The rotational movement within a hurricane primarily stems from the Earth's rotation and a blend of factors influencing the airflow dynamics within the storm system.

A hurricane, a subtype of tropical cyclones, emerges as a rotating, low-pressure weather system evolving over tropical or subtropical waters. These cyclones exhibit robust winds, heavy precipitation, and storm surges. They can materialize within the Atlantic, Pacific, and Indian Oceans.

The genesis of hurricanes involves the ascent of warm, moisture-laden air from the ocean, culminating in cloud formation. These clouds coalesce into a rotating system encircling a central low-pressure core. As this rotational pattern intensifies and becomes more structured, the storm gains strength. Once the sustained wind speeds reach 74 miles per hour, the system is classified as a hurricane.

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Answer:

It is a parallel connection

Explanation:

In parallel connection the

Cell is not easily used up because the cells share the total current generated together with all bulbs.

But a major problem is the bulbs must not be left together undisconnected to avoid exhaustion arising from short fall in the strength of one cell as this bounds to affect others

Answer:

parallel

Explanation:

Answer: B

The only difference between these different types of radiation is their wavelength or frequency

Explanation:

Answer:

The answer is B. frequency and D. wavelength for APX.

Explanation:

Answer:

B. Mechanical energy= 50J+30J=80J

Answer:

80J

Explanation:

Answer:

63 mph

Explanation:

252/4 is 63mi

Answer:

When the arrow is pulled back there is both elastic and gravitational potential energy in the arrow. When it is released the elastic potential transfers to kinetic energy and as the arrow moves closer towards the ground gravitational energy is tranferred into kinetic as well.

Answer:

elastic potential energy

Explanation: when the arrow reaches the top of its flight, it has zero kinetic energy and the initial elastic potential energy is now gravitational potential energy of the arrow.

Answer:

Vacuum. A sound vacuum was created, i believe.

Answer: 1.75m

Explanation:

Given that,

mass = 200 kg

height by which mass was raised = ?

Energy required = 3420J

Apply the formula for calculating energy,

Energy = mass x acceleration due to gravity (g) x height

Energy = mgh

3420J = 200kg x 9.8m/s^2 x height

3420J = 1960kgm/s^2 x height

Height = 3420J / 1960kgm/s^2

Height = 1.75m

Thus, the mass was raised 1.75 metres high

Answer:1.96m

Explanation:

work=3920J

mass=200kg

g=10m/s^2

Height=work/(mass x g)

Height=3920/(200 x 10)

Height=3920/2000

Height=1.96m

Answer:

6 km

Explanation:

speed of Aaron, v = 8 km/hr

speed of Sam, v' = 6 km/hr

time 15 min = 0.15 hr longer than the other

Let the distance covered by both of them is d.

Let the time taken by Aaron is t and the time taken by Sam is t + 0.25

use the formula of distance = speed x time

For Aaron:

d = 8 x t ..... (1)

For Sam:

d = 6 ( t + 0.25) ..... (2)

From (1) and (2)

8 x t = 6 (t + 0.25)

8 t = 6t + 1.5

2t = 1.5

t = 0.75 hour

So, the distance traveled by both is 8 x 0.75 = 6 km.

Answer:

1: mass

2:weight

3: gravity increases

4: it decreases

Hope this helps:)

Explanation:

Answer:

Mass, Weight, Strength Increases, and Weight decreases

Explanation:

Got them right on Edge

Answer: 60Hz

Explanation:

Given that

Speed of wave V= 54m/s

Wavelength ( λ) = 0.90 m

Frequency of wave F = ?

Recall that the frequency of a wave is the number of cycles the wave complete in one secon, and it is measured in hertz.

So, apply the formula

V = F λ

F = V/ λ

F = 54m/s / 0.90 m

F = 60Hz

Thus, the frequency of this wave is 60 Hertz

Answer:

do

Explanation:

Answer: All major slopes at risk of mass wasting could be identified and monitored.

Answer: 62.86 coulombs

Explanation:

Resistance (R) = 210Ω

Voltage of battery (V) = 110V

total amount of charge (Q) = ?

Time (T) = 2 minutes

The SI unit of time is seconds so convert 2 minutes to seconds

(If 1 minute = 60 seconds

2 minutes = 2 x 60 = 120 seconds)

To get the total charge, first get the current (I) flowing in the circuit by applying the formula V = IR

110V = I x 210Ω

I = 110V/210Ω

I = 0.524 Amps

Then, apply the formula

Charge = current x time

i.e Q = IT

Q = 0.524 Amps x 120 seconds

Q = 62.86 coulombs

Thus, 62.86 coulombs of charge passes through the circuit.

Final answer:

To calculate the total amount of charge that passes through a point in the circuit in 2 minutes, we first find the current using Ohm's Law and then multiply by the time in seconds. The result is a total charge of 62.856 coulombs.

Explanation:

Calculating Total Charge in a Circuit

To find the total amount of charge that passes through a point in a circuit, we need to calculate the current first and then use the relationship between charge, current, and time. According to Ohm's Law, the current I in a circuit is given by the voltage V across the resistor divided by the resistance R of the resistor. In this case, with a 110V battery and a 210Ω resistor, the current is I = V/R = 110V/210Ω. Once we have the current, we can calculate the charge Q that passes through a point by multiplying the current by the time in seconds.

First, calculate the current: I = 110V / 210Ω ≈ 0.5238 A.

Next, convert the time given in the question from minutes to seconds: 2 minutes is 2 x 60 = 120 seconds.

Finally, multiply the current by the time to find the total charge: Q = I x time = 0.5238 A x 120 s = 62.856 C.

Therefore, the total amount of charge that passes through a point in the circuit in 2 minutes is 62.856 coulombs.

1) 10.8 cm, shrunken

2) 19.7 cm

3) 8.8 cm

4) See explanation

Explanation:

1)

A mirror works on the principle of reflection: a ray of light coming from an object is reflected back by the mirror, producing an image of the object.

The position of the image can be found by using the mirror equation:

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where

f is the focal length of the mirror

p is the position of the object

q is the location of the image

In this problem:

f = 7 cm is the focal length of the mirror

p = 20 cm is the position of the object

So we can find q from the equation:

[tex]\frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{7}-\frac{1}{20}=0.0929\\q=\frac{1}{0.0929}=10.8 cm[/tex]

The sign of q is positive: this means the image is real.

The magnification of the image is given by

[tex]M=\frac{y'}{y}=-\frac{q}{p}[/tex]

where

y' is the size of the image

y is the size of the object

M is the magnification

Substituting,

[tex]M=-\frac{10.8}{20}=-0.54[/tex]

Which means that he image is shrunken, (because [tex]|M|<1[/tex]), so [tex]y'<y[/tex].

2)

A lens works on the principle of refraction: the rays of light coming from an object are refracted into the focal point of the lens, and they can produce an image of the object.

We can solve the problem by using the lens equation:

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where

f is the focal length of the length

p is the position of the object

q is the location of the image

In this problem we have:

q = 51.5 cm is the location of the image

p = 32 cm is the position of the object

Solving for f, we find the focal length:

[tex]\frac{1}{f}=\frac{1}{32}+\frac{1}{51.5}=0.051\\f=\frac{1}{0.051}=19.7 cm[/tex]

3)

In this problem, we know the following data:

[tex]f=+17 cm[/tex] is the focal length (for a converging lens, it is positive)

[tex]y=5.5 cm[/tex] is the height of the object

[tex]y'=13.8 cm[/tex] is the height of the image

[tex]q=-22 cm[/tex] is the location of the image (it is negative because the image is virtual)

From the magnification equation, we can find the position of the object:

[tex]\frac{y'}{y}=-\frac{q}{p}[/tex]

And solving for p, the position of the object, we find:

[tex]p=-\frac{qy}{y'}=-\frac{(-22)(5.5)}{13.8}=8.8 cm[/tex]

So, the object should be located 8.8 cm from the lens.

4)

The images produced by a lens or by a mirror can be of two types:

Answer:

Equivalent resistance: 2.73 Ω

Voltage: 120 V

Total current: 44 A

Explanation:

In the figure attached, the circuit is shown

The equivalent resistance (Rt) is calculated as follows:

1/Rt = 1/R1 + 1/R2 + 1/R3

where R1, R2 and R3 are the individual resistances. Replacing with R1 = 5 Ω, R2 = 10 Ω and R3 = 15 Ω, we get:

1/Rt = 1/5 + 1/10 + 1/15

1/Rt = 5.5/15

Rt = 15/5.5 = 2.73 Ω

From the picture, the voltage in the circuit is 120V

From Ohm's law:

It = V/Rt

where It is the total current, V is the voltage and Rt is the equivalent resistance

It = 120*5.5/15 = 44 A

Answer:

Equivalent resistance: 2.7

Explanation:

trust me

Answer: be alert for pedestrians near the bus.

Explanation: Due to road accidents many Governments around the world has adopted and put in place certain rules and regulations with regards to road safety, this is so to prevent the or reduce the chances of accidents happening.

Road safety rules are rules and guidelines put in place by Government in order to prevent road accidents and maintain a free flow of traffic. An example of such rules is 'be alert for pedestrians near the bus ' when approaching a local bus that is stopped.

What to do when you see a stopped local bus is;

Be alert for pedestrians near the bus.

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Answer:

Increase

Explanation:

The acceleration will increase more if all the friction were removed from ramp.

Acceleration is the rate of change of velocity with time.

Frictional force is a force that opposes motion of a body.

Answer:

If friction were removed from the ramp, the acceleration of the skateboarder will increase.

Explanation:

Answer:

B

Explanation:

Answer:b

Explanation:the water will not be hot nomore because of the cold water

Answer:

The 1kg will travel farther.

Explanation:

Because it is lighter

Explanation:

We know that F = ma

So given

Force (F) = 10N

Mass (m) = 1kg

Acceleration (a) = ?

We know

F = ma

10 = 1 * a

Therefore Acceleration = 10 m/s²

Answer:

10m/s2

Explanation:

Force = mass x acceleration

10 = 1 x a

Divide both sides by 1

10/1 = 1/1 x a

10 = a

a = 10m/s2