Why are airbags, helmets, and other safety devices important? Physics

Answer:

the rotation of the earth once on its axis

Answer:

16 m/s.

Explanation:

potential energy = kinetic energy.

mgh = ½mv².Cancelling m from both sides,

gh = ½ v².

9.8*13 = ½ v²

2(127.4) = v²

v² = 254.8

v = √254.8

v = 15.96 ~ 16m/s.

Answer:

v = 16.1 m/s

Explanation:

Answer:

the answer is B The shovel lifted

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Answer:D

Explanation:

The standard deviation of a set of data tell you how much each data point differs, on average, from the mean value of the set. The correct option is D.

A standard deviation is a measure of how far apart the data is from the mean. A low standard deviation indicates that data is clustered around the mean, whereas a high standard deviation indicates that data is more spread out.

When data is distributed, standard deviation is important because it aids in understanding the measurements. The higher the standard deviation, the more evenly distributed the data is.

To summarize continuous data, the standard deviation is used in conjunction with the mean.

Furthermore, like the mean, the standard deviation is normally only appropriate when the continuous data is not significantly skewed or has outliers.

Thus, the correct option is D.

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Answer:

The buoyant force pushing up is greater than the force of gravity pushing down, and you feel the unbalanced force pushing on your hand.

Explanation:

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Answer:

The buoyant force pushing up is greater than the force of gravity pushing down, and you feel the unbalanced force pushing on your hand.

Explanation:

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Have a nice day!!!!

Answer:

Three types of potential energy include: Elastic potential energy, which is the energy stored in something when you push, pull, or force it out of shape: think of rubber bands or springs. Chemical potential energy, which is the energy something stores because of its chemical makeup: batteries have this kind of energy.

Explanation:

Potential energy, kinetic energy, and gravitational potential energy are three types of potential energy.

Energy is the capacity to do work or create change. It exists in various forms, including kinetic (movement), potential (stored), thermal (heat), electrical, and chemical energy. Energy is a fundamental concept in physics and is vital for all processes in the universe, from powering machines to sustaining life and ecosystems.

Potential energy, kinetic energy, and gravitational potential energy are three types of potential energy. Potential energy is the energy an object has due to its position or condition, while kinetic energy is the energy an object possesses due to its motion. Gravitational potential energy is a specific type of potential energy that an object has due to its position relative to the Earth's surface.

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Answer:

a ave = ( v1x - v0x ) i/Δt  + v1y j/Δt

Explanation:

The acceleration of a body is the rate of change of the velocity of the  body

The correct equation and value for the average acceleration vector and magnitude of the acceleration of the car are as follows;

Part (a) The average acceleration vector is [tex]\overset \rightarrow a_{av} =\dfrac{(v_{1x} - v_{0x})}{\Delta t} }\mathbf{i} + \dfrac{v_{iy} }{\Delta t} \mathbf{j}[/tex]

Part (b) The magnitude of the cars acceleration is [tex]\mathbf{ 2.\overline{518} }[/tex] m/s²

The reason the above values are correct is as follows:

Question: The parts of the question that appears to be missing are;

Part (a); The vector expression for the average acceleration in the time periods

Part(b); Find the magnitude of the cars acceleration

Variables:

v₀ₓ = 31 m/s

v₁ₓ = 31 m/s

[tex]v_{1y}[/tex] = 6.8 m/s

Δt = 2.7 s

Solution:

Part (a) The average acceleration vector, [tex]\mathbf{\overset \rightarrow a_{av}}[/tex], is given as follows;

[tex]Average \ acceleration \ vector, \overset \rightarrow a_{av} = \mathbf{\dfrac{\overset \rightarrow v_2 - \overset \rightarrow v_1}{t_2 - t_1}} =\dfrac{\Delta \overset \rightarrow v}{\Delta t}[/tex]

The given parameters in the question;

v₀ = v₀ₓ i

v₁ = v₁ₓ i + [tex]v_{1y}[/tex]j

∴ v₁ - v₀ = v₁ₓ i + [tex]v_{1y}[/tex]j - v₀ₓ i

The average acceleration vector becomes;

[tex]\overset \rightarrow a_{av} = \mathbf{\dfrac{\overset \rightarrow v_1 - \overset \rightarrow v_0}{\Delta t}} =\dfrac{(v_{1x} - v_{0x})\mathbf{i} + v_{iy} \mathbf{j}}{\Delta t}[/tex]

Therefore;

[tex]\mathbf{The \ average \ acceleration \ vector} \overset \rightarrow a_{av} =\dfrac{(v_{1x} - v_{0x})}{\Delta t} }\mathbf{i} + \dfrac{v_{iy} }{\Delta t} \mathbf{j}[/tex]

Part (b) The magnitude of the car's acceleration is given by plugging values of the variables v₀ₓ, v₁ₓ, [tex]\mathbf{v_{1y}}[/tex], and Δt in the above equation as follows;

[tex]\overset \rightarrow a_{av} =\dfrac{(31 \, m/s - 31 \, m/s)\mathbf{i} + 6.8 \, m/s \mathbf{j}}{2.7 \, s} = 2.\overline{518} \ m/s^2 \ \mathbf{j}[/tex]

The magnitude of the cars acceleration, a = [tex]\sqrt {(2.\overline{518} \ m/s)^2 } = \mathbf{ 2.\overline{518} \ m/s^2}[/tex]

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Answer:

The average global temperatures has increased since 1880 due to the emission of toxic gases in the atmosphere.

Explanation:

The momentum of truck is 20790 kg m/s

Solution:

Given that we have to find the momentum of truck

From given, 1155 kg truck has a velocity of 18 m/s

Therefore,

Mass = 1155 kg

Velocity = 18 m/s

The momentum is given by formula:

[tex]p = m \times v[/tex]

Where, m is mass in kg and v is velocity in m/s

Substituting the values we get,

[tex]p = 1155 \times 18\\\\p = 20790[/tex]

Thus momentum of truck is 20790 kg m/s

Answer:

87.5 m/s

Explanation:

350m * 0.25s = 87.5 m/s

Answer:

11.2km

Explanation:

Using Pythagoras theorem

R² = 10² + 5²

R² = 100 + 25

R² = 125

R = √125

R = 11.2km

The sum of the vectors 10 km west and 5 km south results in a resultant vector with a magnitude of 11.18 km and a direction of 26.57 degrees south of west, calculated using vector addition and trigonometric functions.

To find the sum of the vectors mentioned in the question, we need to apply the principles of vector addition. The first vector is given as 10 km west, which we can represent as (-10, 0) in Cartesian coordinates assuming the west is the negative x-direction. Similarly, the second vector is 5 km south, which we can represent as (0, -5) since south is the negative y-direction.

The sum of the vectors is found by adding their respective components. Hence, we add the x-components and the y-components separately:

Therefore, the resultant vector from the sum of these two vectors is (-10 km, -5 km). To find the magnitude and direction of this resultant vector, we use the Pythagorean theorem and trigonometry. The magnitude (R) of the resultant vector is given by:

R = √((-10 km)² + (-5 km)²) = √(100 km² + 25 km²) = √(125 km²) = 11.18 km

The direction is found by calculating the angle to the negative x-axis (west) using the arctan function: θ = arctan(|y-component|/|x-component|) = arctan(5/10) = 26.57 degrees south of west.

The distance from the start point to the destination is 11.18 km, and the direction is 26.57 degrees south of west.

Answer:to transfer electric current from one point to another

Explanation:

To transfer electric current from one point to another

Answer:

To conduct electricity.

Explanation:

The purpose of conducting wires in a circuit is to conduct electricity. The wire conducts electricity by allowing current flow through it from one point to another in the circuit .

Explanation:

Let the initial height of the balloon is L .

The lower level is L - 83 , because it goes 83 m downwards

The upper limit is L + 83.7 , because it goes up by 83.7 m

Thus the inequality becomes

L-83 ≤ L ≤ L + 83.7

Answer:

on days when high particle levels are expected, take these extra steps to reduce pollution:

Explanation:

1) reduce the number of trips you take in your car.

2) reduce or eliminate fireplace and wood stove use.

3) avoid burning leaves, trash, and other materials.

4) avoid using gas-powered lawn and garden equipment.

Answer: A

Explanation: The answer is silicon

Answer: silicon

Explanation:

Explanation:

Let us assume , an Object is thrown with initial Velocity u m/s and angle of θ above the horizontal level. The horizontal and vertical velocities are (x,y)

vₓ = v₀cos θ

[tex]v_{y}[/tex] = v₀ sinθ

now, the time when the object reaches the maximum height can be calculated from

[tex]v_{y}[/tex] = v₀ sinθ - at₀ = 0

t₀ = v₀ sinθ/a

thus, the total time in air is two times higher ; t = 2t₀ = 2 (v₀ sinθ) /a

the maximum distance can be calculated from this equation

X = vₓ t= v₀ cos  θ x 2 (v₀ sinθ) /a

it implies x is inversely proportional to a.

we know the acceleration on the Moon is 1/6 th of Earth.the ratio between between maximal distance on the moon and on the earth is 6.

Answer:

A. Wheel barrow

can't rlly explain-

The correct answer to the question is B. automobile steering wheel, as it represents a wheel and axle system where the steering wheel turns the axle (steering column), steering the vehicle.

A wheel and axle is a simple machine where a wheel is attached to a central rod known as an axle. The combination is designed to amplify force and can be found in many tools and machines. In the context of the provided options, B. automobile steering wheel is the correct answer, as it exemplifies a wheel and axle system. The steering wheel serves as the wheel that, when turned, rotates the axle (steering column) which ultimately steers the vehicle.

Other examples provided, such as a wheelbarrow, jar lid, and pencil, do not fit the definition of a wheel and axle as accurately. The wheelbarrow indeed has a wheel, but the axle's function and setup differ from the wheel and axle mechanism. The jar lid is more similar to a screw, and a pencil lacks the rotational mechanics involved in a wheel and axle system.

Answer: the angles are equal

Explanation:

The frequency of the waves generated by a rope that vibrates every 0.5 seconds is 2 Hz, as frequency is the inverse of the period. Hence, the correct answer is B.

The frequency of a wave is defined as the number of cycles per second, and it is the inverse of the period (the time for one complete cycle). So, if a rope vibrates every 0.5 seconds, that means the period (T) is 0.5 seconds. To find the frequency (f), we use the formula f = 1/T. Therefore, the frequency of the waves is f = 1/0.5 s = 2 Hz.

Answer:

rain or thunder

Explanation:

a) To get the vertical component of the ball's velocity just  before it hits the floor, we will use the equation of motion expressed as:

[tex]v_y = u + gt[/tex]

where:

u is the initial velocity

g is the acceleration due to gravity

t is the time taken

Given the following:

Substitute into the formula as shown:

[tex]v_y=0+10(0.6)\\v_y=6.0m/s[/tex]

Hence the vertical component of the ball's velocity just  before it hits the floor is 6.0m/s

b) Since the ball rolls off a table with a horizontal velocity of 5 m/s, hence  the horizontal component of the ball's velocity  just before it hits the floor

is 5m/s

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The vertical component of the ball's velocity just before it hits the floor is 6 m/s and the horizontal component of the ball's velocity just before it hits the floor is 5 m/s.

a. The vertical component of the ball's velocity just before it hits the floor can be calculated using the formula v = gt, where g is the acceleration due to gravity and t is the time. Therefore, v = 10 m/s2 x 0.6 s = 6 m/s.

b. The horizontal component of the ball's velocity just before it hits the floor remains the same as the original horizontal velocity, which is 5 m/s. This is because in the absence of air resistance, there are no horizontal forces acting on the ball after it leaves the table, so its horizontal velocity remains constant.

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Answer:

Areas of equal pressure.

Explanation:

The line making a circle means equal pressure.

Final answer:

The lines around a low-pressure area on a weather map are isobars, indicating areas of equal pressure crucial for predicting weather conditions.

Explanation:

The lines making a circle around the low-pressure area indicate areas of equal pressure, also known as isobars. These isobars connect places with the same atmospheric pressure measurements, typically in millibars. On a weather map, isobars form almost circular shapes around low-pressure centers, like cyclones, and indicate areas where the pressure decreases towards the center.

Understanding these pressure patterns is essential for meteorologists to describe and predict weather, as they directly affect weather conditions. For instance, the approach of a low-pressure system often brings cloudiness, winds, and precipitation.

Answer:

Explanation:

The force required to submerge something underwater can be found from Archimedes principle:

FB=pwVg

Where FB is the buoyant force, pw is the density of water (1g/ml), V is volume of the water displaced, and g is gravity. The key here is V. The volume of water displaced by the cork is equal to the volume of cork. Therefore, the required force is

F=1 g/cm³ x 10 cm³ x 9.8 m/s²= 98 N

Answer:

1,634.1 W

Explanation:

Power = work / time

P = 41,505.4 J / 25.4 s

P = 1,634.1 W

The mechanical energy isn't conserved. Some energy is lost to friction.

Option A.

The mechanical energy is defined as the energy of a body which it achieves by virtue of its position and velocity. The mechanical energy are of two types - potential energy and kinetic energy. The potential energy is the energy of the body which it achieves by means of its relative position and is directly proportional to the height of the body from its relative plane. Whereas the kinetic energy of the body is achieved by virtue of its velocity and is directly proportional to the square of velocity of the body.

As the mountaineer is skiing down the slope of a mountain, the potential energy of the person is gradually changing into his kinetic energy. Had it been in an ideal situation, the potential energy lost would have been just equal to the kinetic energy gained by the person. But there's friction which opposes the speed of the body and reduces the velocity. Thus the kinetic energy will be lost to some extent and the energy won't be conserved.

the correct answer is B) The mechanical energy isn't conserved. Some energy is lost to friction.

Answer:

They are worn because they help increase the quality of the grip on the bat.

Explanation:

the chances of cathcing the ball

Answer:

68.1N

Explanation:

Check attachment

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A shallow slope on a phase-change graph indicates - A. a little temperature increase for a lot of heat.

To understand this, let's break down the concepts involved:

Latent Heat: When a substance undergoes a phase change (like melting or boiling), it absorbs or releases heat without changing temperature. This heat is known as latent heat.

Phase Changes: During a phase change, such as ice melting into water, the temperature of the ice remains at 0°C until it has completely melted. Only after the phase change is complete does the temperature of the water begin to increase.

Shallow Slope on Graph: In a graphical representation, the shallow slope during a phase change signifies that while a large amount of heat is added, the temperature remains constant until the phase change is completed. This reinforces the idea that energy is being used to break molecular bonds rather than increasing kinetic energy.

Answer:

For a positive point charge, the lines radiate outward. While, for a negative point charge, the lines converge inward.

Explanation:

The electric field produced by a single point charge has a radial shape and follows an inverse square law. The magnitude is given by

[tex]E=k\frac{q}{r^2}[/tex]

where

k is the Coulomb's constant

q is the magnitude of the charge

r is the distance from the charge

The direction of the field depends on the sign of the charge. In particular, we have:

This is due to the fact that the direction of the field shows the direction of the force that a positive test charge would experience in this field. Therefore, since a positive test charge would feel a repulsive force in the field produced by a positive charge, then the direction of the field is outward; on the other hand, a positive test charge would feel an attractive force in the field produced by a positive charge, therefore the direction of the field is inward.

Total cost of electric iron used for 24 hrs is 72000 tsh.

Explanation:

Given

Voltage, V = 340 V

Power, P = 1000 W  = 1 kW

Time, T = 24 hrs

Cost per unit = 3000 tsh /unit

Total cost, T = ?

We know,

The cost is calculated in kWh

Therefore,

Total Power consumed = 1 kW X 24 hrs

Total Power consumed = 24 kWh

Total cost = total power X cost per unit

Total cost = 24 kWh X 3000 tsh/unit

Total cost = 72000 tsh

Therefore, total cost of electric iron used for 24 hrs is 72000 tsh.