an object is shot straight upward from sea level with an initial velocity of 250 ft/sec.
a)assuming that gravity is the only force acting on the object, give an upper estimate for it's velocity after 5 seconds has elapsed. use g=32 ft/sec^2 for gravitational acceleration.
b) using delta t=1 sec, find a lower estimate for the height attained after 5 seconds. ...?

Answer:

6

Explanation:

The guy above is correct

Answer:

simple answer is D.

Explanation:

Answer:

9j-

Explanation:

Answer: false

Explanation:

Agility is the ability of a body to change position efficiently.

An example is a dancer who moves the body quickly while dancing.

It is also a combination of balance, coordination, speed, reflexes, strength and endurance.

It is useful to think of a photon as a packet of Energy.

According to Albert Einstein light is composed of pockets of energy that are called photons. A photon has an electromagnetic field, electromagnetic radiation, electromagnetic force, and lastly, it is massless.

While studying the physics of light they found that light act as a stream of particles and move in waves. it carries energy as well. To define such a particle which shows both characteristics like energy in waves and a bunch of particles they introduce a name photon to describe the light in a proper way.

Light is made of steam of particles that particles are called photons, which is massless which means it travels with light speed in space and vacuum.

Hence photons are packets of energy.

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Answer:

∝=0,4[tex]s^{-2}[/tex] (angular acceleration)

Explanation:

We give you the equation of the sum of all torques:

∑τ=I*∝

Then we replace the torques :

Final answer:

The efficiency of the heat engine is calculated as the work output (40 J) divided by the heat input (150 J), resulting in an efficiency of 26.67%.

Explanation:

The efficiency of a heat engine is calculated using the ratio of the work output to the heat input. In this case, the engine does 40 J of work and the heat input is 150 J. The formula to find efficiency (η) is:

η = Work output / Heat input

η = 40 J / 150 J = 0.2667

So, the efficiency is 0.2667, or 26.67% when expressed as a percentage.

The copper atoms are held together by a metallic bonding. The correct answer would be an option (A).

Among two or more metal atoms, metallic bonding is a form of chemical bonding that results from the attraction of the positively charged metal nuclei and their delocalized valence electrons. However, the contact involved has a distinct nature and is known as metallic bonding in compounds that exclusively include metal atoms.

Metallic bonding, as its name suggests, typically takes place in metals like copper. The copper atoms in a piece of copper metal are arranged in a certain way. These atoms are held together by their valence electrons, which are free to move throughout the metal and are drawn to the positive cores of copper.

Thus, the copper atoms are held together by a metallic bonding.

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The question seems incomplete, the missing options, as follows:

The copper atoms are held together by ____.

A. Metallic bonding

B. Ionic bonding

C. Covalent bonding

Final answer:

The work associated with compressing a gas from 5.64 L to 3.35 L at a constant pressure of 1.21 atm is 279.58 joules.

Explanation:

To calculate the quantity of work associated with the compression of a gas from 5.64 L to 3.35 L by a constant pressure of 1.21 atm, we use the formula for work done during a constant pressure process: W = -P ΔV, where W is the work, P is the pressure, and ΔV is the change in volume. First, we convert the pressure from atmospheres to pascals because the standard unit for work is joules, which requires pressure to be in pascals (1 atm = 101325 Pa).

Then we find the change in volume: ΔV = Vfinal - Vinitial = 3.35 L - 5.64 L = -2.29 L. We convert this volume from liters to cubic meters by using the conversion 1 L = 0.001 m3, so ΔV in cubic meters is -0.00229 m3. Finally, we calculate the work done: W = -(1.21 atm * 101325 Pa/atm) * (-0.00229 m3) = 279.58 J. Therefore, the work associated with the compression of the gas is 279.58 joules.

To find the distance the car will roll along the slope before coming to rest, we can use the kinematic equation. Substituting the given values for initial velocity, acceleration due to gravity, and angle of the slope, we can calculate the distance traveled.

To find the distance the car will roll along the slope before coming to rest, we can use the kinematic equation:

v² = u² + 2as

where v is the final velocity (0 m/s in this case), u is the initial velocity (6.5 m/s), a is the acceleration (-g*sinθ,-g*sin9°), and s is the distance traveled. Rearranging the equation, we get:

s = (v² - u²) / (2a)

Substituting the values, we can calculate the distance traveled along the slope using the given acceleration due to gravity and the angle of the slope.

Final answer:

To determine the distance the car will roll along the slope before being at rest and rolling back, we can use kinematic equations. The car will roll approximately 15.5 meters before being instantaneously at rest and starting to roll back.

Explanation:

To determine how far the car will roll along the slope before coming to rest and rolling back, we can use kinematic equations. The key here is to find the time it takes for the car to reach zero velocity, which will then allow us to calculate the distance traveled.

First, let's find the acceleration of the car along the slope. The component of gravity parallel to the slope is 9.81 m/s2 * sin(9°), which gives us an acceleration of 1.6 m/s2.

Using the kinematic equation, v2 = u2 + 2as, where v is the final velocity (which is zero), u is the initial velocity (6.5 m/s), a is the acceleration (-1.6 m/s2), and s is the distance along the slope, we can solve for s. Rearranging the equation, we get s = (v2 - u2) / (2a). Plugging in the values, we find that the car will roll approximately 15.5 meters along the slope before being instantaneously at rest and starting to roll back.

The rock's displacement is 5 meters.

The rock's displacement can be calculated by taking into account the initial height of the balcony and the maximum height reached by the rock. Since the rock was thrown straight upward, its initial velocity is positive and its final velocity is zero at the maximum height. The displacement is given by the difference between the final and initial positions, so it would be 10 m (the maximum height) minus 5 m (the height of the balcony), resulting in a displacement of 5 meters.

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Answer:

what are the choices

Explanation:

Answer

D) burning a candle

Explanation

When burning a candle no new substance is form.

We have both physical and chemical change occuring.

Physical part: Melting of the solid wax and evaporation of the liquid forms the physical change.

Chemical part: burning of the wax vapour forms the chemical change.

Explanation:

The velocity of an object is given by the rate of change of position as :

[tex]v=\dfrac{dx}{dt}[/tex]

where

[tex]\dfrac{dx}{dt}[/tex] is the rate of change of velocity

From the position time graph of an object, the velocity of an object can be calculated using the slope of the graph. From the attached figure it is clear that the velocity is given by :

[tex]m=\dfrac{x_2-x_1}{t_2-t_1}[/tex]

[tex]m=\dfrac{20-10}{2-1}[/tex]

m = 10

i.e.

Velocity, v = 10 m/s

Hence, to calculate the velocity of an object the slope of the position vs time graph should be calculated

Answer:

Explanation:

As per the law of Mass of Action, Rate of forward reaction is equal to the rate of reverse reaction.

In such condition,a system is stable and attains a phase known as dynamic equilibrium.

Consider an equation having some reactants and product to be on a balanced load or sea saw.

If stress is applied, the balance will be distributed and the sea-saw will bend towards the stress factor applied side.

The stress can be applied in different way :

By changing concentration

By changing temperature

By altering pressure or volume

The heat content  of the gallon is higher i just answered this on Odysseware and got it correct

Answer: Holly can calculate the density of the block for the given information.

Explanation:

For the given options:

Acceleration is defined as the rate of change of velocity with respect to time. S.I. unit of acceleration is [tex]m/s^2[/tex] The equation used to calculate acceleration is:

[tex]a=\frac{v}{t}[/tex]

Density of an object is defined as the ratio of its mass and volume. The chemical equation representing density of an object is:  

[tex]\text{Density of object}=\frac{\text{Mass of object}}{\text{Volume of object}}[/tex]

Force is defined as the push or pull on an object with some mass that causes change in its velocity.

It is also defined as the mass multiplied by the acceleration of the object.

Mathematically,

[tex]F=ma[/tex]

Velocity is defined as the rate of change of position with respect to time. The equation used to calculate velocity is:

[tex]v=\frac{d}{t}[/tex]

Hence, Holly can calculate the density of the block for the given information.

Final answer:

Damage to the nervous system, especially the spinal cord, interrupts communication between the brain and body, leading to paralysis. The inability of spinal nerves to regenerate makes spinal cord injuries particularly severe and difficult to treat. With around 10,000 cases annually in the U.S., seeking effective treatments remains a challenge.

Explanation:

Why does the damage in the nervous system cause paralysis of the body? Damage to the nervous system, particularly the spinal cord, can result in paralysis due to the interruption in the communication between the brain and other parts of the body. The spinal cord acts as an information superhighway, and when it is damaged, this can prevent the brain from sending and receiving messages to the body, leading to a loss of sensation and movement below the injury level.

Spinal cord injuries are particularly severe because most nerve tissues, including those in the spinal cord, are not capable of regeneration, leaving many people permanently paralyzed. In the United States alone, there are around 10,000 spinal cord injuries each year. The extent of paralysis depends on the injury's location along the spinal cord and whether the injury was complete.

For example, damage at the neck level can result in paralysis from the neck down, affecting all four limbs (quadriplegia), while damage lower down may cause paralysis of the legs (paraplegia). Despite ongoing research, including stem cell transplants and efforts to reduce post-injury inflammation, treating spinal cord injuries remains a significant challenge due to the inability of spinal nerves to regenerate effectively.

Answer:

A. because we change location as Earth orbits the sun

Explanation:

We have to remember that the universe is traveling and expanding and we are all traveling along with it, in this case the stars are expanding and traveling with the universe along with us, but the appearing on a different angle to us on different times of the year is because we orbit the sun, changing the angle at which we see the stars.

A 'right-moving' thunderstorm refers to storms that move to the right of the steering winds, often associated with severe weather patterns including supercells.

When a forecaster looks for "right-moving" thunderstorms when predicting severe weather, they refer to storms that exhibit a dominant motion to the right relative to the steering winds at their altitude, typically in the Northern Hemisphere. This movement can be associated with supercell thunderstorms, which are characterized by a deep, persistently rotating updraft. Due to the Coriolis effect, storms in the Northern Hemisphere are deflected to the right, and this deviation is even more pronounced in severe weather situations where supercell thunderstorms are more likely to produce tornadoes and other severe weather phenomena. Supercells are often right-moving because they tilt with height in such a way that their upper parts move more to the right due to wind shear, resulting in their rightward motion compared to other nearby storms. The severe thunderstorms associated with supercells are particularly hazardous due to their potential to produce high winds, large hail, and tornadoes.

It's important to note that the direction and movement of thunderstorms and related weather fronts have significant implications for weather forecasting. A right-moving storm in the Northern Hemisphere often indicates a storm that is growing in strength and has the potential to be dangerous. Recognizing these patterns helps meteorologists predict severe weather with greater accuracy and provide earlier warnings to the public.

Final answer:

Weather changes occur primarily due to heat exchange between the ocean and atmosphere, heat exchange between the sun and atmosphere, and incoming solar radiation.

Explanation:

Weather changes occur primarily because of heat exchange between the ocean and atmosphere, heat exchange between the sun and atmosphere, and incoming solar radiation.

Oceans have a significant effect on weather and climate because their high heat capacity acts as a temperature buffer. The ocean absorbs most of the radiant heat from the sun, and ocean currents help distribute this heat.

Additionally, weather changes are influenced by variations in solar energy reaching Earth and changes in the reflectivity of Earth's atmosphere and surface.

Final answer:

Weather changes occur primarily because of incoming solar radiation, which heats the Earth's surface and drives atmospheric circulation. Ocean currents also contribute by redistributing heat, while human-induced climate change affects long-term patterns.

Explanation:

Weather changes occur primarily because of incoming solar radiation, which is the most important factor influencing climate. This solar energy heats the Earth's surface, resulting in the temperature of the air above it. The uneven heating of different parts of Earth's surface leads to the formation of pressure gradients and associated wind patterns. Moreover, such heating drives evaporation and affects cloud development and precipitation.

Ocean currents also play a key role by redistributing heat from warmer to cooler areas due to the high heat capacity of water, moderating climates particularly near coastal regions. Additionally, the rotation of Earth and seasonal changes affect the sunlight distribution, further influencing weather patterns.

However, human activities, specifically the burning of fossil fuels, have an impact on the climate, intensifying the greenhouse effect and leading to climate change. These changes result in alterations to the Earth’s overall temperature, oceanic conditions, and the biogeochemical cycles, contributing to more extreme and unpredictable weather events. But for the daily weather changes, solar radiation and the redistribution of this energy by the atmosphere and oceans are the primary drivers.

Answer:

the light will take 40,000 years to get to earth :))

Explanation:

it was also right on the test gl! :33

The light will take 40,000 years to get to earth.

Light is a form of electromagnetic radiation that makes things visible or enables the human eye to see. It can also be described as radiation that is visible to the human eye. Light contains photons, which are little energy packets. Light never deviates from a straight course.

If a star is located 40,000 light years from Earth,we can you conclude about the light from the star takes 40,000 years to get to earth

The light will take 40,000 years to get to earth.

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