Evanumber001

18 Questions
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Calculus Help

If a rock is thrown upward on the planet mars with the velocity of 10 m/s its height in meters t seconds later is given by y = 10t - 1.86t^2. Find the average velocity over the given time intervals.

a) [1,3]
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Evanumber001 Feb 6, 2022

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calculus

What is the half-life of a radioactive isotope if the activity of a sample drops from 6,272 cpm to 196 cpm in 29.0 min?

Evanumber001 Dec 8, 2021

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calc

What is the energy in eV of the electron of a hydrogen atom for the orbit designated n = 4?

Evanumber001 Dec 8, 2021

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calc

What is the energy in eV of the electron of a hydrogen atom for the orbit designated n = 3?

Evanumber001 Dec 8, 2021

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calc

What is the radius in nm of the electron orbit of a hydrogen atom for n = 2?

Evanumber001 Dec 8, 2021

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calc

What is the radius in nm of the electron orbit of a hydrogen atom for n = 1?

Evanumber001 Dec 8, 2021

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calc

Photons of a certain infrared light have an energy of 1.12 10-19 J.

(a) What is the frequency of this IR light?
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Evanumber001 Dec 8, 2021

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calc

Photons of a certain ultraviolet light have an energy of 6.68 10-19 J.

(a) What is the frequency of this UV light?
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Evanumber001 Dec 8, 2021

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phy sci

Which has more kinetic energy: a 0.0011-kg bullet traveling at 406 m/s or a 5.4 107-kg ocean liner traveling at 15 m/s (29 knots)?
the bullet has greater kinetic energy
the ocean read more ..

Evanumber001 Oct 29, 2021

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phy sci

What is the kinetic energy of a 22 kg dog that is running at a speed of 7.3 m/s (about 16 mi/h)?

Evanumber001 Oct 29, 2021

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phy sci

A 66 kg student traveling in a car with a constant velocity has a kinetic energy of 1.7 104 J. What is the speedometer reading of the car in km/h?

Evanumber001 Oct 29, 2021

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phy sci

(a) What is the kinetic energy in joules of a 1140-kg automobile traveling at 89 km/h?
(b) How much work would have to be done to bring a 1140-kg automobile traveling at 89 km/h to a stop?

Evanumber001 Oct 29, 2021

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How much work does gravity do on a 0.110-kg ball falling from a height of 30.0 m? (Neglect air resistance.)

How much work does gravity do on a 0.110-kg ball falling from a height of 30.0 m? (Neglect air resistance.)

Evanumber001 Oct 29, 2021

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phys sci

A man pushes a lawn mower on a level lawn with a force of 186 N. If 43% of the force is directed horizontally, how much work is done by the man in pushing the mower 7.2 m?

Answer in joules please read more ..

Evanumber001 Oct 29, 2021

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Physical Science

What is the volume of a piece of platinum (𝜌 = 22.6 g/cm3) that has a mass of 0.20 kg? (Enter your answer in cm3.)

Evanumber001 Oct 29, 2021

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maf

Two ice skaters stand together as illustrated in Figure (a) below. They "push off" and travel directly away from each other, the boy with a velocity of v = 0.470 m/s to the left. If the boy weighs 721 N and the girl read more ..

Evanumber001 Oct 7, 2021

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losing it on this question

A man pushes a lawn mower on a level lawn with a force of 186 N. If 43% of the force is directed horizontally, how much work is done by the man in pushing the mower 7.2 m?

If you could solve the question read more ..

Evanumber001 Oct 7, 2021