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Evanumber001
Username
Evanumber001
Score
54
Membership
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Questions
17
Answers
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18 Questions
0 Answers
0
86
2
+54
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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141
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+54
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?
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Evanumber001
Dec 8, 2021
-2
100
0
+54
calc
What is the energy in eV of the electron of a hydrogen atom for the orbit designated n = 4?
Evanumber001
Dec 8, 2021
-2
86
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+54
calc
What is the energy in eV of the electron of a hydrogen atom for the orbit designated n = 3?
Evanumber001
Dec 8, 2021
-2
103
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+54
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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91
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+54
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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112
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+54
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
-1
104
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+54
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
0
138
2
+54
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
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Evanumber001
Oct 29, 2021
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129
1
+54
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)?
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Evanumber001
Oct 29, 2021
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133
1
+54
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?
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Evanumber001
Oct 29, 2021
0
125
1
+54
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?
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Evanumber001
Oct 29, 2021
0
142
4
+54
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.)
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Evanumber001
Oct 29, 2021
0
119
1
+54
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
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Evanumber001
Oct 29, 2021
0
122
1
+54
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.)
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Evanumber001
Oct 29, 2021
0
166
2
+54
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
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Evanumber001
Oct 7, 2021
0
135
1
+54
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 ..
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Evanumber001
Oct 7, 2021
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