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Grace Kim

Grace K.

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Chlorine has two isotopes, $^{35} \mathrm{Cl}$ and $^{37} \mathrm{Cl}: 75.77 \%$ of chlorine is $^{35} \mathrm{Cl}$, and $24.23 \%$ is $^{37} \mathrm{Cl}$. The atomic mass of $^{35} \mathrm{Cl}$ is 34.969 amu, and the atomic mass of $^{37} \mathrm{Cl}$ is 36.966 amu. What is the atomic weight of chlorine?

Chlorine has two isotopes, $^{35} \mathrm{Cl}$ and $^{37} \mathrm{Cl}: 75.77 \%$ of chlorine is $^{35} \mathrm{Cl}$, and $24.23 \%$ is $^{37} \mathrm{Cl}$. The atomic mass of $^{35} \mathrm{Cl}$ is 34.969 amu, and the atomic mass of $^{37} \mathrm{Cl}$ is 36.966 amu. What is the atomic weight of chlorine?

Organic Chemistry

If we let $x=2 \sin \theta,$ then $\int_{1}^{2} \frac{\sqrt{4}-x^{2}}{x} d x$ is equivalent to (A) $2 \int_{1}^{2} \frac{\cos ^{2} \theta}{\sin \theta} d \theta$ (B) $\int_{\pi / 6}^{\pi / 2} \frac{\cos \theta}{\sin \theta} d \theta$ (C) $2 \int_{\pi / 6}^{\pi / 2} \frac{\cos ^{2} \theta}{\sin \theta} d \theta$ (D) $\int_{1}^{2} \frac{\cos \theta}{\sin \theta} d \theta$
What fundamental force is the author referring to in this passage as a force between planets?

What fundamental force is the author referring to in this passage as a force between planets?

Let's Review Regents: Physics—Physical Setting

Earth's mass is approximately 81 times the mass of the Moon. If Earth exerts a gravitational force of magnitude $F$ on the Moon, the magnitude of the gravitational force of the Moon on Earth is (A) $F$ (B) $\frac{F}{81}$ (C) $9 F$ (D) $81 F$

Earth's mass is approximately 81 times the mass of the Moon. If Earth exerts a gravitational force of magnitude $F$ on the Moon, the magnitude of the gravitational force of the Moon on Earth is (A) $F$ (B) $\frac{F}{81}$ (C) $9 F$ (D) $81 F$

Let's Review Regents: Physics—Physical Setting

Questions asked

ANSWERED

Manisha Sarker verified

Numerade educator

integral (3x-1)/(3x) dx=?

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INSTANT ANSWER

Base your answer to the following question on the information below. A 1200-kilogram car moving at 12 meters per second collides with a 2300-kilogram car that is waiting at rest at a traffic light. After the collision, the cars lock together and slide. Eventually, the combined cars are brought to rest by the force of kinetic friction as the rubber tires slide across the dry, level, asphalt road surface. calculate the magnitude of the frictional force that brings the locked-together cars to rest.

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ANSWERED

Christopher Dzorkpata verified

Numerade educator

Before 0.5-kg ball is dropped from a third story window 20 m above the sidewalk. what is the speed of the ball just before it strikes the sidewalk? a. 5m/s b 10 m/s c. 14m/s d. 28m/s e. 200m/s

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Vysakh M verified

Numerade educator

within normal limits of use, if a 100 gram object stretches a spring 3 cm, a 200gram object will stretch the spring, in what cm? a. 3* sqrt 2 b. 3*2 c. 3^2 d. 3*2^2 e. 3^2 * 2^2

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An inclined plane 5 meters long has one end on the ground and the other end on a platform 3 meters high. A man weighing 650 newtons wishes to push a 900-newton object up this plane. The force of friction is 100 newton. The power expended by the man is pushing the object to the top of the plane in 3 seconds is a. 400 watts b. 800 watts c. 1070 watts d. 4500 watts e. 4500 joules

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ANSWERED

Ankur S verified

Numerade educator

An inclined plane 5 meters long has one end on the ground and the other end on a platform 3 meters high. A man weighing 650 newtons wishes to push a 900-newton object up this plane. The force of friction is 100 newton. What is the minimum force he must exert in newtons? a. 100 b. 540 c. 640 d. 900 e. 1000

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ANSWERED

Ankur S verified

Numerade educator

The 1,000-newton weight of a pile driver falls freely from rest; it drops 25 meters, strikes a steel beam, and drives it 3 centimeters into the ground. The speed of the weight just before hitting the beam is, in meters per second, approximately a. 0.25 b. 3 c. 25 d. 22 e. 64

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ANSWERED

Shalini Tyagi verified

Numerade educator

what is the rate law for 2A -> B+C

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Sima Sarker verified

Numerade educator

if 200.mL of 0.60M MgCl2(aq) is added to 400.mL of distilled water, what is the concentration of Mg2+ (aq) in the resulting solution a. 0.2M b. 0.3M c. 0.4M d. 0.6M

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ANSWERED

David Collins verified

Numerade educator

how many moles of ions are present in 250 ml of a 4.4m solution of sodium sulfate, Na2SO4?

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