##### What visible wavelengths of light are strongly reflected from a 390-nm-thick soap bubble?

A soap bubble is essentially a thin film of water surrounded by air. The colors you see in soap bubbles are produced by interference. What visible wavelengths of light are strongly reflected from a 390-nm-thick soap bubble? What color would such a soap bubble appear to be?

In: Physics

##### The jet transport B is flying north with a velocity

The jet transport $$B$$ is flying north with a velocity $$v_{\mathrm{B}}=600 \mathrm{~km} / \mathrm{h}$$ when a smaller aircraft $$A$$ passes underneath the transport headed in the $$60^{\circ}$$ direction shown. To passengers in $$B$$, however, $$A$$ appears to be flying sideways and moving east. Determine the actual velocity of $$A$$ and the velocity which $$A$$ appears to have relative to $$B$$.

In: Mechanical Engineering

##### A cylindrical beaker of height 0.100 m and negligible weight is filled to the brim with a fluid of density ρ = 890 kg/m3 . When the beaker is placed on a scale, its weight is measured to be 1.00 N

A cylindrical beaker of height 0.100 m and negligible weight is filled to the brim with a fluid of density ρ = 890 kg/m3 . When the beaker is placed on a scale, its weight is measured to be 1.00 N .(Figure 1)

A ball of density ρb = 5000 kg/m3 and volume V = 60.0 cm3 is then submerged in the fluid so that some of the fluid spills over the side of the beaker. The ball is held in place by a stiff rod of negligible volume and weight. Throughout the problem, assume the acceleration due to gravity is g = 9.81 m/s2 .

Part A

What is the weight Wb of the ball?

Part B

What is the reading W2 of the scale when the ball is held in this submerged position? Assume that none of the water that spills over stays on the scale.
Calculate your answer from the quantities given in the problem and express it numerically in newtons.

Part C

What is the force Fr applied to the ball by the rod? Take upward forces to be positive (e.g., if the force on the ball is downward, your answer should be negative).

Part D

What weight W3 does the scale now show?

In: Physics

##### A 30 nC charge experiences a 0.035 N electric force.

A 30 nC charge experiences a 0.035 N electric force. What is the magnitude of electric field at the position of this charge?

In: Computer Science

##### What is the magnitude of the electric force on charge A in the figure?

Part A
What is the magnitude of the electric force on charge A in the figure?
F=______N

Part B
What is the direction of the electric force on charge A in the figure? Choose best answer.

• (a)to the left
• (b)to the right
• (c)the force is zero

In: Physics

##### In (Figure 1), charge q2 experiences no net electric force. What is q1?

In (Figure 1), charge q2 experiences no net electric force. What is q1?

In: Physics

##### Two identical metal spheres A and B are connected by a plastic rod.

Two identical metal spheres A and B are connected by a plastic rod. Both are initially neutral. 4.0×1012 electrons are added to sphere A, then the connecting rod is removed. a)Afterward, what is the charge of A? b)Afterward, what is the charge of B?

In: Physics

##### Several wires of varying thickness are all made of the same material and all have the same length. If the wires are arranged in order of decreasing thickness, what can be said about the ordering of their resistance?

Several wires of varying thickness are all made of the same material and all have the same length. If the wires are arranged in order of decreasing thickness, what can be said about the ordering of their resistance?

• A. The wires will be arranged in order of increasing resistance.
• B. The wires will be arranged in order of decreasing resistance.
• C. The ordering of the resistances can not be determined because the resistivity is not given.
• D. The ordering of the resistances can not be determined because the length is not given.

In: Physics

##### according to table 1, which of the following materials is the poorest electrical conductor?

According to table 1, which of the following materials is the poorest electrical conductor?

• A. Nichrome
• B. Copper
• C. Aluminum
• D. Brass

In: Physics

##### According to Table 1, which of the following materials is the best electrical conductor?

According to Table 1, which of the following materials is the best electrical conductor?

• Brass
• Copper
• Aluminum
• Nichrome

In: Physics

##### Assuming each solution to be 0.10 M , rank the following aqueous solutions in order of decreasing pH.

Assuming each solution to be 0.10 M, rank the following aqueous solutions in order of decreasing pH.

Rank the solutions from the highest to lowest pH. To rank items as equivalent, overlap them

N2H2

Ba(OH)2

HOCL

NAOH

HCL

In: Chemistry

##### calculate the percent ionization of ha in a 0.10 m solution.

A certain weak acid, HA, has a Ka value of 6.7 X 10^-7.

Part A

Calculate the percent ionization of HA in a 0.10 M solution. Express your answer to two significant figures and include the appropriate units.

Part B

Calculate the percent ionization of HA in a 0.010 M solution.

Express your answer to two significant figures, and include the appropriate units.

In: Chemistry

##### The Gabriel synthesis transforms an alkyl halide into a primary amine via a two-step process.

The Gabriel synthesis transforms an alkyl halide into a primary amine via a two-step process. Follow the directions below to draw the initial mechanism and final products. Draw curved arrows to the next step. Draw the missing nonbonding electrons, charge and curved arrows. The first three steps are correct. I am unsure about how to complete the final step.

In: Chemistry

##### Draw the structure of the organic product of each reaction in the following two-step synthesis.

Draw the structure of the organic product of each reaction in the following two-step synthesis.

In: Chemistry

##### Draw the structures of the organic products in each reaction of the following two-step synthesis.

Draw the structures of the organic products in each reaction of the following two-step synthesis. (Hint: The nucleophilic amine attacks the electrophilic carbonyl carbon, and the resulting intermediate undergoes a proton shift and dehydration. Recall what is eliminated in a dehydration process. The second step is a reduction reaction; the reducing agent is NaBH3CN (or H2, metal catalyst). The aromatic ring is unaffected by these reagents. Look at the product of the first reaction and consider what can be easily reduced.)

In: Chemistry

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