A heavy rainstorm dumps 1.0 cm of rain on a city 7 km wide and 8 km long in a 2-h period.

part a) How many metric tons (1 metricton = 10³ kg) of water fell on the city? (1 cm3 of water has a mass of 1 gram = 10^-3 kg.)

Express your answer using one significant figure.

part b) How many gallons of water fell on the city? (1 gal = 3.785 L.)

Express your answer using one significant figure.

A basketball player is 6ft tall, the player was fouled and gets a free shot from the foul line. The player is 15ft away from the basketball net, and the basket is 10ft off the ground.

a)If the basketball player shoots the ball at an angle of 45 degrees, find the magnitude of the velocity needed to get the ball into the basket

b) If a basketball has a mass of 1kg estimate the force as a vector needed to make the basket

c) Why would the player want to shoot more slowly?

 A chain of many simple sugars is a:

Select one:

a. monosaccharide.

b. polysaccharide.

c. disaccharide.

d. nucleic acid. 

e. fatty acid.

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The correct answer is: polysaccharide.

Question 2

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2. What is/are the major role(s) of the phospholipid bilayer?

Select one:

a. is the source of ATP synthesis.

b. the formation of a barrier that is selectively permeable to lipid-soluble molecules only.

c. is the site of transcription and translation.

d. contains the genetic information required for cellular processes.

e. the formation of a barrier that is selectively permeable to lipid-soluble molecules and to provide a framework for membrane proteins. 

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The correct answer is: the formation of a barrier that is selectively permeable to lipid-soluble molecules and to provide a framework for membrane proteins. 

Question 3

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3. If a 25% sucrose solution is separated from a 15% sucrose solution by a membrane impermeable to sucrose, but permeable to water, in which direction will net movement of water occur?

Select one:

a. From the 15% sucrose solution to the 25% sucrose solution only.

b. From the 25% sucrose solution to the 15% sucrose solution only.

c. There will be no net movement of water in this case.

d. From the 15% sucrose solution to the 25% sucrose solution and from the 25% sucrose solution to the 15% sucrose solution.

e. None of the answers are correct.

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The correct answer is: From the 15% sucrose solution to the 25% sucrose solution only.

Question 4

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4. A neuron is exposed to a drug that causes the blockage of Na⁺ leak channels. How will this drug affect the resting membrane potential of the neuron? 
W. The resting membrane potential in this neuron would initially become more positive.
X. The resting membrane potential in this neuron would become around +60 mV.
Y. The resting membrane potential would return to normal following activity of the sodium-potassium pump.
Z. The resting membrane potential in this neuron would become more negative.

Select one:

a. if only W, X and Y are correct

b. if only W and Y are correct

c. if only X and Z are correct

d. if only Z is correct

e. if all are correct

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The correct answer is: if only Z is correct

Question 5

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5. Graded potentials may:
W. initiate an action potential.
X. depolarize the membrane to the threshold voltage.
Y. hyperpolarize the membrane.
Z. be called EPSPs or IPSPs.

Select one:

a.
 if only W, X and Y are correct

b. if only W and Y are correct

c. if only X and Z are correct

d. if only Z is correct

e. if all are correct

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The correct answer is: if all are correct

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6. A higher than normal secretion of the thyroid hormones thyroxine (T4) and tri-iodothyronine (T3) would cause increases in:
W. basal metabolic rate.
X. thyrotropin releasing hormone (TRH).
Y. basal rate of heat production.
Z. thyroid stimulating hormone (TSH).

Select one:

a. if only W, X and Y are correct

b. if only W and Y are correct

c. if only X and Z are correct

d. if only Z is correct

e. if all are correct

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The correct answer is: if only W and Y are correct

Question 7

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7. What is the primary mechanism for maintaining homeostasis?

Select one:

a. positive feedback

b. negative feedback

c. intrinsic control

d. extrinsic control

e. homeostatic control

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The correct answer is: negative feedback

Question 8

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8. Based on a 28-day cycle, which of the following occurs during days 6-14 of the menstrual cycle? 

Select one:

a. ovulation

b. menstruation

c. proliferative phase

d. secretory phase

e. luteal phase

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The correct answer is: proliferative phase will you help mi to explain all opetion ex w.x .y z from all question in short answer explanations

A 1 3 -kg mass is attached to a spring with stiffness 4 N/m. The damping constant for the system is 2 N-sec/m. The mass is displaced 1 2m to the left and given an initial velocity of 2 m/s to the right.

(a) Determine the equation of the motion of mass and express it in the form A e αt sin(βt + φ) by finding the constants A, α, β and φ in radians.

(b) Find the time t when the mass crosses the equilibrium position for the first time.

(c) Find the maximum displacement of the mass to the right.

A ball is thrown at an angle of θ₀ = 60° above the horizontal with an initial speed of v₀ = 11.5 m/s. What will be the direction of the ball's velocity after 0.62 sec? Submit the angle between the velocity and the horizontal (in degrees).

The angle, θ = _____ deg.

At what time will the velocity of the ball make an angle 12° relative to the horizontal?

The time, t = _____  

Assuming all other factors remain the same, if pulse repetition frequency increases discuss what will happen to the spatial pulse length

As frequency increases comment on what happens to back scatter

EXPERIMENT LINEAR AIR TRACK

1)In the experiment to investigate Newton's second law of motion by using linear air track,explain the function of each apparatus used,which are air track rail,blower,pressure tubr,gliders,flag,photogate,string and pulley.

2)Why do we need to measure the length of the flag to get the accelerationnand why do we use the formula a=2X/t2?.

3)Is there any friction force involves and suggest the ways to improve this experiment

A particle moves in the xy plane with constant acceleration. At t = 0 the particle is at r₁ = (4.0 m) + (3.0 m), with velocity ₁. At t = 3 s, the particle has moved to r₂ = (9 m) − (2.0 m) and its velocity has changed to v₂ = (5.0 m/s) − (6.0 m/s).

i. Find 1 = m/s

ii. What is the acceleration of the particle?

iii. What is the velocity of the particle as a function of time?

iv. What is the position vector of the particle as a function of time?

Consider E as function of the volume and temperature. Write down and expression for dE(V,T). Identify the partial derivatives in terms of known / measurable quantities if possible.

Question 4

The sea water (RD=1.03) level on one side of a sea lock is 3.5m high.

1. Determine the force on the 5m wide sea lock and also the location of this force from the bottom.
2. If a 300mm diameter hole is cut out and a cover plate bolted in place, determine the force on the cover plate and also the location to the center of the hole. The tops of the hole is 2.35m below the level of the sea water.

In your own words, describe the evolution of the Sun (from interstellar cloud to white dwarf). A H-R diagram must be drawn, and key aspects must be described in detail. You may write your answer in point form.

A 10.0 pF (picofarad - pico = 10^-12) is connected to a 12.0 V power supply. What is the energy stored in this capacitor?

mearth=5.9742×10^24kg
rearth=6.3781×10^6 m
mmoon=7.36×10^22kg
rmoon=1.7374×10^6m
death to moon=3.844×10^8m center to center
G=6.67428×10^-11

1700 kg satellite is orbiting the Earth in a circular orbit with an altitude of 1700 km
1) how much energy does it take to get it to this altitude
2)how much kinetic energy does it have once it has reached this altitude
3)what is the ratio of this change in potential energy to change in kinetic energy
4)what would this ratio be if the final altitude of the satellite was 4700 km
5)what would be this ratio if the final altitude was 3185 km?

Describe how to turn a negative photoresist into a positive.