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Physics

Karen Oconnor

A total Δν of 15 km/s is required to achieve an interplanetary mission. The proposed rocket has two stages. The first stage alone has a mass of 1000 tonnes and consists of 10 solid rocket boosters and a liquid rocket motor. The liquid rocket has a specific impulse of 300 s and a fuel mass flow rate of 1500 kg/s. The solid rocket boosters have a specific impulse of 250 s and a fuel mass flow rate of 200 kg/s. The first stage burn time is 1 minute. The first stage is jettisoned immediately after burn-out. The second stage has an initial mass of 150 tonnes. The second stage motor provides an effective exhaust velocity of 4 km/s and has a structural coefficient of 0.05. The rocket carries a 2 tonne payload. a. What is the jettisoned mass of the first stage?

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Physics

Guest

Spacecrafts have landed on the surface of which planet?

Saturn

Mars

Venus

Jupiter

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Physics

Karley Sweeney

Which geochemical cycle involves mantle convection

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Physics

Davion Matthews

Which type of eclipse would you expect to see when the moon passes directly through the moon and the sun?

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Physics

Kennedy Schroeder

Like magnetism, static electricity can attract and repel.

True

False

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Physics

Gracelyn

When a sound wave first enters the auricle, which part of the ear does it travel through on its way to the eardrum?

auditory nerve

cochlea

hammer

ear canal

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Physics

Jillian Farrell

Isla made a diagram to compare X-rays and radio waves. A venn diagram with two intersecting circles. The one on the left is labeled x-rays and the one on the right is labeled radio waves. There is an A in the one on the left, a C in the circle on the right and a B in the intersecting section. What should Isla write in the areas marked A, B, and C? A: Has a longer wavelength B: Can travel only through matter C: Has a higher frequency A: Has a higher frequency B: Can travel only through matter C: Has a longer wavelength A: Has a higher frequency B: Travels at the same speed C: Has a longer wavelength A: Has a longer wavelength B: Travels at the same speed C: Has a higher frequency

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Physics

Peyton Barber

What is the magnitude of electrostatic force of attraction between two alpha particles separated

at a distance 5.3x10-11m? (1 apha particle = change of proton)

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Physics

Camron Arnold

A block of material of volume 20cm³ and density of 2.5gcm³suspended from a

spring balance with half of the volume of the block immersed in water. What is the

reading of the spring balance?

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Physics

Adam

What are changes in temperature, duration of daylight, and the presence of a predator all examples of?

a. Behavior

c. Stimuli

b. Reflex

d. Instinct

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Physics

Leslie Harrison

A pendulum is hanging from a tower. The pendulum almost touches the ground and has a period of 18.0 s. What is the height of the tower?

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Physics

Volvo

Energy is lost as heat_

A. is destroyed

B. is absorbed

C. can still be used to work

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Physics

Kaydence Wang

What is the total charge of the uranium nucleus? (The neutral uranium atom has 92 electrons.) 1.47x10-17 c Computer's answer now shown above. You are correct. Previous Tries Your receipt no. is What is the magnitude of the force on an electron at a distance of 7.61 angstrom from the uranium nucleus?

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Physics

Amani Knapp

You are painting a house with a very steep roof. How do paint the sloping eaves safely?

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Physics

Sugar

A crazed physics student goes to the roof of the school 14.2 meters above the ground and drops a pumpkin straight down with an initial velocity of 0 m/s how long does it take for the pumpkin to hit the ground

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