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Physics

River Love

13.00 cm + 2.56 mm + 0.0047 = cm? Solve problem with correct number of significant digits

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Physics

Juliet Moore

Form of energy that exhibits wavelength behavior as it travels through space. Example: Mircrowave rays, U. V. rays.

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Physics

Hugh Skinner

Which of the following is the primary medium for beach erosion? ice gravity wind water

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Physics

Guest

A 75-kg snowboarder has an initial velocity of 5.0 m/s at the top of a 28 ∘ incline. after sliding down the 110-m long incline (on which the coefficient of kinetic friction is μk = 0.18), the snowboarder has attained a velocity v. the snowboarder then slides along a flat surface (on which μk = 0.15) and comes to rest after a distance x. part a use newton's second law to find the snowboarder's acceleration while on the incline and while on the flat surface.

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Physics

Aliyah Richardson

How chemical displacement reactions differ from a chemical decomposition reaction? "

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Physics

DJ

A tortoise and hare start from rest and have a race. As the race begins, both accelerate forward. The hare accelerates uniformly at a rate of 0.8 m/s2 for 4.4 seconds. It then continues at a constant speed for 13.5 seconds, before getting tired and slowing down with constant acceleration coming to rest 61.0 meters from where it started. The tortoise accelerates uniformly for the entire distance, finally catching the hare just as the hare comes to a stop.

1. How fast is the hare going 2.2 seconds after it starts?

2. How fast is the hare going 15.1 seconds after it starts?

3. How far does the hare travel before it begins to slow down?

4. What is the acceleration of the hare once it begins to slow down?

5. What is the total time the hare is moving?

6. What is the acceleration of the tortoise?

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Physics

Barney

You drive a car for 2.2 h at 45 km/h, then for another 2.2 h at 60 km/h. what is your average velocity?

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Physics

Evan Lam

What is the mass of a 735-N weight on Earth?

A. 73.5 kg

B. 75.0 kg

C. 334.1 kg

D. 725.2 kg

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Physics

Bria Daniel

Why must you operate the exhaust blower before starting a boat's inboard gasoline engine?

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Physics

Susan Frank

you drive in a straight line at 20.0m/s for 10.0 min, then 30.0m/s for another 10.0 min. Find the average speed.

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Physics

Serenity Nash

Yeast produce offspring that usually have

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Physics

Elliott Velez

A current of 15 amps flows for 8.5 seconds, then the charge is?

123 J

1.829 J

0.54667 J

None of the other answers are correct

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Physics

Levy

Which biome is home to half of earth's species?

a. tropical rain forest

b. taiga

c. temperate deciduous forest

d. grassland

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Physics

Guest

Desiree has a scientific question that she wants to investigate. She has developed a hypothesis and method for her experiment. Which step of scientific inquiry should Desiree take next?

Desiree should present her findings to her teacher and classmates.

Desiree should collect data, which may support or refute her hypothesis.

Desiree should provide an explanation for her results.

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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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