4,347 Answered Questions for the topic Science

11/28/20

how much energy (in J) was made unavailable for useful work as a result?
An irreversible process takes place by which the entropy of the universe increases by 1.66 J/K. If the temperature of the environment in which the process occurred is 230 K, how much energy (in J)... more
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11/28/20

What is the engine's efficiency (in percent)?
As a gasoline engine is running, an amount of gasoline containing 10,200 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,400 J of work.(a)What is the engine's... more
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11/27/20

how much would the machinist have to lower the temperature (in °C) of the rod to make it fit the hole?
A machinist wishes to insert a steel rod with a diameter of 9 mm into a hole with a diameter of 8.998 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it... more
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Science Physics

11/27/20

Physics question
A box takes 350 N to start moving when the coefficient of static friction is 0.35. What is the mass of the box? m = 101.94 kgIdk how to do this prob
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11/26/20

What is the concentration and yield of the extract?
Undiluted extract: 1.71/5 dilution of extract: 0.82½ dilution of the 1/5 dilution: 0.49
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11/25/20

How much longer is it when it contains boiling water at 1 atm pressure?
An aluminum vat is 12 m long at room temperature (20°C). How much longer is it when it contains boiling water at 1 atm pressure?
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11/25/20

 At what temperature would the wing be 2 cm (0.02 m) shorter?
An aluminum wing on a passenger jet is 28 m long when its temperature is 15°C. At what temperature would the wing be 2 cm (0.02 m) shorter?
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11/25/20

What is its change in internal energy?
Air in a balloon does 57 J of work while absorbing 98 J of heat. What is its change in internal energy?
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11/25/20

What is the total mass (in kg) of water vapor in the air in the apartment?
An apartment has the dimensions 15 m by 8 m by 5 m. The temperature is 25°C, and the relative humidity is 57 percent. What is the total mass (in kg) of water vapor in the air in the apartment?
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11/25/20

What is the engine's efficiency (in percent)?
As a gasoline engine is running, an amount of gasoline containing 10,200 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,400 J of work.(a)What is the engine's... more
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Expert Answers •1

11/25/20

how much energy (in J) was made unavailable for useful work as a result?
An irreversible process takes place by which the entropy of the universe increases by 1.66 J/K. If the temperature of the environment in which the process occurred is 230 K, how much energy (in J)... more
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Expert Answers •1

11/25/20

how much would the machinist have to lower the temperature (in °C) of the rod to make it fit the hole?
A machinist wishes to insert a steel rod with a diameter of 9 mm into a hole with a diameter of 8.998 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it... more
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Expert Answers •1
Science Math Physics

11/25/20

A 3 kg block is resting on a ramp inclined at 20 degrees above the horizontal. What is the magnitude of the normal force acting on the block?
A 3 kg block is resting on a ramp inclined at 20 degrees above the horizontal. What is the magnitude of the normal force acting on the block? Report your answer to the nearest whole number.
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Science Math Physics

11/25/20

In the drawing, the box is being pulled up the ramp at a constant velocity. The ramp's angle is 30 degrees.
In the drawing, the box is being pulled up the ramp at a constant velocity. The ramp's angle is 30 degrees.A. How does the force applied parallel to the ramp compare to the force of friction?B. If... more
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Science Math Physics

11/25/20

A 3 kg block is resting on a ramp inclined at 20 degrees above the horizontal. What is the magnitude of the normal force acting on the block?
A 3 kg block is resting on a ramp inclined at 20 degrees above the horizontal. What is the magnitude of the normal force acting on the block?
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Science

11/23/20

parallel circuit is an electric with only one path for an electric current to flow
it is true or false?
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Science Physics

11/23/20

physics question
A boy pushes a 25.6 kg lawnmower making it go forward at a constant velocity. The handle of the lawn mower makes an angle of Θ = 22.0° below the horizontal. The boy pushes on the handle with a... more
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Science Physics

11/23/20

physics question
An 87 kg skier enters the bottom of a 3.12 m Ski Jump at 7.0 m/s. Assuming no friction on the jump: a) What is the net force on the skier while going up the 38° Jump? Ans: -525. N b) What is the... more
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Science Chemistry

11/22/20

A 25.00 mL sample of 0.2500 M sulfuric acid is titrated with 0.5000 M sodium hydroxide solution. What volume of sodium hydroxide solution is required?
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Science Chemistry

11/22/20

What is the molarity of a hydrochloric acid (HCl) solution if 20.0 mL of 0.0952 M sodium hydroxide (NaOH) is needed to neutralize 10.5 mL of the acid solution?
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11/22/20

How far below the surface of the water is the boat's bottom when it is floating in water?
A boat (with a flat bottom) and its cargo weigh 5,600 N. The area of the boat's bottom is 9 m2. How far below the surface of the water is the boat's bottom when it is floating in water?
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11/22/20

Assume the helium and air to be at 0°C and 1 atm.
A modern-day zeppelin holds 9,280 m3 of helium. Compute its maximum payload at sea level. (Assume the helium and air to be at 0°C and 1 atm.)
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11/22/20

What is the mass of the helium (in kg)?
A large balloon used to sample the upper atmosphere is filled with 335 m3 of helium. What is the mass of the helium (in kg)?
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11/22/20

What volume did the hydrogen occupy?
The total mass of the hydrogen gas in the Hindenburg zeppelin was 18,000 kg. What volume did the hydrogen occupy? (Assume that the temperature of the hydrogen was 0°C and that it was at a pressure... more
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11/21/20

What is the buoyant force exerted on it by the air?
An empty storage tank has a volume of 8,000 ft3. What is the buoyant force exerted on it by the air? (Assume the air is at 0°C and 1 atm.)
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