4,365 Answered Questions for the topic Science

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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11/21/20

What is the gauge pressure at this depth?
The depth of the Pacific Ocean in the Mariana Trench is 36,198 ft. What is the gauge pressure at this depth?
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11/21/20

Find the gauge pressure (in psi) at the bottom of a freshwater swimming pool that is 17.4 ft deep.
Find the gauge pressure (in psi) at the bottom of a freshwater swimming pool that is 17.4 ft deep.
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11/21/20

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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11/21/20

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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Science Physics

11/21/20

physics question
A downward-moving skydiver, who has just opened the parachute, is slowing down.The mass of the skydiver is 87 kg.The air resistance force is 1156 N.What is the net force, and in which... more
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Science Physics

11/21/20

physics question
A sledder has reached the bottom of a hill and is coasting to the right while slowing down along the loosely-packed snow. Ignore air resistance.The frictional force is -45 N.The sledder slows down... more
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11/21/20

Help me work out density please!!
If you dissolve 52.5 g of salt in 3.45 l of water, what is the density of that solution of salty water? In this particular example, assume that the total volume doesn’t change when salt is added to... more
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Science Chemistry

11/20/20

chemistry/thermodynamics/calorimetry
A 2.50 g sample of powdered zinc is added to 100.0 mL of a 2.00 M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/ºC . The... more
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11/20/20

calorimetry / thermodynamics problem

Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter,  26.5g of KNO3 is dissolved in 243 g of water at 23.00ºC.KNO3 (s) → K+ (aq) + NO3- (aq)The temperature... more
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Science Physics

11/20/20

the physics question confuses me
The cabin of a small freight elevator is secured to a motor by a cable and is moving upward with a constant speed. There is no contact between the cabin and the elevator shaft. Ignore air... more
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11/20/20

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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11/20/20

What is the average difference in the air pressure between the top and bottom of the wing?
The wing of an airplane has an average cross-sectional area of 11 m2 and experiences a lift force of 72,000 N. What is the average difference in the air pressure between the top and bottom of the... more
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Science Math Physics Algebra

11/20/20

Compute the speed of the air flowing into the room (in ft/s), assuming that we can treat the air as an incompressible fluid.
Air flows through a heating duct with a square cross-section with 6-inch sides at a speed of 5.9 ft/s. Just before reaching an outlet in the floor of a room, the duct widens to assume a square... more
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11/20/20

How much soybean oil must the bowl displace in order to float?
A metal bowl with a weight of 1.25 N is placed in a larger kitchen container filled with soybean oil. How much soybean oil must the bowl displace in order to float? For reference, the mass density... more
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Science Chemistry Physics

11/19/20

Physics Momentum and Impulse
What is the impulse of an object Whose momentum went from 300kg*m/s to 3000 kg*m/swhat is the net force on an object when the impulse is 198,000kg*m/s for 3600 seconds
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11/18/20

Angular momentum urgent help
a solid disk of mass m1 = 8.5 kg and radius R = 28 cm is rotating with a constant angular velocity of ω = 28 rad/sec. A thin rectangular rod with mass m2 = 3.5 kg and length L = 56 cm begins at... more
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