4,347 Answered Questions for the topic Science

11/12/20

What is the minimum speed that a thrown ball would need to just reach the ceiling?
The ceiling of an arena is 38 m above the floor. What is the minimum speed that a thrown ball would need to just reach the ceiling?
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11/12/20

Finding pH from new solution
1.00L buffer made with 1.02 M generic acid HA and its conjugate salt 0.9 M NaA has a pKa of 4.87. If you add 51.0 mL (0.051 L) of 0.456 M HNO3, what is the new pH?
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11/12/20

How fast must the tackle be going before the collision for their speed afterward to be zero?
A running back with a mass of 96 kg and a speed of 7 m/s collides with, and is held by, a 144-kg defensive tackle going in the opposite direction. How fast must the tackle be going before the... more
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11/12/20

What was the original speed of the clay (in m/s)?
A pitcher throws a 0.70 kg ball of clay at a 3.0 kg block of wood. The clay sticks to the wood on impact, and their joint velocity afterward is 1.1 m/s. What was the original speed of the clay (in... more
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11/12/20

How much energy (in J) is stored in the spring under this circumstance?
A 38 kg child uses a pogo stick to bounce up and down. The spring constant, k, of the toy equals 9,300 N/m.(a) By how much would the spring be compressed by the child if she simply balanced... more
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Science Chemistry

11/12/20

A solution of 7.50 g of a nonvolatile molecular compound in 22.6 g of water boils at 100.78°C. What is the molar mass of the solute? (kb = 0.52°C/m)

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Science Chemistry

11/12/20

How many grams of sodium hydroxide are needed to prepare 500.0 mL of a 1.50 M solution?

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Science Physics

11/12/20

Science Question.
Why can we multiply by 100 cm/1 m and not change the true value of the number? 
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11/11/20

 Find the net force on the runner using the alternate form of Newton's second law.
A runner with a mass of 85 kg accelerates from 0 to 6 m/s in 9 s. Find the net force on the runner using the alternate form of Newton's second law.
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11/11/20

The change in momentum is the car's momentum when traveling 20 m/s minus its momentum when going 0 m/s. (Enter the magnitude.)
Using the alternate form of Newton's second law, compute the force (in N) needed to accelerate a 1,240 kg car from 0 to 20 m/s in 16 s. The change in momentum is the car's momentum when... more
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11/11/20

Find the sprinter's linear momentum (in kg · m/s). (Enter the magnitude.)
A sprinter with a mass of 83 kg reaches a speed of 9 m/s during a race. Find the sprinter's linear momentum (in kg · m/s). (Enter the magnitude.)
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11/11/20

what factor does the amount of mechanical energy stored in the spring change?
A spring is stretched by an initial amount from its relaxed state. If the spring is then stretched by three times that amount from its relaxed state, by what factor does the amount of mechanical... more
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11/11/20

Compute how much kinetic energy was "lost" in this inelastic collision.
A 9,100-kg truck runs into the rear of a 1,000-kg car that was stationary. The truck and car are locked together after the collision and move with speed 8 m/s. Compute how much kinetic energy was... more
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11/11/20

What is its speed (in m/s)?
A loaded gun is dropped on a frozen lake. The gun fires, with the bullet going horizontally in one direction and the gun sliding on the ice in the other direction. The bullet's mass is 0.04 kg, and... more
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Science Medical

11/11/20

why can i push my stomach out 2 ways
i can push it out the normal way but i can also push in between my belly button and ribs out quite far. i could do this for as long as i could remember but i’m just wondering what it is.
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Science

11/10/20

What is F=G M1 times M2 over d2?
I need this today!!!
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Science Physics

11/10/20

physics question?
An object is projected upward with a 30° launch angle from the ground and an initial speed of 60 m/s. For how many seconds will it be in the air? How far will it travel horizontally? Assume it... more
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Science Physics

11/10/20

physics question
so... the answer is t=2.04 and y=20.40 but idk how to do this:An object is projected upward with a 30 degree launch angle and an initial speed of 40m/s. How long will it take for the object to... more
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11/10/20

Write the kinetic, potential and total energy of a baseball having a mass of 0.145kg held 10 meters above the ground.
Write the kinetic, potential and total energy of a baseball having a mass of 0.145kg held 10 meters above the ground. The baseball was released under the influence of gravity on Earth and... more
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Science English Essay

11/09/20

Ideas for essay tittle
Hi,I have been asked to create an essay and I want to write about sleeping sickness.I have the outline:what it is, how it spreads, how this affects public health and the current preventions.But I... more
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Science Biology

11/09/20

Which of these describes the similar functions of capsids and nuclear membranes?
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11/09/20

What does skeletal muscle innervation meaning ?
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Science Geology

11/08/20

Starting from a wall outlet, trace back the source of energy as far as you can (Hint: At some point, the energy in electricity comes from something else, and so on, and so on. )
Starting with a wall outlet, trace back the source of energy as far as you can (Hint: At some point, the energy in electricity comes from something else. There is an ultimate source of the energy!)
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11/08/20

What is the acceleration experienced by passengers on this ride in g's?
The Kingda Ka roller coaster in New Jersey is the world's tallest ride of its kind. As the passenger cars are launched from rest at the start, they are accelerated uniformly to a speed of 57... more
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11/08/20

How far does the jet travel during the 7 s?
A jet aircraft with a mass of 4,400 kg has an engine that exerts a force (thrust) equal to 60,200 N.(a) What is the jet's acceleration when it takes off? (Give the magnitude.)(b)What is the jet's... more
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