4,347 Answered Questions for the topic Science

07/13/22

Which ATPase is responsible for anterograde intracellular transport of vesicles?

The question is asking if you know what protein is responsible for moving a vesicle towards the cell membrane for exocytosis (an example of anterograde transport).
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07/12/22

Interesting tricky physics problem
A spacecraft (with velocity v) moves towards a cloud of cosmic dust of density p2. The dust that hit the spacecraft, sticks to it. Then the engine is turned on, so that the velocity of the... more
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07/09/22

Physics problem: rope sliding off the fence
A rope of length l<h is thrown over a fence of height h. Initially, the rope is in equilibrium position. At some moment, the equilibrium is lost and the rope slides off the fence. Find how much... more
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07/09/22

Two balls undergoing an elastic collision
Two balls of masses m1=0.3 kg and m2=0.2 kg are hanging on the same kind of thin threads that are attached to the same point. Keeping the thread tense, the first ball is raised to the height of H=7... more
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07/09/22

Interesting physics problem about a rope attached to an inclined plane
After many attempts, I don't really understand how to solve this physics problem:A rope of lenght l=20 cm is attached to an inclined plane (plane's angle of displacement is α = 30°). The other end... more
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07/09/22

Tricky physics problem about rod touching a box
A light rod of lenght l is attached to the ground A with a movable joint, which is in a perpendicular equilibrium position. On the top of the rod, a sphere of mass m is touching a box of mass M... more
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07/09/22

Physics problem: connected inclined planes
There are two inclined planes with the same curvature and the same mass M put on a horizontal surface. A small body of mass m is set to slide off (without friction) from height h on one plane.... more
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07/08/22

Hard physics problem about object attached to a thread
A thread of lenght l<AB is tied to the top (point A) of the stem AB. The other end of the thread is attached to an object. The thread is stretched out horizontally and then the object is... more
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07/01/22

When the size of an object were scaled up by a factor of 10 while retaining its present proportions, how would it affect the object's strength-to-weight ratio, and its surface area-to-volume ratio?
When the size of an object were scaled up by a factor of 10 while retaining its present proportions, how would it affect the object's strength-to-weight ratio, and its surface area-to-volume ratio?
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Science Physics

06/30/22

A solid sphere of mass m is attached to a light spring of force constant k so that it can roll without slipping along a horizontal surface. Calculate the period of oscillation made by sphere.
A solid sphere of mass m is attached to a light spring of force constant k so that it can roll without slipping along a horizontal surface. Calculate the period of oscillation made by sphere.
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Science Physics

06/30/22

Physics problem about two people sitting on a boat
A boat of lenght L and mass M is on still water. On the both ends of the boat two people are sitting with masses m1 and m2. How and what distance the boat will move after two people change their... more
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Science Physics

06/30/22

Sledge moving on a surface with friction
A sledge moving on a frictionless icy surface with v0=5 m/s, suddenly moves out onto the road. What is the distance the sledge will have moved on the road if the lenght of the slide is l=1 m, and... more
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Science Physics

06/30/22

Interesting physics problem about a bullet piercing through an object
A cube made of foam with mass of 100g is placed on a weak horizontal surface. The height of the cube is 10 cm. Then, a person shoots a bullet underneath the cube. The initial velocity of the bullet... more
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Science Physics

06/30/22

Friction on an icy surface
A human with mass of 70 kg is standing on an icy surface, then he tosses a 3 kg rock horizontally with velocity of v=8m/s. Find the distance the human will move after throwing the rock if the... more
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Science Physics

06/30/22

Physics problem about evaporation
The force of gravity acts on a raindrop of mass m0 making it fall down and slowly evaporate. Due to this, the mass of the raindrop gets smaller every second by ∆m. Calculate the force done by... more
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Science Physics

06/30/22

Inclined plane and pulley together
An object of mass m=3 kg is put on an inclined plane and tied along stationary pulley to a spring with coefficient k=80 N/m. The angle of the inclinde plane is 30 degrees, there are no friction... more
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Science Physics

06/30/22

Tricky physics problem about impulses
A projectile shot upwards, at the highest point explodes into three fragments. The first two fragments flied away with an angle of 90 degrees. The mass of the first fragment is m1 = 9 kg, velocity... more
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Science Physics

06/30/22

Physics: calculate the impulse
A molecule with initial velocity of v = 600 m/s strikes into a container wall. The angle between molecule's initial direction and the wall is α = 25°. The collision is absolutely elastic. Calculate... more
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Science Physics

06/30/22

Find the minimum amout of work
A brick (right rectangular prism) with density p and dimensions a×a×2a is resting on its side (horizontally), what minimum amount of work needs to be done to lift it up and place vertically.How to... more
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Science Math English Reading

06/28/22

How can I improve my studying skills and habits?
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06/26/22

About gravity my biggest question
I have a big question. According to Newton's law of Gravitation, every single atom attracts every other atom in the universe. The scientists have hypothesised a partical, gluon, to be responsible... more
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Science Chemistry Physics

06/24/22

What is the basic difference between a cloud and fog?
What is the basic difference between a cloud and fog? A. Fog is a cloud near the ground. B. Clouds form when air is cooled, whereas fog forms when air is heated. C. Clouds form when air is heated,... more
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Science Math Chemistry

06/20/22

How much water must be evaporated each hour to dissipate as much heat as a typical electric air conditioner?
In regions with dry climates, evaporative coolers are used to cool air. A typical electric air conditioner is rated 1.17 x 10^4 Btu/h. How much water must be evaporated each hour to dissipate as... more
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Science Physics

06/20/22

1b) An object 0.75 m tall is placed 3.4m in front of a convex mirror that has a focal length of -80cm. i) Calculate the image distance. ii) Calculate the image height.

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Science Chemistry

06/17/22

If you evaporated 250. mL of a 3.0 M solution of iron (II) nitrite, what mass of iron (II) nitrite would you recover?
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