taupebee519

A 1.33kg block is sitting on a table. The block and table have a coefficient of static friction between themselves of 0.85; and a coefficient of kinetic friction of 0.59. A string is tied to the block and passes over a frictionless and massless pulley. A mass is then hung from the string.
a) How much mass can hang from the string before the block begins to slide?
b) If 20% extra mass is hung from the string, what would be the acceleration of the block?

The light passed from air into another medium at 36.0 degrees from the normal. If the angle of refraction is 28.0 degrees, what is the index of refraction of the new medium?

A rocket fires two engines simultaneously. One produces a thrust of 660 N directly forward while the other gives a thrust of 473 Nat an angle 15.6 ∘ above the forward direction.

A.Find the magnitude of the resultant force which these engines exert on the rocket.

B.Find the deviation of the direction (relative to the forward direction) of the resultant force which these engines exert on the rocket.

What is the ratio of the sunlight intensity reaching Pluto comparedwith the sunlight intensity reaching Earth? (On average, Pluto is39 times as far from the Sun as is Earth.)

The heaviest invertebrate is the giant squid, which is estimated to have a weight of about 0.20 tons spread out over its length of 30 feet. What is its weight in newtons?

The drawing shows a triple jump on a checkerboard, starting at the centre of square A and ending in the centre of square B. Each side of the square measures 3.71 cm. What is the magnitude of the displacement of the coloured checker during the triple jump?

A ball is thrown vertically upward. What are its velocity and acceleration when it reaches its maximum altitude? What is its acceleration just before it hits the ground?

Why is the band-gap of the solar cell so important in determining the efficiency of the cell?

What is the difference between infiltration and insolation?

A  Incompressible box is completely submerged in a fluid. What volume of fluid is displaced by the box if the fluid is...

a.) ...air?

The density of air is   

________  

b.) ...mercury? The density of mercury is  
________  

c.) ...helium? The density of helium is  
_______  

d.) ...water? The density of water is  
______  

A rocket is projected upward from the earth's surface  With an initial speed  That carries it to a distance  From the centre of the earth. What is the launch speed  

Assume that air friction can be ignored.

Where does the majority of the focusing in the human eye occur?
A. Air - cornea interface
B. Cornea - aqueous humour interface
C. Aqueous humour - lens interface
D. Lens - vitreous humour interface

Two astronauts, one of mass 60 kg and the other 80 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 12 m?

A child sits on a rotating merry-go-round, 2.1 m from its center. If the speed of the child is 2.2 m/s, what is the minimum coefficient of static friction between the child and the merry-go-round that will prevent the child from slipping?

A football being kicked to the right at an angle of 30° to the ground with a speed of 15m/s. Calculate the maximum height.

 At graduation, a student throws their cap Vertically with a velocity of 15 m/s. If someone standing outside the fence can only see above 10 m, will they see the Cap the air ?

The force between two charges is 2.0 N. If one charge is doubled and moved twice as far away, then what is the new force? How would i show it mathematically?

Problem 1
A sprinter running a 100 meter race starts at rest, accelerates at constant acceleration with
magnitude A for 2 seconds, and then runs at constant speed until the end.
a) Find the position (relative to the start position) and speed of the runner at the end of the 2
seconds in terms of A.
b) Assume that the runner takes a total of 10 seconds to run the 100 meters. Find the value of
the acceleration A. You can leave your answer in terms of a fraction but clearly indicate the
units.

What are the action and reaction forces?

A small cork with an excess charge of  Is placed 0.18 m from another cork, which carries a charge of What is the magnitude of the electric force

between the corks?

The Coulomb constant is

Answer in units of N

What is the main parameter for characterizing NPN or PNP bipolar transistors?

Help please

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 99 kg. The mass of the rock is 0.28 kg. Initially the wagon is rolling forward at a speed of 0.45 m/s. Then the person throws the rock with a speed of 16 m/s. Both speeds are relative to the ground. Find the speed of the wagon after the rock is thrown (a) directly forward in one case and (b) directly backward in another.

A certain force moves a 4kg box from rest to a velocity of 6m/s in 3 seconds. If the coefficient of friction between the box and floor is 0.05, what is the magnitude of the force?

Vector A has a magnitude of 23 units and vector B has a magnitude of 37 units. If A + B = R; What is the LEAST possible magnitude for R?

In this case, how would A & B be oriented with respect to each other?

A. Parallel to each other.

B.Anti-parallel to each other.

C.Perpendicular to each other,

D.45 degrees apart.

E.Impossible to determine

Need some help with these questions please, step by step and detailed with some explanations if possible. thank you for your time and work ^_^ appreciated

A car drives straight off the edge of a cliff that is 58 m high. The police at the scene of the accident note that the point of impact is 0.136 km from the base of the cliff. How long did it take to hit the ground?

Pilots of high-performance fighter planes can be subjected to large centripetal accelerations during high-speed turns. Because of these accelerations, the pilots are subjected to forces that can be much greater than their body weight, leading to an accumulation of blood in the abdomen and legs. As a result, the brain becomes starved for blood, and the pilot can lose consciousness ("blackout"). The pilots wear "anti-G suits" to help keep the blood from draining out of the brain. To appreciate the forces that a fighter pilot must endure, consider the magnitude of the normal force that the pilot's seat exerts on him at the bottom of a dive. The plane is travelling at 265 m/s on a vertical circle of radius of 633 m. Determine the ratio of the normal force to the magnitude of the pilot's weight. For comparison, note that black-out can occur for ratios as small as 2; if the pilot is not wearing an anti-G suit.

a) What potential difference must an electron accelerate through from rest in order to achieve a speed of m/s?

b) A potential difference of V accelerates an electron from rest. What is the resulting speed of the electron?

An electron travelling horizontally at a velocity of m/s to the right enters into an electric field of N/C between two horizontal, parallel plates that are separated by 8.00 cm and are 14.0 cm long. Assuming the electron enters next to the negetive plate, calculate the vertical displacement of the electron as it travels between the plates.

what is the electric field strength 1.00 cm from a positively charged plate if the parallel plates are 5.00 cm apart and the potential difference between the plates is   V?

*Please write this out in formula, not in the script it's hard to understand when things are not clearly detailed. thank you *

A cylinder of height h=10m and diameter D=2.00m contains water vapour in the form of numerous floating spherical droplets of water. The number density of water droplets in the cylinder is The radius of each water droplet is  

A)How many droplets are in the cylinder?

B) If the mass density of water is What is the total mass of the water in the cylinder?
 

A police car stopped at a set of lights is passed by a speeding car travelling at 100.0 km/h. If the police car can accelerate at Find the time required for the police car to catch the speeding car.

Calculate the wavelength of the third line in the Paschen series.

1. At rest, a uranium atom U238 decays into an alpha particle and a thorium atom Th234.  Radioactive decay is like an elastic collision run backwards; the particles begin stuck together and end by flying apart.  In this process,  energy is liberated.  The mass of an alpha particle is  And the mass of thorium is What is the momentum of the alpha particle after the decay?

I need help with ray tracing with convex, concave, and plane mirrors.

This unit is on forces and Newton’s law, I need the answers to be answered because it wasn’t right.