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How does friction affect the motion of a car?

How does friction affect the net force on an object?

A fielder in a cricket match throws the ball to the wicket-keeper. At one moment of time, the ball has a horizontal velocity of 16 ms and a velocity in t the vertically upward direction of 8.9 ms ¹

(a) Determine, for the ball :

Its resultant speed

Convert 8m/s2 to km/s2

I need help with this question please! I have no idea how to do it

Electron in a hydrogen atom makes a transition from -13.58 eV to -0.38eV by absorbing a photon. Calculate the frequency of radiation emitted when it falls back to -13.58eV.

A) a vector scale diagram and b) components 

A laser beam passes through a single slit of width 0.0211 mm andproduces a pattern with an intensity distribution like that shownin Figure 13a in the lab manual on a screen 98.2 cm away. If thespacing between the minima on either side of the central maximum is5.88 cm (in other words, 2y1 in Figure 13b), the wavelength of thelight is

________ nm.

Consider two diffraction gratings; one has 4000 lines per cm andthe other one has 6000 lines per cm. Choose the beststatment below when comparing the dispersion of the twogratings.

A) The 4000-line grating produces the greater dispersion

B) The 6000-line grating produces the greater dispersion

C) Both gratings produce the same dispersion, but the orders aresharper for the 4000-line grating.

D) Both gratings produce the same dispersion, but the orders aresharper for the 6000-line grating.

An alarm clock is set to go off in one hour when it is at rest. The alarm clock is set in motion at 0.95 times the speed of light.

1. Calculate how long it would take the alarm to go off for stationary observers watching it move away at 0.95 c.
2. How long would the alarm take to go off for an observer travelling with the alarm clock? 

<p>How many electrons are contained in the ion 13 Carbon+&#160;?</p>

A meter stick is hinged at its lower end and allowed to fall from avertical position. If its moment of
inertia is ML2/3, with what angular speed does it hit the table?

A skyrocket explodes 127 m above the ground. Three observers arespaced 128 m apart, with observer A directly under the point of theexplosion. Find the ratio of the sound intensity heard by observerA to that heard by observer B. For practical purpose, you may treateach observer as a point on the ground.

Can you find a vector quantity that has a magnitude zero but components that are different from zero?

A glider is gliding through the air at a height of 416 meters with a speed of 45.2 m/ s. The glider dives to a height of 278 meters. Determine the glider's new speed.

A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 8.6 m/s. Also, it has an acceleration in the direction parallel to the walls of 4.2 m/s 2 . 18.4 m 4.2 m/s 2 8.6 m/s What will be its speed when it hits the opposing wall? Answer in units of m/s.

In what region of space is the potential due to a uniformly charged sphere the same as that of a point charge? In what region does it differ from that of a point charge?

Our professor asked us this question and I have no idea! Will ratelifesaver for a very well developed answer.

Suppose an alien civilization attempts to invade the Earth, and allthe alien troopers are equipped with particle beam weapons: weaponsthat shoot a stream of high-velocity charged particles (electronsand protons). The hastily-formed Earth Defense Corps pulls recruitsfrom armies all over the world, and issues superstrong bar magnetsas a defense against the devastating particle-beam weapons.

The question: suppose you're a trooper in the EDC, and on thebattlefield, you see an alien taking aim at you with the particlebeam weapon. You pull out your trusty (you hope) bar magnet, andprepare to defend yourself with it. The excitement (or terror?) ofbattle completely erases all your training from memory ... but youdo recall enough of your second-quarter physics course in order tohold the bar magnet in such a way as to protect yourself from thelethal particle beam headed your way. Which way do you hold (oraim) the bar magnet, and why?

Two point charges are on the y-axis. A 2.5 µC charge is located aty = 1.30 cm, and a -2.46 µC charge is located at y = -1.90cm.
(a) Find the total electric potential at the origin.
(b) Find the total electric potential at the point havingcoordinates (1.50 cm,0).

Block A with a mass of 2.0 kg moves along the x axis with a velocity of 5.0m/s in the positive x direction. It suffers an elastic collision with block B, initially at rest, and the blocks leave the collision long the x axis. If B is much more massive than A what is speed of A after the collision?

Tensionthree objects are connected on the table as shown in figure p5.44. the table is rough and has a coefficient of kinetic friction of 0.350. the objects have masses of 4.00 kg, 1.00 kg and 2.00 kg as shown and the pulleys are frictionless. draw free-body diagrams of each of the objects. Determine the acceleration of each object and their directions. Determine the tension in two cords

evalute the following and use the correct number of significant figures. show all work .

2.35cm x 4.6 cm 

A bicyclist traveling at 10m/s slows down to turn a corner. After completing the turn, the bicyclist then has a speed of 7 m/s at an angle of 90o to the original direction. If it takes  7 s to complete the turn, what is the magnitude of the bicyclist's average acceleration?

*. A particle undergoes three successive displacements in a plane as follows: 
4.0m southwest, 5.0m east, 6.0 m in a direction 60o north of east. 
Choose the y-axis pointing north and the x-axis pointing east and find
A 30m
 250
 200
B 20mi) The components of each displacement,
ii) The components of the resultant displacement, [5.17 , 2.37 ] m m
iii) The magnitude and direction of the resultant displacement, 
0 [5.69 ,24.63 ] m and 
iv) Graphically show the approximate displacement of the part

The question is attached.

Describe how you could charge a copper sphere suspended from an insulating thread using the following methods. Describe other materials you might require.

a) Friction

b) Conduction

c) Induction

A cable exerts a constant upward tension of magnitude on a elevator as it rises through a vertical distance of . (a) Find the work done by the tension force on the elevator. (b) Find the work done by the force of gravity on the elevator.

This is a physics question using static friction:

An ice fishing hut weighing 52 N sits on a dry, frozen lake.

(a) What is the magnitude of the initial horizontal force required to make the ice-fishing hut start sliding across the surface of the frozen pond?

is the orb moving?

Miniature giraffe ran half of the distance with speed v1 and another half of the distance with speed v2. What was the average speed of this run?

Draw a free body diagram for each 

a) a book that has been thrown but is now sliding across the floor to a stop
b) a painting hung on the wall supported by a nail
c) a car driving down the road applying the brakes
d) a large helium balloon floating in the air and firmly attached to the ground with a cable

A particle with charge 8 µC is located on the x-axis at the point 8 cm , and a second particle with charge 7 µC is placed on the x-axis at 4 cm . −10−8 −6 −4 −2 2 4 6 8 10 8 µ C 7 µ C 8 µ C x → (cm) What is the magnitude of the total electrostatic force on a third particle with charge 8 µC placed on the x-axis at 2 cm ? The Coulomb constant is 8.9875 × 109 N · m2 /C 2 . Answer in units of N.

A circular loop lies with its plane normal to a magnetic field given by B=(2.500 - 0.0100t) T, where t denotes the time in seconds. The induced emf in the loop is 2.90 V. Calculate the radius of the loop.

After driving a portion of the route, the taptap is fully loaded with a total of 27 people including the driver, with an average mass of 64 kg per person. In addition, there are three 15-kg goats, five 3-kg chickens, and a total of 25 kg of bananas on their way to the market. Assume that the springs have somehow not yet compressed to their maximum amount. How much are the springs compressed? Enter the compression numerically in meters using two significant figures.

1- A 40.0cm diameter loop is turned to the position where the largest flux is handled in a uniform electric field. In this position, the flux is obtained as 5.20 × 10 ^ 5 N.m ^ 2/c Find the twist of the electric field.

2- An electron was released from rest in a uniform electric field of 5.90 × 10 ^ 3 V / m. How much potential awareness (V) will pass after 1cm movement, and what is the time of the electron in position (m / s)? [m (e) = 9.11 × 10 ^ -31 kg, | q (e) | = 1.60 × 10 ^ -9 C.]

A water pipe with an inner diameter of 20 mm emits 30 kg of water for 1 minute. Calculate the rate at which the water leaves the pipe.

One end of a cylindrical pipe has a radius of 1.5 cm. Water streams steadily out at 7.0m/s. The density of water is 1.0×103kg/m3. Calculate the volume flow rate.

A hiker walks 3.9 km SW from the parking lot to the Scenic Lake in 1.14 h. After taking an extended lunch break there for 1.9 h, they walk through a displacement of 6.8 km, 20 degrees South of East, reaching their camp site after another 21.9 h.

What is the magnitude of the hiker's average velocity? Provide your answer in km/h, use three significant figures. Do not use scientific notation.