# The drawing shows an A-shaped stepladder. Both sides of the ladder

Get college assignment help at uniessay writers The drawing shows an A-shaped stepladder. Both sides of the ladder are equal in length. This ladder is standing on a frictionless horizontal surface, and only the crossbar (which has a negligible mass) of the “A” keeps the ladder from collapsing. The ladder is uniform and has a mass of 20.0 kg. Determine the tension in the crossbar of the ladder.

## Two friends, Al and Jo, have a combined mass of 136

Two friends, Al and Jo, have a combined mass of 136 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart, because they are holding each other. When they release their arms, Al moves off in one direction at a speed of 1.23 m/s, while Jo moves off in the opposite direction at a speed of 0.946 m/s. Assuming that friction is negligible, find Al’s mass.

## How much work is needed for a 68 {rm kg} runner

How much work is needed for a 68 {rm kg} runner to accelerate from rest to 6.0 {rm m/s}?

## A barbell consists of two small balls, each with mass 550

A barbell consists of two small balls, each with mass 550 grams (0.55 kg), at the ends of a very low mass rod of length d = 40 cm (0.4 m). The center of the barbell is mounted on the end of a low mass rigid rod of length b = 0.6 m (see Figure), and this rod rotates clockwise with angular speed 120 rad/s. In addition, the barbell rotates clockwise about its own center, with an angular speed 100 rad/s. Calculate L_rot (both magnitude and direction).

## A chair of mass 10.0 is sitting on the horizontal floor;

A chair of mass 10.0 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 39.0 below the horizontal and the chair slides along the floor.

## If the loop is rotated in the opposite direction by the

If the loop is rotated in the opposite direction by the same amount, the change in magnetic flux: (Select all that apply.) -has the same magnitude. -has opposite sign. -has a smaller magnitude. -has the same sign. -has a larger magnitude.

## Suppose we have an infinitely long wire carrying a current of

Suppose we have an infinitely long wire carrying a current of 4.0 A. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field at a point P with coordinates (0.2 m, 0.2 m).

## Suppose the magnetic field changes uniformly from 0.558 T to 0.183

Suppose the magnetic field changes uniformly from 0.558 T to 0.183 T in the next 0.588 s. (a) Compute the induced emf in the coil. E = (b) Compute the magnitude and direction of the induced current. I =

## long horizontal wire carries a current of = 46 . A

long horizontal wire carries a current of = 46 . A second wire, made of 1.00–diameter copper wire and parallel to the first, is kept in suspension magnetically 5.0 below (the figure).

## If the resistance in the circuit is 0.609 Ω, find the

If the resistance in the circuit is 0.609 Ω, find the current in the circuit and the power delivered to the resistor. (Note: The current, in this case, goes counterclockwise around the loop.) I = P =

## Suppose the current suddenly increases to 1.74 A in the same

Get college assignment help at uniessay writers Suppose the current suddenly increases to 1.74 A in the same direction as before, due to an increase in speed of the bar. (a) Find the emf induced in the rod. εnew = V (b) Find the new speed of the rod. vnew = m/s

## Ball A has a mass of 0.9 kg and moves with

Ball A has a mass of 0.9 kg and moves with an initial speed of 10.6 m/s. It collides with stationary balls B and C, whose centers are on a line perpendicular to the initial velocity of ball A and that are initially in contact with one-another. Balls B and C are identical and have a mass of 0.6 kg. After the collision, balls B and C have the same speed, 3.2 m/s, but ball B moves at an angle of 26 above the horizontal and ball C moves at an angle of 26 below the horizontal. What is the velocity of ball A after the collision? (Answer in units of m/s.)

## A 4.30 102 kg hot-air balloon takes off from rest at

A 4.30 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing 9.70 104 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 7.00 m/s?

## The weight of passengers on a roller coaster increases by 58

The weight of passengers on a roller coaster increases by 58 as the car goes through a dip with a 40 radius of curvature. What is the velocity of the cart at the bottom of the track?

## In a ballistics test, a 23.0 g bullet traveling horizontally at

In a ballistics test, a 23.0 g bullet traveling horizontally at 1300 m/s goes through a 40.0 cm-thick 450 kg stationary target and emerges with a speed of 900 m/s. The target is free to slide on a smooth horizontal surface.

## A rock is suspended from a string and moves downward at

A rock is suspended from a string and moves downward at constant speed. Which statement is true concerning the tension in the string if air resistance is ignored?

## A 16300kg airplane lands with a speed of 74 m/s on

A 16300kg airplane lands with a speed of 74 m/s on a stationary aircraft carrier deck that is 115 m long. Find the work done by nonconservative forces in stopping the plane. How do i do this?

## Three ropes are attached to a small ring. Two of the

Three ropes are attached to a small ring. Two of the ropes are attached to walls at right angles with tensions of 80 N north wall, 50 N west wall. What are the magnitude and direction of the tension of the third rope?

## A tennis player receives a shot with the ball of mass

A tennis player receives a shot with the ball of mass 0.060kg traveling horizontally at v=43 m/s and returns the shot with the ball traveling horizontally at 60 m/s in the opposite direction. (a) What is the impulse delivered by the ball to the racquet?

## A 15.0 {rm kg} rock slides on a rough horizontal surface

A 15.0 {rm kg} rock slides on a rough horizontal surface at 6.00 {rm m/s} and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.200.

## What is the acceleration of a 747 jumbo jet, mass 32,000

What is the acceleration of a 747 jumbo jet, mass 32,000 kg, in takeoff when the thrust for each of its four engines is 28,000 N?

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