Dowqueuestbew1j
2021-12-17
Answered

Ropes 3 m and 5 m in length are fastened to a holiday decoration that is suspended over a town square. The decoration has a mass of 5 kg. The ropes, fastened at different heights, make angles of 52° and 40° with the horizontal. Find the tension in each wire and the magnitude of each tension.

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asked 2020-12-01

The boom weighs 2600N. The boom is attached with a frictionless pivot at its lower end. It is not uniform; the distance of its center of gravity from the pivot is 35% of its length. a) Find the tension in the guy wire and the horizontal and vertical components of the force exerted on the boom at its lower end. b) Does the line of action of the force exerted on the boom a tits lower end lie along the boom?

asked 2020-11-22

The specific heat of lead is 0.030 cal/g.C. 300 grams of leadshot at 100C is mixed with 100 grams of water at 70C in an insulated container. The final temperature of the mixture is:

A) 100C

b) 85.5C

c)79.5C

d) 74.5C

e)72.5C

A) 100C

b) 85.5C

c)79.5C

d) 74.5C

e)72.5C

asked 2021-02-21

A small block with mass m is placed inside an inverted conethat is rotating about a vertical axis such that the time for onerevolution of the cone is T. the walls of the cone make an angle Bwith the vertical. The coefficient of static friction betweenthe block and the cone is ?. Draw a free body diagram.If the block is to remain a constant height h above the apex of thecone, what are the maximum and minimum values of T?

asked 2021-04-21

The arm weighs 44.0 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.

t=N

s=N

t=N

s=N

asked 2021-10-08

Find the slope of the tangent line to the parabola

lines through (2,4). Write an equation for the tangent line to the parabola at this point.

asked 2021-11-14

Let A and B be $$A=\left[\begin{array}{ccc}1& 0& -2\\ 3& 1& 0\\ 1& 0& -3\end{array}\right],\text{}B=\left[\begin{array}{ccc}1& 0& -3\\ 3& 1& 0\\ 1& 0& -2\end{array}\right]$$
Find an elementary matrix E such that EA=B.

asked 2021-12-16

An iceberg (specific gravity 0.917) floats in the ocean (specific gravity 1.025 ). What percent of the volume of the iceberg is under water?