1. Determine wether the statements is true or false. If false, explain why.

Maria theresa Tenio
2022-07-01

1. Determine wether the statements is true or false. If false, explain why.

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asked 2021-02-09

A uniform plank of length 2.00 m and mass 30.0 kg is supported by three ropes. Find the tension in each rope when a 700-N person is 0.500 m from the left end.

asked 2021-01-04

Four very long, current-carrying wires in the same plane intersect to form a square with side lengths of 45.0 cm, as shown in the figure blelow. The currents running through the wires are 8.0 A, 20.0 A, 10.0 A, and I.

Part A

Find the magnitude of the current I that will make the magnetic field at the center of the square equal to zero.

Part B

What is the direction of the current I (up or down)?

asked 2021-02-19

An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airpline's engine is first started, it applies a constant torque of $1950\text{}N\cdot m$ to the propeller, which starts from rest.

a) What is the angular acceleration of the propeller? Model the propeller as a slender rod.

b) What is the propeller's angular speed after making 5.00 revolutions?

c) How much work is done by the engine during the first 5.00 revolutions?

e) What is the instantaneous power output of the motor at the instant that the propeller has turne through 5.00 revolutions?

asked 2020-11-01

A rifle with a weight of 30 N fires a 5.0 g bullet with a speed of 300m/s. (a) Find the recoil speed of the rifle. (b) If a700 N man holds the rilfe firmly against his shoulder, find there coil speed of the man and his rifle.

asked 2022-04-30

Determine if the two vectors are skew lines or if they intersect each other. !D = h2;3;1i+d h5;3;6i and −!F = h−5;−3;−5i+ f h15;3;−3i

asked 2022-04-19

What is the correct notation for non simultaneous (asynchronous) equations?

most common practice is when we type simultaneous equations in form like that:

$\{\begin{array}{l}x+y=2\\ x-y=2\end{array}$

But, what if have equation like

${x}^{4}-5{x}^{2}+6=0$

and i want to denote it into 2 equations:

${x}^{2}=2$

and ${x}^{2}=3$

asked 2022-05-09

a card is chosen from a standard deck of 52 cards, what is the probability that a spade and a heart is chosen