chi sann
2022-05-04

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asked 2020-10-27

A rocket is fired in deep space, where gravity is negligible. In the first second it ejects of $\frac{1}{160}$ its mass as exhaust gas and has an acceleration of $16.0\text{}\frac{m}{{s}^{2}}$.

What is the speed of the exhaust gas relative to the rocket?

asked 2020-10-27

Problem: A 0.500kg block attached to a spring with the length 0.60m and force constant k=40.0 N/m is at rest with the back of the block at point A on a frictionless, horizontal airtable. The mass of the spring is negligible. You pull the block tothe right along the surface with a constant horizontal forceF=20.0-6N.

Questions:

A.) What is the blocks

asked 2021-02-25

A 1000 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 50 cm. What is the spring constant of the spring?

asked 2021-02-12

A skier of mass 70 kg is pulled up a slope by a motor driven cable. (a) How much work is required to pull him 60m up a 30 degree slope (assumed frictionless) at a constant speed of 2.0 m/s ?(b) What power must a motor have to perform this task?

asked 2021-12-03

Solve the definite/improper integral, tell if it converges or diverges.

${\int}_{-2}^{5}\frac{2x+4}{2{x}^{2}+21x+34}dx$

asked 2021-11-17

A process yields 10% defective items. For testing purposes, 100 items are randomly selected from the process. A normal distribution may be approximated in order to get the probability of any event.

- What is the probability that the number of defectives exceeds 13?

- What is the probability that the number of defectives is less than 8?

- What is the probability that the number of defectives exceeds 13?

- What is the probability that the number of defectives is less than 8?

asked 2022-05-28

Tried playing with the formula of Conditional probability and some variations of combinatorics, because i know for sure that the 6th toss was head (we stop on the 3rd time we get head, and it's given to us that we stopped after 6 tosses). I know the answer is 0.4, but I cant unserstand how to get this answer, any help?