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Crank
3 years ago
13

What does it mean to test a hypothesis?

Engineering
1 answer:
AysviL [449]3 years ago
6 0
Answer: See if the results of an experiment are what the scientist predicted.
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View the picture below and then correctly answer the questions using the following words: Temperate Zone, Tropical Zone, Polar Z
Nadusha1986 [10]

Can you provide the picture? Thanks !

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3 years ago
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Yasir is trying to build an energy-efficient wall and deciding what materials to use. How can he calculate the thermal resistanc
777dan777 [17]

Answer:

Add the thermal R values of each wall layer.

Explanation:

Fiberglass insulation R value, sheetrock, sheathing, siding etc.  All sum together to one composite opposition to heat transfer/loss.

Q= U x A x Delta T

Q= heat transfer btuh

U= 1/R inverse of resistance

A= area of surface

Delta T is temerature difference across the wall.

8 0
3 years ago
28. What is the value of a resistor in a series circuit if you measure 0.5 amps flowing through it and 15 volts
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3 years ago
What is the angular velocity (in rad/s) of a body rotating at N r.p.m.?
Darina [25.2K]

Answer:

0.1047N

Explanation:

To solve this problem we must remember the conversion factors, remembering that 1 revolution equals 2π radians and 1min equals 60s

N\frac{rev}{min} \frac{2\pi }{1rev} \frac{1min}{60} =N\frac{2\pi }{60} =0.1047N

in conclusion, to know how many rad / s an element rotates which is expressed in Rev / min we must only multiply by 0.1047

3 0
3 years ago
In the construction of a large reactor pressure vessel, a new steel alloy with a plane strain fracture toughness of 55 MPa-m1/2
sp2606 [1]

Answer:

l=24mm

Explanation:

From the question we are told that:

Plane strain fracture toughness of T=55 MPa-m1/2

Y value Y=1.0

Stress level of\sigma =200 MPa

Generally the equation for length of a surface crack is mathematically given by

l=\frac{1}{\pi}(\frac{T}{Y*\sigma})^2

l=\frac{1}{3.142}(\frac{55}{1*200})^2

l=0.024m

Therefore

in mm

l=24mm

6 0
3 years ago
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