Spacecraft have imaged erupting volcanoes on Io and Triton
Indicate whether the statement is true or false
TRUE
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A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be
A) less. B) the same. C) more.
Why isn't the Sun shrinking or expanding?
A) Because the Sun is spinning so fast, the centrifugal forces keep the surface of the Sun supported against collapse. B) because gas pressure balances gravity in the Sun C) because the Sun is solid D) because the Sun has lived for billions of years
A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?
a. 39 N b. 20 N c. 44 N d. 0 N e. 30 N