Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100. m from the mothership. She throws her 2.00 kg wrench at 20.0 m/s in a direction away from the ship
If she and her spacesuit have a combined mass of 200. kg how long does it take her to coast back to her spaceship? A) 1000. s
B) 750. s
C) 250. s
D) 2.50 minutes
E) 500. s
E
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A fastener bolt for the engine on a supersonic jet aircraft has a crosssectional area of 2.0 cm 2 and a length of 4.0 cm. The bolt part must be able withstand a tensile force of 10 × 104 N, and as a factor of safety this tensile force can produce a stress of no more than 50 percent of the tensile yield stress in the bolt. For sufficient resistance to fracture this critical bolt must have at least 15 percent strain to fracture. Because weight is critical for this jet aircraft design the maximum weight possible for this bolt is 40 g. The bolt is subject to temperatures up to 400°C (752°F).
To minimize the possibility of high temperature plastic strain the selected material should not be subject to more than 1/3 of its melting temperature. Of the materials covered in this chapter what would be the best material to select? Because this is a supersonic jet aircraft high priced materials can be utilized.
The separation of the strong force and the electroweak force ____
a. provided the energy for a rapid inflation of the early Universe b. created the cosmic microwave background radiation c. balanced the critical density of the Universe to solve the flatness problem d. created dark matter e. created dark energy
At a carnival game, two balls, identical in mass and radius, are made of steel and of rubber. They are offered as a means of knocking over a bowling pin by throwing them at the pin. If they are thrown with the same speed and hit the same spot on the bowling pin, which is more likely to knock the pin over?
A. The steel ball B. Without knowing more information this cannot be answered. C. The clay ball D. Both are equally likely since they have the same momentum
On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3
(a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X?