Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room
A) blocks of foam plastic.
B) large tubs of water.
C) an ample supply of fire wood.
D) none of the above
Answer: B
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A mission that NASA is planning to launch between 2022 and 2025 will be able to confirm the presence of a subsurface ocean on Europa by using a
A) spectrometer to detect the spectral signature of liquid water at and beneath the surface B) camera to observe the formation and breakup of icebergs on the surface C) projectile to break the thin icy crust to reveal the water below D) laser altimeter to detect the regular bulging of the thin icy crust on top of the ocean due to tidal forces
A hyperopic eye can focus on objects which are 75. cm and farther. What POWER and what FOCAL LENGTH spectacles should be prescribed so it can see objects 25. cm and farther from the eye? (Assume negligible distance between spectacles and eye.)
What will be an ideal response?
A child runs at 3.0 m/s and jumps onto a sled, initially at rest. If the child's mass is 36 kg, and if the child and sled slide off together at 2.0 m/s after the collision, the sled's mass is
A. 48 kg. B. 18 kg. C. 12 kg. D. 36 kg.
What type of decay changes only the energy of a nucleus and not its identity?
a. Positron b. Alpha c. Gamma d. Beta