A girl weighing 450. N sits on one end of a seesaw that is 3.0 m long and is pivoted 1.3 m from the girl. If the seesaw is just balanced when a boy sits at the opposite end, what is his weight? Neglect the weight of the seesaw
What will be an ideal response?
344. Newtons
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We can estimate the mass of the Galaxy from observations of its ________ curve
Fill in the blank(s) with correct word
A 0.0040-kg lead bullet is traveling at a speed of 220 m/s when it embeds in a block of ice at 0°C. If all the heat generated goes into melting ice, what quantity of ice is melted? (Lf = 80 kcal/kg, the specific heat of lead = 0.03 kcal/kg/°C, and 1 kcal = 4 186 J)
a. 1.6E–2 kg b. 5.8E–4 kg c. 4.6E–3 kg d. 2.9E–4 kg e. 1.9E–5 kg
The __________ occurs when electrons are emitted when light strikes the surface of a metal
Fill in the blank(s) with correct word
Solar-type stars in our galaxy are
A) very common, making up about 50% of the total B) very rare (less than 1%) C) fairly common (several percent) D) the most common type of stars in our galaxy (75% or more)