BIO MOMENTUM AND THE ARCHERFISH. Archerfish are tropical fish that hunt by shooting drops of water from their mouths at insects above the water’s surface to knock them into the water, where the fish can eat them. A 65-g fish at rest just at the surface of the water can expel a 0.30-g drop of water in a short burst of 5.0 ms. High-speed measurements show that the water has a speed of 2.5 m/s just after the archerfish expels it. 8.109 The fish shoots the drop of water at an insect that hovers on the water’s surface, so just before colliding with the insect, the drop is still moving at the speed it had when it left the fish’s mouth. In the collision, the drop sticks to the insect, and the speed of the insect and water just after the collision is measured to be 2.0 m/s. What is the insect’s mass? (a) 0.038 g; (b) 0.075 g; (c) 0.24 g;(d) 0.38 g.
BIO MOMENTUM AND THE ARCHERFISH. Archerfish are tropical fish that hunt by shooting drops of water from their mouths at insects above the water’s surface to knock them into the water, where the fish can eat them. A 65-g fish at rest just at the surface of the water can expel a 0.30-g drop of water in a short burst of 5.0 ms. High-speed measurements show that the water has a speed of 2.5 m/s just after the archerfish expels it. 8.109 The fish shoots the drop of water at an insect that hovers on the water’s surface, so just before colliding with the insect, the drop is still moving at the speed it had when it left the fish’s mouth. In the collision, the drop sticks to the insect, and the speed of the insect and water just after the collision is measured to be 2.0 m/s. What is the insect’s mass? (a) 0.038 g; (b) 0.075 g; (c) 0.24 g;(d) 0.38 g.
BIO MOMENTUM AND THE ARCHERFISH. Archerfish are tropical fish that hunt by shooting drops of water from their mouths at insects above the water’s surface to knock them into the water, where the fish can eat them. A 65-g fish at rest just at the surface of the water can expel a 0.30-g drop of water in a short burst of 5.0 ms. High-speed measurements show that the water has a speed of 2.5 m/s just after the archerfish expels it.
8.109 The fish shoots the drop of water at an insect that hovers on the water’s surface, so just before colliding with the insect, the drop is still moving at the speed it had when it left the fish’s mouth. In the collision, the drop sticks to the insect, and the speed of the insect and water just after the collision is measured to be 2.0 m/s. What is the insect’s mass? (a) 0.038 g; (b) 0.075 g; (c) 0.24 g;(d) 0.38 g.
A.0200kg bullet hits a 5.00kg wood block that is sitting at rest on a rough horizontal surface. The
bullet lodges in the block and the bullet and block slide together with speed VA-0.750m/s after the
collision.
Before the collision
After the collision
V=?
(at rest)
VA=0.750m/s
D
a) Even though the surface is rough, why can momentum be regarded as being conserved during the
collision?
b) Find the speed of the bullet before the collision.
A 6040 kg space probe, moving nose-first toward Jupiter at 240 m/s relative to the Sun, fires its rocket engine, ejecting 120 kg of
exhaust at a speed of 240 m/s relative to the space probe. What is the final velocity of the probe?
Number i 249.7297
Units
m/s
A2.3- kg object traveling at 6.1 m/s collides head- on with a 3.5- kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the final speed of the 2.3- kg object?
O 0.48 m/s
O 43 m/s
O 7.1 m/s
O 6.6 m/s
O 3.8 m/s
Chapter 8 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
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