What is the acceleration of the baseball?
A batter strikes a baseball with a mass of 0.15 kg using a force of 18 kN. What is the acceleration of the baseball? (Points: 3)
1. 9.8 m/s²
2. 120,000 m/s²
3. 2,700 m/s²
4. 8.3 m/s²
A block of metal weighs 60 newtons on Earth. When taken to the moon, it weighs 10 newtons. What is the acceleration due to gravity on the moon? (Points: 3)
1. 6.0 m/s²
2. 1.6 m/s²
3. 9.8 m/s²
4. 1.0 m/s²
A 60 kg student in a rowboat on a still lake decides to dive off the back of the boat. The student's horizontal acceleration while in contact with the boat is 2.0 m/s². What horizontal force does the student exert on the boat? (Points: 3)
1. 30 N toward the front of the boat
2. 30 N toward the back of the boat
3. 120 N toward the back of the boat
4. 120 N toward the front of the boat
A pitcher exerts a force on a baseball that is 30 times greater than the ball's weight. What is the acceleration of the baseball? (Points: 3)
1. 290 m/s²
2. 1.0 m/s²
3. 9.8 m/s²
4. 30 m/s²
A dog, when soaked, typically shakes its body rapidly to remove water from its fur. Which of the following best explains this phenomenon? (Points: 3)
1. The force of shaking back and forth is the action, and the force pushing the water from the dog's fur is the reaction.
2. The water droplets are small and require zero force to accelerate them.
3. After leaving the dog's hair, the water tends to continue moving in the same direction when the fur's motion changes direction.
4. The mass of the dog is smaller than the inertia of the water.
1 Answers
16
a = 18e3/ 0.15 = 120,000 m/s2
17
m = 60 /10 = 6 kg
g’ at moon = 10 /6 = 1.6 m/s²
18
120 N toward the front of the boat
19
30 times the ball's weight => 30times g = 290 m/s²
20
After leaving the dog's hair, the water tends to continue moving in the same direction when the fur's motion changes direction.
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