1 Which statement BEST describes how a golf club does "work" on a golf ball? (A) When the club hits the ball the club transfers
1 answer:
Answer:
(C) Some of the kinetic energy from the golf club is transferred to the ball and some transforms into sound and heat, but the total energy remains the same.
Explanation:
According to the law of conservation of energy, the total energy of a closed system is constant.
In this problem, the main type of energy involved is the kinetic energy.
Kinetic energy is the energy possessed by an object due to its motion; mathematically, it is calculated as
where
m is the mass of the object
v is its speed
In this problem, at the beginning, the golf club is moving, therefore it has kinetic energy.
Then, the club hits the ball, which is put in motion: therefore, the ball has acquired kinetic energy as well. This energy has been transferred from the golf club, which has therefore lost part of its energy.
At the same time, sound and heat are produced in the collision between the golf club and the ball. Since the total energy must be conserved, this means that the initial kinetic energy of the golf club must be equal to the sum of ball's kinetic energy + sound energy + heat energy released in the collision.
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Answer:
C. 12m
Explanation:
from the graph v = 4m/s and t = 3 s
d = vt = 4 × 3 = 12 m
The apparent weight of a 1.1 g drop of water is 4.24084 N.
<h3>What is Apparent Weight?</h3>- According to physics, an object's perceived weight is a characteristic that describes how heavy it is. When the force of gravity acting on an object is not counterbalanced by a force of equal but opposite normality, the apparent weight of the object will differ from the actual weight of the thing.
- By definition, an object's weight is equal to the strength of the gravitational force pulling on it. It follows that even a "weightless" astronaut in low Earth orbit, with an apparent weight of zero, has almost the same weight that he would have if he were standing on the ground; this is because the gravitational pull of low Earth orbit and the ground are nearly equal.
Solution:
N = Speed of rotation = 1250 rpm
D = Diameter = 45 cm
r = Radius = 22.5 cm
M = Mass of drop = 1.1 g
Angular speed of the water =
Apparent weight is given by
= 4.24084 N
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Question:
The spin cycle of a clothes washer extracts the water in clothing by greatly increasing the water's apparent weight so that it is efficiently squeezed through the clothes and out the holes in the drum. In a top loader's spin cycle, the 45-cm-diameter drum spins at 1250 rpm around a vertical axis. What is the apparent weight of a 1.1 g drop of water?