_______ are an especially good indicator of climate change because scientists can find clues about ancient organisms and their environments.
fossils if I am not mistaken
What is an important similarity between sound and light?a. Both are transverse waves. b. Both are longitudinal waves. c. Both travel with same speed in air. d. Both can show interference effects.
d) both can show interference effects
Which is not true about neutron? (a) It is neutral particle (b) It is highly unstable in nature (c) It is present in the nucleus. (d) It contributes to the most of the atom
(b) It is highly unstable in nature. Neutrons are actually quite stable and are present in the nucleus.
Just after a motorcycle rides off the end of a ramp and launches into the air, its engine is turning counterclockwise at 8325 rev/min. The motorcycle rider forgets to throttle back, so the engine's angular speed increases to 12125 rev/min. As a result, the rest of the motorcycle (including the rider) begins to rotate clockwise about the engine at 4.2 rev/min. Calculate the ratio IE/IM of the moment of inertia of the engine to the moment of inertia of the rest of the motorcycle (and the rider). Ignore torques due to gravity and air resistance.
Engine operating speed nf = 8325 rev/min
engine angular speed ni= 12125 rev/min
motorcycle angular speed N_m= - 4.2 rev/min
ratio of moment of inertia of engine to motorcycle is given as
Initial angular speed of engine()=8325 rpm
Final angular speed of engine()=12125 rpm
Initial angular speed of Motorcycle()=0 rpm
Final angular speed of engine()=4.2 rpm
as there is no external torque therefore angular momentum remains conserved
A box of groceries requires 5.0 newtons of force to lift it up 1.0 meter. How much work is done?
Work is defined as the amount of force done multiplied by the distance it was applied. Since it is already given that the object of interest (a box of groceries) was lifted up 1 meter by a force of 5 newtons, work done can be solved using the following formula:
Work = Force * distance Work = 5 N * 1 meter Work = 5 N*m = 5 J
A good sign that cardiovascular exercise is occurring is that you _____.
Answer: are breathing much faster
Exercise is a physical activity which increases the rate of respiratory and cardiovascular activity of the body. The cardiovascular exercise is likely to increase the rate at which the heart pumps blood as the body faces the scarcity of oxygen in the muscles which conducts the exercise. This increases rate of breathing so as to acquire more amount of oxygen. The oxygenated blood is pumped by the heart to all the parts of the body.
Are breathing hard. This is because cardiovascular exercise makes the heart beat faster which in turn creates a need for more air.