Where on the physical activity pyramid do lifestyle activities belong?
The Physical Activity Pyramid: Top level of pyramid is Sedentary activities, Second level is Anaerobic and Flexibility activities, Third level is Aerobic activities, and bottom level is Lifestyle activities.
A.
A
B.
B
C.
C
D.
D
Please select the best answer from the choices provided.
A
B
C
D
Solved
Show answers
More tips
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
- F Family and Home Why Having Pets at Home is Good for Your Health...
- H Health and Medicine How to perform artificial respiration?...
- H Health and Medicine 10 Tips for Avoiding Vitamin Deficiency...
- F Food and Cooking How to Properly Cook Buckwheat?...
- F Food and Cooking How Many Grams Are In a Tablespoon?...
- L Leisure and Entertainment Carving: History and Techniques for Creating Vegetable and Fruit Decorations...
- P Photography and Videography How to Choose the Perfect Photo Paper for Your Images?...
- H Health and Medicine What vaccines do children need?...
- H Health and Medicine Reasons for the Appearance of Warts: Everything You Need to Know...
Answers on questions: Physics
- P Physics Asmall but very dense mass of 402 kg is brought close to a second small but very dense mass of 133 kg on a frictional surface with coefficient of friction 1.6. at what...
- P Physics Asinusoidal voltage δν= 37.5 sin( 100t), where δν is in volts and t is in seconds, is applied to a series rlc circuit with l-140 mh, c 99.0 μf. and r 63.0 ω. (a) what...
- P Physics Aski tow operates on a slope of angle 15.6 ∘ of length 340 m . the rope moves at a speed of 12.7 km/h and provides power for 53 riders at one time, with an average...
- P Physics Asmall bead of mass m is attached to one end of a (thin, rigid, massless) bar of length r, while the other end of he bar is fixed in place but free to pivot, such that...
- P Physics Asilicon pn junction diode is constructed using n-type silicon in which the fermi level is 170 mev below the conduction band edge and p-type silicon in which the fermi...
- P Physics Asingly charged ion of 7li (an isotope of lithium which lost only one electron) has a mass of 1.16 ×10^-26 kg. it is accelerated through a potential difference of 224...
- P Physics Asatellite of mass m 400 kg is observed with the initial speed v 3 km/s at the initial altitude h 4000 km above the earth s surface. the satelite descends in a free...
- P Physics Asecond s pendulum is taken to the moon. what will be the time period of the pendulum at the moon? (acceleration due to gravity at the surface of the moon is 1/6 on...
- P Physics Asingle atom of americium-241 has a mass, in atomic mass units, of 241.0568291 u. (a) determine the mass defect, in atomic mass units. u (b) determine the total binding...
- P Physics Aseries of measurements of a physical quantity gave us the following numbers (in some unit): 2. 17.47468 17.47392 17.47616 17.47499 17.47257 a. calculate the best estimate...
Ответ:
(a) W = +397.1 J
(b) W = -204.6 J
(c) W = 0
(d) W= + 192.5 J
Explanation:
Work (W) is defined as the product of force (F) by the distance (d)the body travels due to this force. :
W= F*d Formula ( 1)
The forces that perform work on an object must be parallel to its displacement.
The forces perpendicular to the displacement of an object do not perform work on it.
The work is positive (W+) if the force has the same direction of movement of the object.
The work is negative (W-) if the force has the opposite direction of the movement of the object.
Problem development
(a) Work performed by the worker's applied force on the box .
W= 209 N * 1.9 m = +397.1 J
(b) Work performed by the gravitational force on the crate
We calculate the weight component parallel to the displacement of the box:
We define the x-axis in the direction of the inclined plane ,25.0° to the horizontal.
We define the y-axis and in the direction of the plane perpendicular to the inclined plane.
W= m*g=26*9.8= 254.8N : total box weight
Wx= W*sen25.0°= 254.8*sen25.0°= 107.68 N
W = -Wx *d =107.68 N *1.9 m= -204.6 J
(c) Work performed by normal force (N) exerted by the incline on the crate
The force N is perpendicular to the displacement, then:
W=0
(d) Total work done on the crate
W = 397.1 J -204.6 J
W = 192.5 J