A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is above the ground. What is the mass of the box?
A) 8.9 kg
B) 5.3 kg
C) 6.7 kg
D) 8.0 kg
Question 2
Which of the following statements about spherical mirrors is correct? (There could be more than one correct choice.)
A) A concave mirror always produces a real image.
B) A convex mirror always produces a virtual image.
C) A concave mirror always produces a virtual image.
D) A convex mirror always produces a real image.
E) A convex mirror always produces an upright image.
Dicksonia antarctica, a species of tree fern
The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper
As some groups do ethnic work, they produce a mythical long-lost heritage, as in this photo of ...
These tree-sitters are being forcibly removed. They were protesting the environmental damage that ...
photosynthesis of a tree "التركيب الضوئي"
phylogenetic tree