(and no it doesn't give any options, it can be any device you can think of that uses a Convex lense)
Answer:
Explanation:
Convex lens is the lens which is used to converge the rays of light after refraction.
When the rays of light are coming parallel to the principal axis then after refraction they goes from the focus.
It is used as rear view mirror in automobiles. In this case it pelroduces small and erect image of faroff objects.
It is used in spectacles using for hypermetropia.
It is used in microscopes and telescopes.
Our eye also have a convex lens which forms images on retina.
Waves that move matter back and forth are called a.transverse waves b.longitudinal wave c. Medium wave
Answer:
When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.
Explanation:
Explanation:
When there is no change in chemical composition of a substance then it is known as physical change.
When we say that mass is conserved during a physical change then it means that total mass of the substance or object will remain the same from beginning till the end.
For example, a metal box of mass 20 grams is beaten with hammer. Its shape will change which is a physical change and after beaten with the hammer its mass still remains 20 grams.
Answer:
32.5 m/s
Explanation:
Given:
Δy = 50 m
a = -10 m/s²
t = 2.5 s
Find: v₀
Δy = v₀ t + ½ at²
(50 m) = v₀ (2.5 s) + ½ (-10 m/s²) (2.5 s)²
v₀ = 32.5 m/s
Answer: The entangled players would move with a speed of 0.2 m/s in the direction direction of the motion of second soccer player.
Explanation:
From law of conservation of momentum,
Initial momentum of the closed system = final momentum of the closed system
Since, no external force is acting on the players, total momentum would be conserved.
m₁u₁+m₂u₂=(m₁+m₂)v
where, m₁ is the mass of one soccer player = 40 kg
u₁ is its initial velocity before collision = 4 m/s
m₂ is the mass of the other soccer player = 60 kg
u₂ is the initial velocity before collision = - 3 m/s (∵opposite direction)
After collision, the two players get entangled and hence move with the same final velocity v.
40 kg × 4 m/s - 60 kg × 3 m/s = (40 kg + 60 kg ) v
160 kg m/s - 180 kg m/s = 100 kg v
v = -0.2 m/s
Hence, the entangled players would move with a speed of 0.2 m/s in the direction direction of the motion of second soccer player.