Answer:
A.) 78.4 J for both
B.) 78.4 J for both
C.) 8.85 m/s for both
D.) 17.7 kgm/s
Explanation:
Given information:
Mass m = 2 kg
Distance d = 20 m
High h = 4 m
A.) Gravitational potential energy can be calculated by using the formula
P.E = mgh
P.E = 2 × 9.8 × 4
P.E = 78.4 J
Since the two objects are identical, the gravitational potential energy of the block for both a and b will be 78.4 J
B.) According to conservative energy,
Maximum P.E = Maximum K.E.
Therefore, the kinetic energy of the two blocks will be 78.4 J
C.) Since K.E = 1/2mv^2 = mgh
V = √(2gh)
Solve for velocity V by substituting g and h into the formula
V = √(2 × 9.8 × 4)
V = √78.4
V = 8.85 m/s
The velocities of both block will be 8.85 m/s
D.) Momentum is the product of mass and velocity. That is,
Momentum = MV
Substitute for m and V into the formula
Momentum = 2 × 8.85 = 17.7 kgm/s
Both block will have the same value since the ramp Is frictionless.
23. I think is. B.is suitable to be processed and used again
In
the 1980s, the campaign for homosexual rights received government support as Mel
Boozer, an openly gay running vice-presidency, gave a Democratic National
Convention speech at the same time Scotland legalized male to male sexual
behaviors. On 1981, the World Health Organization (WHO) removed homosexuality as
a mental illness.
<span>bullet In July, the Centers for Disease Control
reported that 26 cases of a very rare form of cancer, Kaposi's Sarcoma, was
found in young gay men. This was later recognized as being due to the presence
of AIDS.</span>
When a nucleus of Ra (Radium) decays, it emits an alpha particle and becomes a Rn (Radon) nucleus, as described in the (Fig. 1 – Alpha decay). In general, during alpha decay the atomic number (Z) is reduced by two units and the mass number (A), by four units.
Answer:
v = 10 m/s
Explanation:
Given,
Length of the vine, l = 36 m
Angle of inclination = 31.0◦ with the vertical
acceleration due to gravity = 9.81 m/s²
Using Conservation of energy
KE = PE
v = 10 m/s
Hence, the speed of the swing is equal to 10 m/s