Two bullets of the same size, mass and horizontal velocity are fired at identical blocks, only one is made of steel and the other is made of rubber. The steel bullet has a perfectly inelastic collision with the block, while the rubber bullet has an elastic collision. Which bullet is more likely to knock over the block, or are both equally likely to do so? Justify your choice based on physics principles.
Answers
Answer and Explanation:
- Since we're discussing shots, the significant thing is the way the energy is changed over as there is deceleration of the bullet to a halt when it hits something.
- Kinetic Energy is relative to mass times speed squared, so in reality, the 2 cases given have practically indistinguishable Kinetic energy. The measure of energy is authoritative, so the two cases will do generally a similar harm given, obviously we look at situations when all the kinetic energy is spent.
- One contrast that will be effectively obvious is that the weapon in the case of heavy bullet will recoil more.
- One can consider energy assimilation as force times separation distance, and energy ingestion as a product of force and time.
- Henceforth, the heavier yet more slow bullet with a similar energy will venture to every part of a similar separation in the engrossing material, but since of bigger force, will take a more drawn out time doing it.
- It will along these lines, additionally, give a more noteworthy "kick" to the object that absorbs.
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Answers
Answer:
a)the ball will leave the bat at an angle of 61.3° .
b) the velocity at which it will hit the ground will be v = 27.1 m/s
Explanation:
Given,
v = 47.24 m
h = 0.42 m
t = 5.73 s
R = 130 m
a)We know that
R = v cosθ × t
cosθ =
θ = 61.3°
the ball will leave the bat at an angle of 61.3° .
b)Vx = v cos(θ) = 47.24 x cos 61.3 = 22.7 m/s
v = u + at
Vy = 47.24 x sin 61.3 - 9.81 x 5.73
= -14.8 m/s
v =
v =
v = 27.1 m/s
the velocity at which it will hit the ground will be v = 27.1 m/s
Answers
Answer:
hello your question is incomplete attached below is the missing circuit diagram
answer : 3 unique currents
Explanation:
From the circuit attached below it can be seen that there will be Three(3) unique currents flowing through this circuit and the Branches where this currents could differ is at the Three(3) resistors
b) +9.8 m/s^2 throughout
c) -9.8 m/s^2 throughout
d) zero throughout
e) +9.8 m/s^2, then momentarily zero, then -9.8 m/s^2
Answers
Because free-falling objects are accelerating downwards at a rate of 9.8 m/s/s
Answers
Answer:
1.57 kW
Explanation:
The rate of heat loss is given by:
q = Gm * Cp * (tfin - ti)
Where
q: rate of heat loss
Gm: mass flow
Cp: specific heat at constant pressure
The Cp of air is:
Cp = 1 kJ/(kg*K)
The mass flow is the volumetric flow divided by the specific volume
Gm = Gv / v
The volumetric flow is the air speed multiplied by the cruss section of the duct.
Gv = s * h * w (I name speed s because I have already used v)
The specific volume is obtained from the gas state equation:
p * v = R * T
60 C is 333 K
The gas constant for air is 287 J/(kg*K)
Then:
v = (R * T)/p
v = (287 * 333) / 100000 = 0.955 m^3/kg
Then, the mass flow is
Gm = s * h * w / v
And rthe heat loss is of:
q = s * h * w * Cp * (tfin - ti) / v
q = 5 * 0.25 * 0.2 * 1 * (54 - 60) / 0.955 = -1.57 kW (negative because it is a loss)
B. A pingpong ball rolling a 2 m/s
C. A bowling ball rolling at 1m/s
D. A car rolling at 5 m/s
Answers
Answer:
A. A tractor trailer rig moving at 2 m/s
Explanation:
Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.
In physics, Sir Isaac Newton's first law of motion is known as law of inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
The inertia of an object such as a tractor trailer rig is greatly dependent or influenced by its mass; the higher quantity of matter in a tractor trailer rig, the greater will be its tendency to continuously remain at rest.
Hence, the object that has more inertia is a tractor trailer rig moving at 2 m/s because it has more mass than all the other objects in the category. Also, the mass of an object is directly proportional to its inertia.
Answers
Answer:
Explanation:
Frequency( ν ) 4667 x 10³ Hz = 4.667 x 10⁶ Hz
Energy of one photon = hν [ h is plank's constant ]
= 6.6 x 10⁻³⁴ x 4.667 x 10⁶ = 30.8 x 10⁻²⁸ J
Power = 84 x 10³ J/s
No of photons emitted = Power / energy of one photon
= 84 x 10³ / 30.8 x 10⁻²⁸ =2.727 x 10³¹ per second .