What is the potential of a 35kg child sitting at the top of a slide that is 3.5m above the ground? What is her kinetic energy if she moves down the slide at a speed of 5.0m/s??
Answers
= (35)(9.8)(3.5)
= 1200.5 J
Ek = (1/2)(mv^2)
= (0.5)(35)(5^2)
= 437.5 J
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a boy on a bicycle is resting at the top of a hill then he rides his bicycle down the hill describe how the boy potential and kineti energy differ at the top middle and bottom of the him
Which of the following is a form of mechanical energy?a. internal energy c. gravitational potential energy b. chemical potential energy d. electrical energy
Answers
Answer:
Explanation:
i was always interested in certain biomechanics, how things lived and what worked for them to stay alive, but more specifically how organisms grow. i can also apply to this to industrial engineering. The parts in a machine for it do its job, and how they have to be not just accurate, but precise every time; The amount of calculation and careful precison for it to be effective. i would love to understand in general why things work the way they do.
b) 150kPA
c) 170kPA
d) 250kPA
give reasons
Answers
A fixed mass of gas has a volume of 25 , the pressure of the gas is 100 kPa, the volume of the gas is slowly decreased by 15
at a constant temperature, and the change in pressure of the gas is 150 kPa, which is option b.
What is the calculation of the change in pressure?
PV = nRT (P= pressure of the gas, V =volume, n = number of moles of gas, R = gas constant, and T =temperature of the gas in kelvin)
Suppose the gas is an ideal gas and that the temperature is constant,
P1V1 = P2V2
Here P1 = 100 kPa, V1 = 25 , V2 = 10
,
100 kPa x 25 = P2 x 10
P2 = (100 kPa x 25 ) / 10
P2 = 250 kPa
the change in pressure of the gas is,
ΔP = P2 - P1 = 250 kPa - 100 kPa = 150 kPa
The reason is that when the volume of a fixed mass of gas is decreased, the pressure of the gas increases proportionally, so here assuming that the temperature is constant it is calculated.
Hence, the volume of the gas is slowly decreased by 15 at a constant temperature, and the change in pressure of the gas is 150 kPa, which is option b.
Learn more about the calculation of the change in pressure here.
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Answers
Answer:
a)40.77N
b)0.11seg
Explanation:
The bullet has a kinetic energy:
When the bullet stops this energy goes to zero, as the energy must be conserved the work done by the head of the superhero must be equal to the original energy of the bullet:
Considering an average constant force, the work can be calculated as:
Solving for F:
The acceleration(on the opposite direction of motion) on the bullet will be:
The velocity of the bullet considering a constant acceleration can be calculate as:
It stops moving when V=0 so:
Answer:
a) 23444.3 N
b) 0.191 ms
Explanation:
Given:
Mass of the bullet m = 7.8 g = 7.8 * 10⁻³ Kg
Initial speed u = 575 m/s
Final speed v = 0
Distance covered s = 5.50 cm = 0.055 m
(a)
According to work energy theorem
Work done W = Change in Kinetic energy
hence, force*distance = 1/2*mass*velocity²
that is, F*S = (1/2)mu²
F*0.055 = 0.5 * 7.8 * 10⁻³ * (575)^2
F = 23444.3 N
(2)
From Impulse definition
force*time = change in momentum
where momentum = mass * velocity
F*t = Change in momentum = m* u
23444.3t = 7.8*10⁻³ * 575
Time, t = 0.191 ms
Answers
Rover has celebrated his first landing anniversary yesterday (Martian year, that is 687 Earth days).
Curiosity managed to find traces of water on Mars, so it's possible that there used to be some life on Mars.
Since landing Curiosity moved only about 5 miles form the landing site (it suffered wheel damage).
Which of the following is a true statement about light?
Light cannot be wave and a particle.
Light travels at the same speed as a really loud sound.
Light waves must have a medium in which to transfer energy
Light travels at 3.0 x 108 m/s in a vacuum.
Answers
Answer:
Light travels at 3.0 x 108 m/s in a vacuum.
Explanation:
Light travels at 3.0 x 108 m/s in a vacuum.
a. The clay is less dense when stretched into the shape of a boat.
b. The buoyant force is greater on the clay when it has a spherical shape.
c. The boat shape displaces a greater volume of water than the ball shape.
d. The weight of the clay boat is less than the weight of the clay ball.
Answers
In such situations, the point that we should take as a basis to resolve a question is weight. If the weight of clay is less than that of a clay ball, the clay will float.
Answer:
c. The boat shape displaces a greater volume of water than the ball shape.
Explanation: