A 3.00 kg toy falls from a height of 10.0 m. Just before hitting the ground, what will its kinetic energy be?
Answers
Answer:
294 J
Explanation:
To find the kinetic energy (KE) of a 3.00 kg toy falling from a height of 10.0 m, we'll use the kinetic energy formula: KE = 0.5 * m * v^2, where 'm' is the mass of the toy, and 'v' is its velocity.
We'll also apply the conservation of energy principle, which states that the total energy of an isolated system remains constant. This means that the gravitational potential energy (PE) of the toy at the initial height is equal to its kinetic energy just before hitting the ground.
The formula for gravitational potential energy is PE = m * g * h, where 'm' is the mass of the object, 'g' is the acceleration due to gravity, and 'h' is the height of the object.
So, we can equate these two expressions and solve for 'v':
0.5 * m * v^2 = m * g * h
v^2 = 2 * g * h
v = √(2 * g * h)
Plugging in the given values:
v = √(2 * 9.8 m/s² * 10.0 m)
v ≈ 14.0 m/s
Now that we have the velocity of the toy, we can calculate its kinetic energy using the KE formula:
KE = 0.5 * m * v^2
KE = 0.5 * 3.00 kg * (14.0 m/s)^2
KE ≈ 294 J
So, just before hitting the ground, the kinetic energy of the toy is approximately 294 joules.
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You run to your girlfriend's house and announce that you were running at a rate of 15 miles per hour. She knows this is not true because she knows
The acceleration of gravity is a constant equal to _______ meters per second squared.A. 9.8B. 8.4C. 10.2D. 7.6
Answers
Answer:
The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.
Answer:
Zero
Explanation:
The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.
A convex lens _____.
converges light
bulges in the middle
diverges light
is thinner in the middle
Answers
Answer:
Options C and the D are the correct answer.
Explanation:
There are two types of lenses: concave lenses and convex lenses. A convex lens is thinner in the middle. On the other hand, convex lenses are also called diverging lens because after the light passes through it, the ray light spreads out. Due to this, diverges light and is thinner in the middle are the correct answer.
Answers
take 56.9/1.137 = 50.043 mi/hr
take 189/211 = 0.896
24.8/2 = 12.4 m
12.4/82.3 = 0.15s
a lot of points, and your plea for help sounds so desperate, that I think
I ought to jump in here and relieve some of your pain.
These aren't difficult problems. The bummer is that whoever wrote them
got so interested in his dinosaur stories that he kind of hid the actual Math
and Physics under all kinds of stuff that doesn't matter.
1). Speed = (distance covered) / (time to cover the distance)
= (56.9 miles) / (68.2 minutes)
= (56.9 / 68.2) miles/minute
= 0.834 mile per minute.
BUT ... the question wants to know the speed in 'mph' ... miles per hour.
Well ... there are 60 minutes in an hour. If 0.834 mile in covered in 1 minute,
then 60 times as much would be covered in 1 hour.
(0.834 mile/minute) x (60 minute/hour) = 50.06 mile/hour
Rounded to no decimal places = 50 mph
2). Use the same formula:
Speed = (distance covered) / (time to cover the distance)
= (189 meters) / (211 seconds)
= (189 / 211) meters/seconds
= 0.8957 meters/second
Round to 3 decimal places: 0.896 m/s
3). The attacker jumped from 24.8 meters away.
He already covered half of the distance.
How far away is he now ? 1/2 of 24.8 m = 12.4 m .
He still has 12.4 meters left to go.
He's moving at 82.3 meters per second.
When will he arrive here ?
Time = (distance) / (speed)
= (12.4 meters) / (82.3 m/s)
= (12.4 / 82.3) seconds
= 0.1506 second
Two decimal places: 0.15 second
4). Distance = (speed) x (time)
= ( 237 km/hr) x (16.8 seconds) .
Do you see the problem here ? We have the distance covered in an hour,
but we need to know how much distance is covered in only 16.8 seconds.
We really need to work out the speed in (meters per second).
OK. 237 km = 237,000 meters, so the speed is 237,000 meters/hour.
1 hour is 3,600 seconds.
So the speed is only one 3600th of 237,000 meters in 1 second.
(237,000 meters/hour) x (1 hour / 3600 seconds) = 65.8333 m/s
Distance = (speed) x (time)
= (65.8333 meter/second) x (16.8 seconds)
= (65.8333 x 16.8) meters
= 1106 meters.
5). This is a nasty trick question. The whole story is irrelevant,
and we don't even care how far Vinny dropped.
Anything that drops on Earth falls with the acceleration of gravity.
It doesn't matter how big or heavy or small or light it is.
Everything falls with the acceleration of gravity on Earth ... about 9.8 m/s² .
Answers
Explanation:
Given that,
The density of water is 1 g/cm³
The density of ethanol is 0.8 g/cm³
We need to find the volume of the ethanol that has the same mass as 100 cm³ of water.
Density=mass/volume
For water,
For ethanol,
Hence, 125 cm³ of ethanol has the same mass as 100 cm³ of water.
Answer:
1.00 g/cm3
Explanation:
Answers
Answer:
Q = I t = 5.00E-8 C/s * 5.0 s = 2.5E-7 C total charge due to 50 μC for 5 sec
6.242E18 electrons / C * 2.5E-7 C = 1.6E12 electrons
Answers
Answer:
The darker the object, the better it emits heat, because it's a better absorber of light. On the other hand, a white object appears white because it reflects all the different wavelengths and absorbs little to no light. It doesn't absorb much energy, then, and puts off little to no heat.
Explanation: