Asked by kali
Which falling object will result in the least kinetic energy when it collides with the ground?
a
100 grams of water falling at 10 m/s
b
10 grams of water falling at 1 m/s
c
10 grams of dirt falling at 2 m/s
d
100 grams of dirt falling at 15 m/s
a
100 grams of water falling at 10 m/s
b
10 grams of water falling at 1 m/s
c
10 grams of dirt falling at 2 m/s
d
100 grams of dirt falling at 15 m/s
Answers
Answered by
miss frekel
Which falling object will result in the least kinetic energy when it collides with the ground?
*
1 point
100 grams of dirt falling at 15 m/s
10 grams of dirt falling at 2 m/s
100 grams of water falling at 10 m/s
10 grams of water falling at 1 m/s
*
1 point
100 grams of dirt falling at 15 m/s
10 grams of dirt falling at 2 m/s
100 grams of water falling at 10 m/s
10 grams of water falling at 1 m/s
Answered by
miss frekel
Four rivers have the same volume of water flow over time but fall from different heights to power hydroelectric dams. Which dam would provide the most hydroelectric power?
*
1 point
dam C: fall height of 135 feet
dam B: fall height of 75 feet
dam A: fall height of 175 feet
dam D: fall height of 100 feet
*
1 point
dam C: fall height of 135 feet
dam B: fall height of 75 feet
dam A: fall height of 175 feet
dam D: fall height of 100 feet
Answered by
miss frekel
whats the answer
Answered by
Bot
We can find the kinetic energy using the formula: KE = (1/2)mv^2
where KE is the kinetic energy, m is the mass, and v is the velocity.
a: KE = 0.5 * 100g * (10 m/s)^2 = 0.5 * 100 * 100 = 5000 J (joules)
b: KE = 0.5 * 10g * (1 m/s)^2 = 0.5 * 10 * 1 = 5 J
c: KE = 0.5 * 10g * (2 m/s)^2 = 0.5 * 10 * 4 = 20 J
d: KE = 0.5 * 100g * (15 m/s)^2 = 0.5 * 100 * 225 = 11250 J
The least kinetic energy is generated by option b, which is 10 grams of water falling at 1 m/s.
where KE is the kinetic energy, m is the mass, and v is the velocity.
a: KE = 0.5 * 100g * (10 m/s)^2 = 0.5 * 100 * 100 = 5000 J (joules)
b: KE = 0.5 * 10g * (1 m/s)^2 = 0.5 * 10 * 1 = 5 J
c: KE = 0.5 * 10g * (2 m/s)^2 = 0.5 * 10 * 4 = 20 J
d: KE = 0.5 * 100g * (15 m/s)^2 = 0.5 * 100 * 225 = 11250 J
The least kinetic energy is generated by option b, which is 10 grams of water falling at 1 m/s.
Answered by
Bot
The least kinetic energy will be generated by the option: 10 grams of water falling at 1 m/s.
Answered by
Bot
The hydroelectric power generated by a dam is given by the formula: P = ρghQ
where P is the power, ρ is the density of water, g is acceleration due to gravity, h is the fall height and Q is the volume flow rate.
Since all four rivers have the same volume flow rate, we can ignore the Q variable.
Let's assume the density of water is 1000 kg/m³ and acceleration due to gravity is 9.81 m/s²
a: P = 1000 * 9.81 * 175 = 1,725,750 W
b: P = 1000 * 9.81 * 75 = 735,525 W
c: P = 1000 * 9.81 * 135 = 1,328,925 W
d: P = 1000 * 9.81 * 100 = 981,000 W
Therefore, dam A with a fall height of 175 feet would provide the most hydroelectric power.
where P is the power, ρ is the density of water, g is acceleration due to gravity, h is the fall height and Q is the volume flow rate.
Since all four rivers have the same volume flow rate, we can ignore the Q variable.
Let's assume the density of water is 1000 kg/m³ and acceleration due to gravity is 9.81 m/s²
a: P = 1000 * 9.81 * 175 = 1,725,750 W
b: P = 1000 * 9.81 * 75 = 735,525 W
c: P = 1000 * 9.81 * 135 = 1,328,925 W
d: P = 1000 * 9.81 * 100 = 981,000 W
Therefore, dam A with a fall height of 175 feet would provide the most hydroelectric power.
Answered by
Bot
The answer is dam A: fall height of 175 feet would provide the most hydroelectric power.