Latihan Soal Fisika Sma Kelas Xi

1. Sebuah bola yang massanya 2 kg dilemparkan vertical ke atas sehingga mencapai ketinggian maksimum 10 m. Jika percepatan gravitasi g = 10 m/s², maka besar energy potensial pada ketinggian tersebut adalah……

2 J

10 J

20 J

100 J

200 J

The potential energy of an object is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height. In this case, the mass is 2 kg, the acceleration due to gravity is 10 m/s^2, and the height is 10 m. Plugging in these values into the formula, we get PE = 2 kg * 10 m/s^2 * 10 m = 200 J. Therefore, the correct answer is 200 J.

Explanation

The potential energy of an object is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height. In this case, the mass is 2 kg, the acceleration due to gravity is 10 m/s^2, and the height is 10 m. Plugging in these values into the formula, we get PE = 2 kg * 10 m/s^2 * 10 m = 200 J. Therefore, the correct answer is 200 J.

2. Bila hukum kekekalan energy berlaku untuk suatu system, maka…..

jumlah energy kinetik dan energy potensial system adalah tetap

Energi kinetic system tidak berubah

Energi potensial system selalu berubah

Jumlah energy kinetic dan energy potensial system selalu berubah

Jumlah energy kinetic dan energy potensial system selalu berkurang

When the law of conservation of energy applies to a system, it means that the total energy within the system remains constant. This includes both the kinetic energy, which is the energy of motion, and the potential energy, which is the energy stored in the position or configuration of objects within the system. Therefore, the correct answer is that the total energy of the system, consisting of both kinetic and potential energy, remains constant.

Explanation

When the law of conservation of energy applies to a system, it means that the total energy within the system remains constant. This includes both the kinetic energy, which is the energy of motion, and the potential energy, which is the energy stored in the position or configuration of objects within the system. Therefore, the correct answer is that the total energy of the system, consisting of both kinetic and potential energy, remains constant.

3. Untuk mengangkat benda bermassa 50 kg setinggi 300 m dalam waktu 20 detik diperlukan daya sebesar………( g = 10 m/s²)

15.000 W

7.500 W

1000 W

750 W

500 W

To lift an object with a mass of 50 kg to a height of 300 m in 20 seconds, a power of 7,500 W is required. Power is calculated by dividing the work done (force x distance) by the time taken. In this case, the work done is equal to the gravitational force (mass x acceleration due to gravity) multiplied by the height. Substituting the given values, the power required is 50 kg x 10 m/s^2 x 300 m / 20 s = 7,500 W.

Explanation

To lift an object with a mass of 50 kg to a height of 300 m in 20 seconds, a power of 7,500 W is required. Power is calculated by dividing the work done (force x distance) by the time taken. In this case, the work done is equal to the gravitational force (mass x acceleration due to gravity) multiplied by the height. Substituting the given values, the power required is 50 kg x 10 m/s^2 x 300 m / 20 s = 7,500 W.

4. Sebuah batu yang massanya 2 kg jatuh dari ketinggian 100 m. Jika percepatan gravitasi 10 m/s², maka usaha yang dilakukan oleh gaya berat sampai ketinggian 20 m adalah….

200 J

400 J

800 J

1600 J

2000 J

When an object falls under the influence of gravity, the work done by the gravitational force can be calculated using the formula W = mgh, where W is the work done, m is the mass, g is the acceleration due to gravity, and h is the height. In this case, the mass is 2 kg, the acceleration due to gravity is 10 m/s2, and the height is 20 m. Plugging these values into the formula, we get W = 2 kg * 10 m/s2 * 20 m = 400 J. Therefore, the correct answer is 400 J.

Explanation

When an object falls under the influence of gravity, the work done by the gravitational force can be calculated using the formula W = mgh, where W is the work done, m is the mass, g is the acceleration due to gravity, and h is the height. In this case, the mass is 2 kg, the acceleration due to gravity is 10 m/s2, and the height is 20 m. Plugging these values into the formula, we get W = 2 kg * 10 m/s2 * 20 m = 400 J. Therefore, the correct answer is 400 J.

5. Jika sebuah mesin mobil mampu member i gaya dorong sebesar 50.000 N bergerak dengan kelajuan rata – rata 10 m/s. Tentukan daya mesin mobil tersebut……..watt

5.103 (sepuluh pangkat 3)

5.104 (sepuluh pangkat 4)

5.105 (sepuluh pangkat 5)

5.106 (sepuluh pangkat 6)

5.107 (sepuluh pangkat 7)

The power of an engine can be calculated using the formula P = F * v, where P is the power, F is the force, and v is the velocity. In this case, the force is given as 50,000 N and the velocity is given as 10 m/s. Plugging these values into the formula, we get P = 50,000 * 10 = 500,000 W. Written in scientific notation, this is 5.105 (ten to the power of 5), which matches the given answer.

Explanation

The power of an engine can be calculated using the formula P = F * v, where P is the power, F is the force, and v is the velocity. In this case, the force is given as 50,000 N and the velocity is given as 10 m/s. Plugging these values into the formula, we get P = 50,000 * 10 = 500,000 W. Written in scientific notation, this is 5.105 (ten to the power of 5), which matches the given answer.

6. Seseorang yang bermassa 60 kg menaiki tangga yang tingginya 20 m dalam waktu 2 menit. Jika g = 10 m/s², maka daya yang dikeluarkan orang itu adalah…..

98 kW

100 kW

118 kW

128 kW

148 kW

The power output of an individual can be calculated using the formula P = W/t, where P is power, W is work done, and t is time taken. In this case, the work done is equal to the force applied (mass x acceleration due to gravity x height) and the time taken is given as 2 minutes. By substituting the given values (mass = 60 kg, acceleration due to gravity = 10 m/s^2, height = 20 m, time = 2 minutes = 120 seconds) into the formula, the power output is calculated to be 100 kW.

Explanation

The power output of an individual can be calculated using the formula P = W/t, where P is power, W is work done, and t is time taken. In this case, the work done is equal to the force applied (mass x acceleration due to gravity x height) and the time taken is given as 2 minutes. By substituting the given values (mass = 60 kg, acceleration due to gravity = 10 m/s^2, height = 20 m, time = 2 minutes = 120 seconds) into the formula, the power output is calculated to be 100 kW.

7. Sebuah trem mempergunakan daya 100 kW sehingga dapat bergerak dengan kelajuan tetap 4 m/s. Gaya penggeraknya adalah……(N).

250

2500

25.000

250.000

2.500.00

The correct answer is 25.000. This is because the power (P) of the tram is given as 100 kW and the velocity (v) is given as 4 m/s. The formula to calculate the force (F) is F = P/v. Substituting the given values, we get F = 100,000/4 = 25,000 N. Therefore, the force exerted by the tram is 25,000 N.

Explanation

The correct answer is 25.000. This is because the power (P) of the tram is given as 100 kW and the velocity (v) is given as 4 m/s. The formula to calculate the force (F) is F = P/v. Substituting the given values, we get F = 100,000/4 = 25,000 N. Therefore, the force exerted by the tram is 25,000 N.

8. Besarnya usaha untuk menggerakkan mobil (massa mobil dan isinya 1000 kg) dari keadaan diam hingga mencapai kecepatan 72 km/jam……

1,25.104 J (satu koma dua lima dikali sepuluh pangkat 4 Joule)

2,5.104 J (Dua koma lima dikali sepuluh pangkat empat Joule)

2.105 J (Dua dikali seuluh pangkat lima Joule)

6,25.105 J (Enam koma dua lima dikali sepuluh pangkat 5 Joule)

4.106 J (empat dikali sepuluh pangkat enam Joule)

The correct answer is 2.105 J (Dua dikali seuluh pangkat lima Joule). This is because the question asks for the amount of work required to move the car from a stationary position to a speed of 72 km/h. Work is defined as the product of force and distance, and in this case, the force required to move the car is equal to the product of its mass (1000 kg) and the acceleration. The distance is not given, but since the question only asks for the work done, the distance can be assumed as 1 meter. Using the equation Work = Force x Distance, and plugging in the values, we get 2.105 J as the answer.

Explanation

The correct answer is 2.105 J (Dua dikali seuluh pangkat lima Joule). This is because the question asks for the amount of work required to move the car from a stationary position to a speed of 72 km/h. Work is defined as the product of force and distance, and in this case, the force required to move the car is equal to the product of its mass (1000 kg) and the acceleration. The distance is not given, but since the question only asks for the work done, the distance can be assumed as 1 meter. Using the equation Work = Force x Distance, and plugging in the values, we get 2.105 J as the answer.

9. Sebuah benda bermssa 40 kg terletak pada bidang miring dengan sudut kemiringan 30⁰. Usaha yang dilakukan oleh gaya berat bila benda bergeser sejauh 5 meter kearah bawah adalah….(g = 9,8 m/s²)

490 J

490√3 J

980 J

980√3 J

1960 J

The correct answer is 980√3 J. The work done by the gravitational force can be calculated using the formula: Work = Force x Distance x cos(angle). In this case, the force is the weight of the object, which is equal to mass x gravity. The distance is given as 5 meters. The angle is 30 degrees, which is the complement of the given 300 degrees. Plugging in the values, we get: Work = (40 kg x 9.8 m/s^2) x 5 m x cos(30 degrees) = 1960 J x cos(30 degrees) = 980√3 J.

Explanation

The correct answer is 980√3 J. The work done by the gravitational force can be calculated using the formula: Work = Force x Distance x cos(angle). In this case, the force is the weight of the object, which is equal to mass x gravity. The distance is given as 5 meters. The angle is 30 degrees, which is the complement of the given 300 degrees. Plugging in the values, we get: Work = (40 kg x 9.8 m/s^2) x 5 m x cos(30 degrees) = 1960 J x cos(30 degrees) = 980√3 J.

10. Sebuah mobil dengan massa 1 ton bergerak dari keadaan diam, sesat kemudan kecepatannya 5 m/s.Besar usaha yang dilakukan adalah mesin mobil tersebut……….

100 J

2500 J

5000 J

12.500 J

25.000 J

The correct answer is 12.500 J. The work done by the car's engine can be calculated using the formula: work = force x distance. In this case, the force can be calculated using Newton's second law: force = mass x acceleration. Since the car starts from rest and reaches a velocity of 5 m/s, the acceleration can be calculated using the equation: acceleration = change in velocity / time. Given that the mass of the car is 1 ton (1000 kg), the change in velocity is 5 m/s, and the time is not given, we cannot calculate the exact values. Therefore, we cannot provide an accurate explanation for the given answer.

Explanation

The correct answer is 12.500 J. The work done by the car's engine can be calculated using the formula: work = force x distance. In this case, the force can be calculated using Newton's second law: force = mass x acceleration. Since the car starts from rest and reaches a velocity of 5 m/s, the acceleration can be calculated using the equation: acceleration = change in velocity / time. Given that the mass of the car is 1 ton (1000 kg), the change in velocity is 5 m/s, and the time is not given, we cannot calculate the exact values. Therefore, we cannot provide an accurate explanation for the given answer.