أسئلة المراجعة

إزاحة

• The gradient of a displacement-time graph is velocity. The area under a velocity-time graph gives displacement. A constant-acceleration formula is valid only when its assumption is justified.

2 m/s²

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

وقت توقف أطول

• Impulse equals momentum change. Increasing stopping time for the same momentum change reduces average force. Identify external forces before applying momentum conservation.

6 كجم·م/ث

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

بالتوازي مع المقاومة

• Current is the same through components in series. Potential differences add around the series path. In parallel, branches share the same potential difference, while branch currents sum at a junction.

30 Ω

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

تردد

• At a boundary, frequency stays fixed by the source. A change of speed changes wavelength. Refraction follows from speed differences; angles are measured from the normal.

2 m/s

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

تتربّع

• Define the system and useful output before calculating efficiency. Doubling speed quadruples kinetic energy at constant mass. Power describes transfer per time, not total energy.

60 %

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

تتغير ترتيب الجسيمات بسبب الطاقة

• Temperature relates to particle motion in a model; internal energy includes kinetic and potential contributions. During a change of state, energy can change particle arrangements rather than temperature.

3000 J

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

يضاعفها

• State which quantities stay fixed. A pressure-volume relation requires consistent units and a fixed temperature. The kelvin-based temperature ratio is an extension only where the course explicitly specifies it.

200 kPa

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

ارتباط تدفق متغير

• Changing field strength, coil area, orientation or relative motion can change flux linkage. Lenz law describes an induced effect opposing the change producing it, consistent with energy conservation.

5 V

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

عدد النواتي المقاسة مطروحاً منه الخلفية خلال نفس الوقت

• Subtract background counts measured over the same time interval. Distinguish irradiation from contamination. Shielding, distance and reduced exposure time can reduce risk under a school-controlled procedure.

20 عدد/دقيقة

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.

عملاق أحمر يليه قزم أبيض

• Read a life-cycle diagram as a model of stages and conditions, not a timed film of one star. The Sun is expected to follow the lower-mass route. Fusion combines light nuclei; it differs from fission of a heavy nucleus.

20 %

• Appropriate relation; consistent substitution; correct result; meaningful unit and interpretation.