Other Physics Answers

Take a refrigerator magnet. Hold it near the refrigerator but not touching its door. Feel the long-range magnetic interaction and make a report on how this happens.

 A) The rate of flow of thermal energy 𝑄 𝑡 in a material is given by; 𝑸 𝒕 = 𝑪𝑨𝑻 𝑿

Where: 𝐴 is the cross − sectional area of the material,

𝑇 is the temperature difference across the thickness of the material,

𝑋 is the thickness of material,

𝐶 is a constant. Determine the SI base units of �

 A) In a police speed trap a straight length 𝐴𝐵, where 𝐴𝐵 = 186 m, is kept under surveillance. An ambulance from Chreso University passes point 𝐴 at 26.5 ms −1 and accelerating at a constant rate of 1.5 ms−2 .

i) What is the speed of the ambulance when it passes point 𝐵?

ii) What is the time taken to cover this distance?

B) If the speed limit is 70 mph, determine whether the speed limit has been broken?

i) Based on the average speed over the whole distance or

ii) Based on its speed at the moment it passes C, mid-point of 𝐴𝐵. (Take 1 km = 0.622 miles)

A) A shopping trolley and its contents have a total mass of 42kg. the trolley is being pushed along a horizontal surface at a speed of 1.2ms−1 . When the trolley is released, it travels a distance of 1.9m before coming to rest. A ssuming that the total force opposing the motion of the trolley is constant.

(i) Calculate the deceleration of the trolley.

(ii) Show that the total force opposing the motion of the trolley is 16N

(iii) Using the answer in A (ii), calculate the power required to overcome the total force opposing the motion of the trolley at a speed of 1.2msm−1 .

B) A stone falls from rest, calculate the distances through which it has fallen at times 1, 2, 3, 4 seconds after being released. Show that the distances travelled during the 1 𝑠𝑡 , 2 𝑛𝑑 , 3 𝑟𝑑 and 4 𝑡ℎ second after being released are in the ratio 1: 3: 5: 7. Find the formula for the distance fallen in the 𝑛 𝑡ℎ second.

what is the resultant displacement if a man jogs 120m, east, and then walks 50m due south?

what is the resultant displacement if a man jogs 120m, east, and then walks 50m due south?

1. What is the range of the projectile launched horizontally at 25 m/s from the 18 m-high cliff edge as shown in the diagram? 

2. A ball rolls off a horizontal roof at 15 m/s. How far will the ball have fallen vertically when it reaches a speed of 24 m/s?

An airplane trip involves three legs, with two stopovers. The first leg is due East for 620 km; the second leg is Southeast (45°) for 440 km; and the third leg is at 53° South of West. for

550 km.

i) Draw a figure showing the journey.

ii) What is the plane's total displacement and direction?

A rectangular Shape has a 2.50 ± 0.05m length and a 1.4 ± 0.05m width.

i. Determine the Perimeter of this rectangle. State the final answer with its correct uncertainty, as well the correct mumber of significant figures.

ii. Determine the Area of this rectangle. State the final answer with its correct uncertainty, as well the correct number of significant figures. 

iii. If this rectangle had a height of 1.8 +0.02 m, calculate the Volume. State the final answer with its correct uncertainty, as well the correct number of significant

figures.