🔭 physics

1. **State the problem:** We want to find how much of a radioactive substance remains after 12 months if its half-life is 3 months and the initial amount is 50 grams. 2. **Formula

1. **Problem:** A metal sphere contains $3.5 \times 10^{16}$ excess electrons. Find the net charge of the sphere. 2. **Formula:** The charge of one electron is $e = -1.6 \times 10^

1. **Problem statement:** A stone is thrown vertically upward with an initial velocity of $40\,ms^{-1}$ near the surface of a planet where gravitational acceleration is $8\,ms^{-2}

1. Let's clarify the concept of moment (torque) about a point. 2. The moment of a force about a point is defined as the force multiplied by the perpendicular distance from the poin

1. **Problem:** Calculate the new total weight of the ship after adding 10,000 kg. Formula: $$W_{total} = W + W_{add}$$

1. **Problem:** Calculate the new total weight of the ship after adding 10,000 kg. Given:

1. **Problem statement:** A mini bus of mass 2500 kg traveling at 40 m/s collides head-on with a lorry of mass 3500 kg moving at 20 m/s. After collision, the lorry moves at 1.2 m/s

1. **State the problem:** A 5 kg block is pushed 3 m across a horizontal floor by a 25 N force at an angle of 30° above the horizontal. The coefficient of kinetic friction is 0.2.

1. Problem 1: Given $L=0.50$ m, $q_1 q_2=8.0 \times 10^{-9}$ C, and angle $6^\circ$, find the distance and the electric force $F_E$. 2. Formula: Coulomb's law for electric force is

1. **Problem statement:** Calculate the total power dissipated in the circuit with resistors $R_1=10\ \Omega$, $R_2=3\ \Omega$, $R_3=8\ \Omega$ and voltage sources $V_1=5\ V$, $V_2

1. مسئله را بیان می‌کنیم: طول سیم مسی A دو برابر طول سیم مسی B است و قطر مقطع سیم B نصف قطر مقطع سیم A است. می‌خواهیم نسبت مقاومت الکتریکی سیم B به سیم A را پیدا کنیم. 2. فرمول مقا

1. **Problem Statement:** We have a uniform magnetic field $B$ in the N-S vertical plane with an angle of dip $\rho$. We need to determine which of the given options about motional

1. **Problem statement:** A block of mass $m$ and charge $q$ is connected to a fixed point $O$ by an inextensible string on a horizontal table. An electric field $E$ is applied per

1. **Problem statement:** A block of mass $m$ and charge $q$ is connected to a fixed point $O$ by an inextensible string on a horizontal table. An electric field $E$ is applied per

1. The problem is to identify some of the easiest formulas for acceleration and velocity in physics. 2. The key formulas are:

1. **Problem Statement:** Given a combination circuit with total voltage $V_T=20$, total current $I_T=5$, and total resistance $R_T=4$, find the individual current, voltage, and re

1. **Problem Statement:** Prove that for an ideal resistor (R), the area (cm) is related to the resistance and other parameters given that 1 cm = 0.7 (units not specified).

1. **State the problem:** A 5 kg block is pushed 3 m across a horizontal floor by a 25 N force applied at an angle of 30° above the horizontal. The coefficient of kinetic friction

1. **State the problem:** A 5 kg block is pushed 3 m across a horizontal floor by a 25 N force applied at an angle of 30° above the horizontal. The coefficient of kinetic friction

1. المشكلة: لدينا ثلاث رسوم بيانية تمثل العلاقة بين الزمن (الزمن) والتعرض (التعرض) لمادة Fe2O3 في الهواء. 2. الهدف: تحديد أي من الرسوم البيانية الثلاثة تمثل مدة التعرض في الهواء لل

1. **Problem Statement:** Derive the dimensions of the following physical quantities: