🔭 physics

1. **State the problem:** A 130 kg block slides down an inclined plane with a coefficient of kinetic friction $\mu_k = 0.25$. We need to find (a) the net force on the block and (b)

1. The problem asks whether the force exerted by charge $q_1$ on charge $q_2$ is negative. 2. The force between two point charges is given by Coulomb's law:

1. **Problem Statement:** Determine the magnitude of the electrostatic force between the pairs of charges $Q_1$ and $Q_2$, $Q_1$ and $Q_3$, and $Q_2$ and $Q_3$ arranged in a triang

1. **Problem:** Determine the magnitude of the electrostatic force between the pairs of charges Q₁ and Q₂, Q₁ and Q₃, and Q₂ and Q₃ arranged in a triangle. 2. **Formula:** Coulomb'

1. The problem asks to identify which line on the distance-time graph shows the particle is not moving and to describe the motion of the particle from O to R. 2. In a distance-time

1. The problem involves understanding the given time intervals $\Delta t$ and average forces $F_{av}$. 2. We are given four time intervals: $\Delta t = 0.24$ s, $0.12$ s, $0.48$ s,

1. **Problem Statement:** We have an isosceles triangle ABC with $m(\angle B) = 120^\circ$ and side $AC = 12\sqrt{3}$ cm. Forces of magnitudes 6, 7, and $8\sqrt{3}$ newtons act alo

1. The problem is to solve a circuit math problem, but no specific circuit or values are given. 2. Circuit math typically involves using Ohm's Law: $$V = IR$$, where $V$ is voltage

1. The problem asks to draw the free body diagram (FBD) for question 3a. 2. A free body diagram is a graphical illustration used to visualize the applied forces, moments, and resul

1. **Problem Statement:** Greg launches a rocket straight up, and we have a table of its height $H(t)$ at various times $t$. We want to understand the rocket's motion using this da

1. The problem is to understand and apply the famous equation from physics: $E=mc^2$. 2. This equation states that energy ($E$) is equal to mass ($m$) multiplied by the speed of li

1. The problem is to explain Einstein's theory of relativity focusing on the famous formula. 2. The key formula in Einstein's special theory of relativity is $$E=mc^2$$.

1. **Problem Statement:** Juana and Diego pull a stubborn puppy with forces of 23 lb and 27 lb at angles 18° and 15°, respectively. Find the force the puppy exerts to hold them at

1. **State the problem:** We need to find the density given the mass and the dimensions of the volume. 2. **Formula:** Density $\rho$ is defined as mass divided by volume:

1. **Problem statement:** A monochromatic light beam of wavelength $\lambda = 594$ nm shines vertically on a wedge-shaped air film formed by two glass plates touching at the left e

1. **Problem statement:** Consider a two-lens system in a 4-f configuration with lenses of focal lengths $f_1$ and $f_2$ separated by $f_1 + f_2$. An object is placed at the front

1. The problem is to convert a speed from meters per second (m/s) to kilometers per hour (km/h). 2. The formula to convert m/s to km/h is:

1. The problem asks to explain how a mirage happens. 2. A mirage is an optical phenomenon caused by the refraction of light rays due to temperature gradients in the air.

1. The problem asks: What type of lenses are used in binoculars and why? 2. Binoculars use **convex lenses** (also called converging lenses) in their optical system.

1. **Problem statement:** A small lightbulb is suspended $d_1=450$ cm above the water surface, and the water depth is $d_2=180$ cm. The bottom is a perfect mirror. We want to find

1. **Problem statement:** Convert 212 m/s to km/h. 2. **Formula and explanation:** To convert meters per second (m/s) to kilometers per hour (km/h), use the conversion factor: