🔭 physics

1. **State the problem:** We have the height of a javelin as a function of time $t$ given by $$h = -2t^2 + 9t + 11.$$ We need to find: (a) The time when the javelin hits the ground

1. The problem asks why we write $s(t) = 0$ in certain contexts. 2. Typically, $s(t)$ represents a position function depending on time $t$.

1. **State the problem:** A ball is thrown from a height of 64 feet. Its height above the ground after $t$ seconds is given by the function $$s(t) = -16t^2 + 64.$$ We need to find

1. Bola voli bermassa 240 g dilempar ke bawah dari ketinggian 10 m dengan kecepatan 2,5 m/s. Hitung energi kinetik pada ketinggian 3 m. 2. Andi menggunakan setrika dengan arus 2 A

1. **Problem:** A volleyball with mass 240 g is thrown downward from a height of 10 m with an initial velocity of 2.5 m/s. Given gravitational acceleration $g=10$ m/s², find the ki

1. **Stating the problem:** A volleyball with mass 240 g is thrown downward from a height of 10 m with an initial velocity of 2.5 m/s. Given gravitational acceleration $g = 10$ m/s

1. **State the problem:** Calculate how much charge passes through a smoke detector connected to a 9.0 V cell transferring energy at a rate of $1.0 \times 10^{-4}$ W in one day. 2.

1. **Nyatakan masalah:** Kita diminta untuk menentukan nilai $p$ dan $q$ pada graf jarak-masa perjalanan Sarah dari Melaka ke Klang. 2. **Maklumat diberikan:**

1. The problem asks to identify the stroke shown in the engine diagram with the piston moving upward, inlet valve on the left, and exhaust valve on the right. 2. The four strokes o

1. The problem asks: How long does it take to charge a battery to 15%? 2. To solve this, we need the total charging time for 100% and then calculate 15% of that time.

1. **Problem statement:** Three identical resistors $R_1$, $R_2$, and $R_3$, each with resistance $2\ \Omega$, are connected to a cell with negligible internal resistance. When swi

1. **Problem statement:** (a) Calculate the angular width of the second-order maximum for a diffraction grating with 400 lines/mm illuminated by light wavelengths from $4.00 \times

1. **Problem statement:** A small ball of mass 0.20 kg is attached to a string of length 0.80 m fixed at point S. The ball is released from rest when the string is horizontal. We a

1. **Problem statement:** A particle moves in a straight line with velocity given by $$v(t) = 1 + e^{-t} \sin t$$ for $$0 \leq t \leq 2$$. (a) Find the velocity at $$t=2$$.

1. **State the problem:** We want to find the intensity $|B|^2$ of the emerging wave from a Fabry–Pérot interferometer, where the wave amplitude is given by $$B = A(1-r) \sum_{n=0}

1. **Problem statement:** We have a circuit with three lamps X, Y, and Z connected as shown. The emf of the cell is 20V with negligible internal resistance. The power dissipated by

1. Let's start by stating the problem: We want to understand why frequency equals a certain value or expression in a given context. 2. Frequency generally refers to the number of o

1. **Problem Statement:** A standing wave is formed in a pipe that is closed at one end and open at the other. The pipe length is $L$ and the speed of sound in the pipe is $V$. We

1. The problem asks whether the thermal conductivity formula can be used and why or why not. 2. The thermal conductivity formula is $$Q = -kA \frac{\Delta T}{L}$$ where:

1. **Problem 10:** A metal cube X of length $L$ is heated gaining thermal energy $Q$, causing a temperature rise of $\Delta T$. A second cube Y of length $2L$, made of the same mat

1. **Problem 27:** Light of wavelength $\lambda$ is incident on a slit of width $b$ forming a diffraction pattern with central maximum width $\theta$ radians, where $\theta = \frac