Física preguntas y respuestas

1 The equation for a distance, \( s(\mathrm{~m}) \), travelled in time \( t(\mathrm{~s}) \) by an object starting \( w \) th an initial velocity \( u\left(\mathrm{~ms}^{-1}\right) \) and uniform acceleration \( a\left(\mathrm{~ms}^{-2}\right) \) is: \[ s:=u t+\frac{1}{2} a t^{2} \] The tasks are to: a) Plot a graph of distance ( s\( ) \mathrm{vs} \) time ( t\( ) \) for the first 10 s of motion if \( u=10 \mathrm{~ms}^{-1} \) and \( a=5 \mathrm{~ms}^{-2} \). b) Determine the gradient of the graph at \( t=2 \mathrm{~s} \) and \( t=6 \mathrm{~s} \)

1. Перемешение. Скорость и ускорение материальной точки. 2. Законы Ныютона. 3. Закон изменения и сохранения импульса. 4. Работа силы. Мошиость. Кинетическая энергия.

- (11.55) [ 6 marks] A turntable has rotational inertia \( I \) and is rotating with angular speed \( \omega \) about a frictionless vertical axis. A wad of clay with mass \( m \) is tossed onto the turntable and sticks a distance \( d \) from the rotation axis. The clay hits horizontally with its velocity \( v \rightarrow \) at right angles to the turntable's radius, and in the same direction as the turntable's rotation (see figure below). Find expressions for \( v \) that will result in (a) the turntable's angular speed dropping to half its initial value, (b) no change in the turntable's angular speed, and (c) the angular speed doubling.

If you double the volume of a constant amount of gas at a constant temperature, what happens to the pressure? The pressure quadruples. The pressure does not change. The pressure doubles. The pressure is one-half the initial pressure.

According to kinetic molecular theory, the particles that compose a gas: do not attract or repel each other have an average kinetic energy inversely proportional to the temperature in kelvins are packed closely together-nearly touching one another all of the above

Es el tiempo correspondiente para completar una longitud de onda y se representa con una \( T \).

Es el número de periodos de la onda en un segundo, se representa con una \( f \)

95. ถ้าต้องการยกท่อนเหล็กมวล 600 กิโลกรัม โดยใช้รอกพวงหกตัว สามตัวตาย สามตัวเลื่อน รอกแต่ละ ตัวมีมวล 45 กิโลกรัม จงคำนวณขนาดของแรงที่ใช้ดึงเพื่อยกท่อนเหล็กนั้นเป็นนิวตัน

A 120 V battery is connected to a \( 4.50 \mu \mathrm{~F} \) capacitor How much energy stored in the capacitor

A 900 kg safe is 2.2 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 58 cm .