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Questions in physics

šŸ“ Answered - In a scenario where a thin metallic strip on a vernier caliper descends from the upper edge to the lower edge and makes constant contact with the surface of a beaker, the main scale displays a reading of 6.40 mm with a vernier constant of 1.1 mm, and the fourth vernier scale division aligns precisely with a main scale division. Determine the precise depth of the beaker, assuming there is no zero error.

šŸ“ Answered - An aluminum block of mass 12.00 kg is heated from 20 C to 118 C. If the specific heat of aluminum is $913 J-1 kg K -1$ then how much energy is required? A. 1073.688 kJ B. 64.640 kJ C. 7456.167 kJ D. 10.956 kJ

šŸ“ Answered - What does the wavelength of a wave measure? A. The width of the wave B. The speed of the wave C. The height of the wave D. The number of waves per second

šŸ“ Answered - Given the following: Main scale reading: 6.4 cm Vernier scale reading: [tex]4 \times 0.01 cm=0.04 cm[/tex] Vernier constant = 0.1 mm [tex]\begin{aligned} \text { TS } & =\text { MSR }+ \text { USR } \\ \text { TS } & =0.04 cm+6.4 cm \times \\ \text { TS } & =6.4 cm+0.04 \times 0.1 \\ & =6.4 cm+ \end{aligned}[/tex] What is the precise depth of the beaker, assuming there is no zero error?

šŸ“ Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

šŸ“ Answered - Which statement best describes how waves carry energy? A. Energy moves from one place to another through the wave. B. Energy increases as it moves through the wave. C. Energy is completely consumed by the beginning of the wave. D. Energy builds through the wave and is released at the end.

šŸ“ Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

šŸ“ Answered - Cosmology studies the universe as a whole and how it develops over time: The scale factor [tex]a(t)[/tex] describes the change of distance in the universe. The Hubble parameter [tex]H(t)=\dot{a}(t) / a(t)[/tex] (where the dot represents the rate of change with respect to time) describes the rate at which the universe expands, and was measured to be around [tex]72.6 km / s / Mpc[/tex] using the James Webb Space Telescope in 2024. The deceleration parameter [tex]q[/tex] describes the acceleration of the expansion: [tex]q=-\left(1+\frac{\dot{H}}{H^2}\right)[/tex] Assume a model with [tex]a(t)=\lambda \cdot t^\beta[/tex], where [tex] \lambda[/tex] and [tex]\beta[/tex] are real numbers. Knowing that the universe is around 13.7 billion years old, determine if the expansion is accelerating or decelerating.

šŸ“ Answered - What is $h$ called in the equation $E=\frac{h c}{\lambda}$? A. The speed of light B. Einstein's constant C. The EM constant D. Planck's constant

šŸ“ Answered - a) VĀ² b)Ā² 73. What is Transformer? a) Transformer is a device used to convert low alternating voltage to high alternating voltage b) Transformer is a device used to convert alternating current to direct current c) Transformer is a device used to convert low alternating current to a high alternating current d) Transformers are used only for low alternating voltage sens in the star Diffusion