Física preguntas y respuestas

Which of the following energy forms is stored in any compressed or stretched object? aCuál de las siguientes formas de energia se almacena en cualquier objeto comprimido b c gravitational potential energy d donmechanical energy elastic potential energy

Which of the following energy forms is involved in a pencil falling from a desk? a de las siguientes formas de energía está involucrada en un lápiz que cae de un escritorio b kinetic energy c nonmechanical energy d gravitational potential energy

4. Un circuito consta de una fuerza electromotriz dada por \( E(t)=100 \) sen \( 200 t V \), una resistencia de \( 40 \Omega \), un inductor de \( 0,25 \mathrm{H} \) y un condensador de \( 40 \times 10^{-4} \) faradios, estando conectados en serie todos estos elementos. Si la corriente inicial es cero y la carga inicial en el condensador es 0,01 coulomb. Al hallar la corriente \( i(t) \) para \( t>0 \) nos da que es: a. \( i(t)=e^{-80 t}(-4,588 \operatorname{sen} 60 t-1,27 \cos 60 t)-1,247 \cos 200 t-1,331 \operatorname{sen} 200 t \) b. \( i(t)=e^{-80 t}(-4,588 \operatorname{sen} 60 t+1,27 \cos 60 t)+1,247 \cos 200 t-1,331 \operatorname{sen} 200 t \) c. \( i(t)=e^{-80 t}(-4,588 \operatorname{sen} 60 t+1,27 \cos 60 t)-1,247 \cos 200 t+1,331 \operatorname{sen} 200 t \) d. \( i(t)=e^{-80 t}(-4,588 \operatorname{sen} 60 t-1,27 \cos 60 t)+1,247 \cos 200 t-1,331 \operatorname{sen} 200 t \)

Which of the following energy forms is involved in winding a pocket watch? ¿Cuál de las siguientes formas de energía está involucrada en dar cuerda a un reloj de bolsillo? b enmechanical energy d electrical energy dravitational potential energy elastic potential energy

The main difference between kinetic energy and potential energy is that La principal diferencia entre la energia cinética y la energía potencial es que a kinetic energy involves position and potential energy involves motion c although both energies involve motion, only kinetic involves position d alnetic energy involves motion and potential energy involves position d although both energies involve position, only potential involves position

In a particular experiment, a radioactive samplehas its mass halved every 1.5 hours. After 6 hours from the start of the experiment, its mass is 300 grams, (i) Find the initial mass of the radioactive sample (ii) Calculate the mass of the radioactive sample. 24 hours after the start of the experiment. (iii) Yasir intends to end the experiment once the mass of the radioactive sample is 75 grams. Determine the duration of the experiment.

How could you increase the kinetic energy of a car? ¿Cómo podría aumentar la energía cinética de un automóvil? a make it go faster b increase its mass c slow it down d both a and b

Question 13 (1 point) The velocity of a rock right before it hits the ground falling from a 45 m cliff would be La velocidad de una roca justo antes de que golpee el suelo al caer desde un acantilado Blank 1:

Question 12 (1 point) A pool ball rools off a table which is 2 m high and hits the floor with a speed of \( 6 \mathrm{~m} / \mathrm{s} \). It was going Una bola de billar rueda desde una mesa de 2 m de altura y golpea el suelo con una velocidad de \( 6 \mathrm{~m} / \mathrm{s} \). Iba a m

ping from the building lands on an air mattress and depresses it 4 m and the spring constant of the mattress is \( 35 \mathrm{~N} / \mathrm{m} \), his elastic ly would be