Tema
Q:
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
Q:
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
Q:
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.
Q:
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
Q:
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:
Q:
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
Q:
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
Q:
9 (1 point)
amount of potential energy a 40 kg rock sitting on a 70 m cliff is
Q:
The amount of potential energy a 3500 kg car has sitting in the driveway is
La cantidad de energia potencial que tiene un automóvil de 3500 kg en el camino de entrada es J
Q:
Si un peso de 30 kg se mueve a \( 5 \mathrm{~m} / \mathrm{s} \) con una fuerza de 15 N , el peso se moverá m
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