An astronaut is standing on the surface of a planetary satellite that has a radius of 1.74 × 106 m and a mass of 7.35 × 1022 kg
An experiment is planned where a projectile needs to be launched straight up from the surface. What must be the minimum initial speed of the projectile so it will reach a height of 2.55 × 106 m above this satellite's surface?
(G = 6.67 × 10-11 N ? m2/kg2)
What will be an ideal response?
Answer: 1.83 km/s
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A 120-m long copper wire (resistivity 1.68 × 10-8 ??m) has resistance 6.0 ?. What is the diameter of the wire?
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.65 m E) 6.5 m
Dielectrics: A 15-?F capacitor is connected to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric, having a dielectric constant of 5.0, is inserted between the plates and completely fills the space between them.(a) What is the capacitance of the capacitor after the slab is inserted?(b) What is the potential difference across the capacitor with the dielectric inserted.
Fill in the blank(s) with the appropriate word(s).
What happens when a core's density exceeds that which electron degeneracy pressure can support?
a. The core collapses to a black hole. b. The core collapses to a neutron star. c. The core collapses to a white dwarf. d. The core collapses to a neutron star or a black hole.
A rectangular stack of lead bricks measures 2 m by 3 m by 4 m. The mass density of lead is 11,340 kilograms per cubic meter. What is the total mass of the stack of lead?