A body is moving parallel to the z-axes. Its velocity is constant and equal to 12 m/s. Which vector of velocity is possible:
The velocity of the body is
. What is the position vector for this body (in general form)?
A body moves along the y-axes. When the velocity is positive? (more than one answer can be right)
Velocity of a body depends on time by the following form . What is the unit of the coefficient [b]?
The SI unit of density is?
[kg/m^3]
Every action or force upon an object must have an equal and ____________ reaction.
Opposite
A baseball of mass m is thrown upward with some initial speed. A gravitational force is exerted on the ball
At all points in its motion
The kinetic friction will always be
Less than static friction
The unit of coefficient of friction in SI system is
No unit
Whenever a constant force is applied on a body then it will move with __________.
Constant Acceleration
Power is a __________.
Scalar Quantity
The dot product of force and velocity is called __________.
Power
When the force and displacement are perpendicular to each other, then work is __________.
zero
Centripetal acceleration and tangential acceleration are always __________.
Perpendicular to each other
The dimensions of angular momentum are __________.
ML2T-1
The moment of inertia of a wheel about its axle does not depend upon its:
speed of rotation
Two waves have the same frequency. Which wave characteristic must also be identical for both waves?
Period
A mechanical wave generally does NOT
move the medium from one place to another
The moment of inertia of a body depends on
the mass distribution
A skater can spin faster by pulling in her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
Conservation of angular momentum
The Coulomb’s law ia an equation giving the magnitude of the electric force (sometimes called the Coulomb force) between two point charges:
The SI units for Coulomb constant ke are:
N·m2/C2
electric field vector E can be expressed as:
E=Fe/q
Which statements are correct?
Charges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is conserved. Charge is quantized.
Which statements are correct?
Conductors are materials in which electrons move freely. Insulators are materials in which electrons do not move freely.
If the electric field is uniform and makes an angle θ with the normal to a surface of area a, the electric flux through the surface is:
ΦE=EAcosθ
Gauss’s law says that the net electric flux ΦE through any closed gaussian surface is equal to:
ΦE=qin/ε0
A conductor in electrostatic equilibrium has the following properties:
1. The electric field is zero everywhere inside the conductor. 2. Any net charge on the conductor resides entirely on its surface. 3. The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4. On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the smallest.
When a positive test charge q0 is moved between points A and B in an electric field E, the change in the potential energy of the charge–field system is:
The potential difference ∆V between points A and B in an electric field E is defined as:
The potential difference between two points A and B in a uniform electric field E, where s (d=|s|) is a vector that points from A to B and is parallel to E is:
∆V=-Ed
Which statements are correct?
An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
If we define V = 0 at rA = ∞ the electric potential due to a point charge at any distance r from the charge is:
The potential energy associated with a pair of point charges separated by a distance r12 is:
The electric potential due to a continuous charge distribution is:
The capacitance C of any capacitor is the ratio of the charge Q on either conductor to the potential difference ∆V between them:
The SI unit of capacitance is:
C/V
The equivalent capacitance of a parallel combination of capacitors is:
Ceq=C1+C2+C3+...